Готові списки джерел за темами / Chelant

Добірка наукової літератури з теми "Chelant"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Chelant"

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Zhang, Yan Kun, Shuo Qi, and Hong Han Chen. "A Review of Remediation of Chromium Contaminated Soil by Washing with Chelants." Advanced Materials Research 838-841 (November 2013): 2625–29. http://dx.doi.org/10.4028/www.scientific.net/amr.838-841.2625.

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This paper reviews current progress and technologies of removal of chromium (Cr) from soil by washing with chelants. The applications of soil washing with chelants are noted;the major controlling factors in soil washing process are discussed; the mechanism of removal of Cr in soil using chelants is reviewed. Soil washing is one of the few permanent treatment alternatives to remove metal contaminants from soils. The chelant reagent has the most influence on washing effect.
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2

Jiang, Yong Li, Hai Juan Wang, Ping Ning, and Hong Bin Wang. "Efficiency and Effects of Chemical Chelants Leaching on Arsenical Gold Mine Pretreatment by Pteris vittata L. in Arsenical Gold Ore." Advanced Materials Research 183-185 (January 2011): 2303–7. http://dx.doi.org/10.4028/www.scientific.net/amr.183-185.2303.

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Using pot experiment, the total arsenic absorbed by Pteris vittata L.from gold roe collected from Guizhou Xingren gold mine was investigated. Arsenic extraction efficiency and effects by five kinds of chelants such as Ethylene diamine tetraacetic acid disodium salt (EDTA-Na2), citric acid (CA), ammonium dihydrogen phosphate (MAP), Sodium bisulfite (NaHSO3) and Sodium bicarbonate (NaHCO3) were assessed. Absorption of As was measured in the fronds and roots of Pteris vittata L.under pot trial condition in which the tested gold ore powder was leached by the above five chelants with the concentrations of 0, 0.05, 0.1 and 0.15 mol•L-1, respectively. The results show that most of the chosen chelants can largely improve the efficiency of arsenic absorption. The leaching efficiency of As in fronds was generally listed in the following order: MAP>EDTA-Na2>CA>NaHCO3>NaHSO3 under the average concentration．With the increase of chelant concentration the As was extracted more and more on MAP and NaHCO3 . The extracting content of As ranged from 5055ug/g to 5974ug/g for EDTA, from3273 ug/g to 4975 ug/g for CA, from 7482 ug/g to 9357 ug/g for MAP and from 3620 ug/g to 5284 ug/g for NaHSO3, from 3401 ug/g to 6378 ug/g for NaHCO3, respectively. The leaching efficiency of As in roots was generally listed in the following order: MAP> NaHCO3>NaHSO3>EDTA-Na2>CA under the average concentration．The extracting content of As ranged from 1862ug/g to 2627ug/g for EDTA, from1494 ug/g to 2347 ug/g for CA, from 2739 ug/g to 3896 ug/g for MAP and from 2064 ug/g to 3373 ug/g for NaHSO3, from 2316 ug/g to 2587 ug/g for NaHCO3, respectively. These results mentioned above show that available As in Guizhou xingren gold mine can be most leached by Pteris vittata L.with the above chelants, especially in MAP treatment. MAP was the best chelants among the four tested chelants, suggesting that it will be useful in chelant-induced phyto-remediation.
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3

Lapierre, L., R. Berry, and J. Bouchard. "The Effect of Magnesium Ions and Chelants on Peroxide Bleaching." Holzforschung 57, no. 6 (October 30, 2003): 627–33. http://dx.doi.org/10.1515/hf.2003.094.

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Summary We recently reported that during peroxide bleaching, magnesium is substantially more effective when in a complex form with either pulp or a chelant. We also speculated that different magnesium forms affected the catalytic activity of transition metals towards peroxide decomposition to different degrees. As oxygen-delignified pulps still containing lignin were used, it was impossible to separate the catalytic peroxide decomposition by transition metals from the peroxide reaction with lignin, and thus to determine where in the pulp-liquor system magnesium or chelants, or both, were deactivating transition metals. In this paper, we studied the peroxide decomposition kinetics with different modes of addition of the P-stage chemicals in the presence of fully-bleached kraft pulps which are virtually lignin-free, in alkaline filtrates, in P-stage filtrate and in water. We found that most of the peroxide decomposition occurring during a P-stage applied to chemical pulps takes place through interaction with transition metals in the pulp rather than with transition metals in the soluble bulk phase. We also concluded that in any component of a peroxide bleaching system, magnesium is extremely efficient at reducing the rate of peroxide decomposition, while a chelant becomes more valuable when complexing magnesium.
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Wang, Guiyin, Shirong Zhang, Ting Li, Xiaoxun Xu, Qinmei Zhong, Yue Chen, Ouping Deng, and Yun Li. "Application of response surface methodology for the optimization of lead removal from contaminated soil using chelants." RSC Advances 5, no. 71 (2015): 58010–18. http://dx.doi.org/10.1039/c5ra06977g.

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Nowack, Bernd, Rainer Schulin, and Brett H. Robinson. "Critical Assessment of Chelant-Enhanced Metal Phytoextraction." Environmental Science & Technology 40, no. 17 (September 2006): 5225–32. http://dx.doi.org/10.1021/es0604919.

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Li, Rui, Zhong Qiu Zhao, and Xiao Na Liu. "The Changes of Heavy Metals Solubility with Time under Different Chelants in Contaminated Soil." Advanced Materials Research 864-867 (December 2013): 283–88. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.283.

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Heavy metals contamination of soil is a widespread global problem. Chelants assisted phytoextraction has been proposed to improve the efficiency of phytoextraction. To study the effects of different chelants on the solubility of heavy metals with time, a batch of soil incubation experiment was conducted. EDTA, EDDS, AES and IDSA of 5 mmol·kg-1 were singly added to the contaminated soil with no chelants addition as control. After 7 days of incubation, the concentrations of water-soluble Pb, Zn, Cu and Cd increased significantly compared to the control. Pb was increased by 158.6, 3.9, 42.2 and 5.3 times respectively, Cu was increased by 45.0, 162.0, 40.0 and 53.6 times respectively, Zn was increased by 6.2, 5.6, 9.4 and 1.5 times respectively, and Cd was increased by 33.5, 3.3, 126.5 and 38.0 times respectively. The results showed that EDDS was more effective for Cu desorption, EDTA was more effective for Pb desorption, and AES was more effective for Zn and Cd desorption, IDSA was more effective for Cd desorption, which was our interesting findings. With the time increasing, the soluble metals with EDTA treatment was increased or not changed, while the water-soluble metals with EDDS, AES and IDSA treatments were decreased significantly. The underlying reason for the results may be the different chemical characteristics of the chelants. EDTA, a persistent chelant, can’t be degraded in the environment, while EDDS, AES and IDSA are biodegradable chelants which were degraded with time increasing and the metals were absorbed to the bulk soil again, resulting in water-soluble metals reduced.
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Peters, Robert W. "Chelant extraction of heavy metals from contaminated soils." Journal of Hazardous Materials 66, no. 1-2 (April 1999): 151–210. http://dx.doi.org/10.1016/s0304-3894(99)00010-2.

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Voglar, David, and Domen Lestan. "Chelant soil-washing technology for metal-contaminated soil." Environmental Technology 35, no. 11 (January 6, 2014): 1389–400. http://dx.doi.org/10.1080/09593330.2013.869265.

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9

Andra, Syam S., Dibyendu Sarkar, Sumathi K. M. Saminathan, and Rupali Datta. "Chelant-assisted Phytostabilization of Paint-contaminated Residential Sites." CLEAN - Soil, Air, Water 38, no. 9 (August 27, 2010): 803–11. http://dx.doi.org/10.1002/clen.200900218.

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10

Pugliese, Michela, Vito Biondi, Enrico Gugliandolo, Patrizia Licata, Alessio Filippo Peritore, Rosalia Crupi, and Annamaria Passantino. "D-Penicillamine: The State of the Art in Humans and in Dogs from a Pharmacological and Regulatory Perspective." Antibiotics 10, no. 6 (May 28, 2021): 648. http://dx.doi.org/10.3390/antibiotics10060648.

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Chelant agents are the mainstay of treatment in copper-associated hepatitis in humans, where D-penicillamine is the chelant agent of first choice. In veterinary medicine, the use of D-penicillamine has increased with the recent recognition of copper-associated hepatopathies that occur in several breeds of dogs. Although the different regulatory authorities in the world (United States Food and Drugs Administration—U.S. FDA, European Medicines Agency—EMEA, etc.) do not approve D-penicillamine for use in dogs, it has been used to treat copper-associated hepatitis in dogs since the 1970s, and is prescribed legally by veterinarians as an extra-label drug to treat this disease and alleviate suffering. The present study aims to: (a) address the pharmacological features; (b) outline the clinical scenario underlying the increased interest in D-penicillamine by overviewing the evolution of its main therapeutic goals in humans and dogs; and finally, (c) provide a discussion on its use and prescription in veterinary medicine from a regulatory perspective.
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Дисертації з теми "Chelant"

1

Couto, Renata Martinussi. "Estudo da marcação com lutécio-177 de derivados da bombesina e avaliação das propriedades biológicas." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/85/85131/tde-26062014-124931/.

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Têm sido estudadas novas modalidades para o diagnóstico e tratamento de câncer de próstata avançado baseado em peptídeos. Receptores para o peptídeo liberador de gastrina (GRPr) são superexpressos em vários tipos de células cancerígenas, incluindo câncer de mama e próstata. A bombesina é um análogo do peptídeo GRP de mamíferos que se liga com alta especificidade e afinidade a GRPr. Várias pesquisas têm sido realizadas para desenvolver e radiomarcar um análogo da bombesina com lutécio-177 com interesse para terapia de tumores pequenos ou metástases, devido às características físicas e viabilidade comercial do radionuclídeo. O objetivo deste trabalho foi estudar o processo de marcação e controle de qualidade de derivados da bombesina, usando como agente quelante DTPA e DOTA e espaçador aminoacídico Gly5, e realizar estudos de estabilidade e de biodistribuição de modo a avaliar o potencial de aplicação em estudos clínicos. Os estudos demonstraram que os análogos da bombesina estudados podem ser marcados com 177Lu com alto rendimento de marcação e alta atividade específica. Os estudos de estabilidade in vitro sugerem que os derivados DOTA-conjugados apresentam maior estabilidade que o DTPA-conjugados quando armazenados sob refrigeração e em soro humano. O coeficiente de partição do PG5N-DOTA-177Lu indicou maior lipofilicidade quando comparado com o derivado PG5M-DOTA-177Lu , porém sem influência sobre o clareamento sanguíneo ou captação hepática do composto. Os compostos DOTA-conjugados apresentam menor ligação às proteínas plasmáticas, corroborado pelo rápido clareamento sanguíneo observado nos estudos in vivo. Os estudos de biodistribuição com os compostos PG5M-DOTA-177Lu e PG5N-DOTA-177Lu mostraram o rápido clareamento sanguíneo dos compostos e excreção renal, e baixa captação óssea, indicando estabilidade in vivo dos derivados 177Lu-DOTA. O composto PG5M-DOTA-177Lu apresentou maior captação no pâncreas e intestinos, órgãos com maior porcentagem de receptores para bombesina. Entretanto, a ligação dos compostos às células tumorais (PC-3) in vitro foi similar para ambos os compostos.
New therapy modalities for the treatment of advanced prostate cancer based on peptide analogues are reviewed. It has been shown that gastrin releasing peptide receptors (GRPr) are overexpressed in various types of cancer cells including prostate and breast cancer. Bombesin is an analogue of the mammalian GRP that binds with high specificity and affinity to GRPr. Significant research efforts have been devoted to the design bombesin analogues labeled with 177Lu considering the excellent radiophysical properties and commercial availability of the radionuclide. The aim of this work was to study the labeling and the quality control of a bombesin analogues with Lu-177 using DOTA and DTPA as chelate group and an aminoacidic spacers Gly5 and study the stability and biodistribution properties in order to evaluate the potencial for clinical application. The studies showed that the bombesin analogs were labeled with 177Lu with high radiochemical yield and high specific activity. In vitro stability studies showed that DOTA-conjugated peptides were more stable than DTPA-conjugated, when stored under refrigeration or in human serum. The partition coefficient values showed that 177LuDOTA-PG5N was more lipophilic when compared with 177LuDOTA-PG5M but without influence on blood clearance and liver uptake. The DOTA-conjugated peptides presented low binding to plasma proteins, that contributes for fast blood clearance in vivo. Biodistribution studies of 177LuDOTA-PG5M and 177LuDOTA-PG5N, showed significant renal uptake, as a result of the urinary excretion and low bone uptake, that indicated the in vivo stability of the 177Lu-DOTA-complexes. The compound 177LuDOTA-PG5M showed higher uptake on pancreas and intestinses and these organs presents high density of BBN receptors. But the in vitro binding assays (PC-3 tumors cells) showed similar results for both compounds.
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Nelson, Allan Dale. "Polyploid evolution in Chelone (Scrophulariaceae) /." Full-text version available from OU Domain via ProQuest Digital Dissertations, 1995.

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3

Sun, Hongmei. "Factors that influence chelate cooperativity." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/6583/.

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4

Drius, Giacomo. "Chimica dei complessi di Ru(II) con leganti biomimetici chelanti." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/24362/.

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Le reazioni tra il complesso [Ru(H)2(CO)(PPh3)3] e varie molecole con attività biologica quali l’acido pirrolo 2−carbossilico, il 5−idrossi−L−triptofano (5−HTP), il 2−[(H−pirrol−2−il)metilene]amminofenolo e l’(L) asparagina sono state studiate con diverse condizioni (stechiometria, temperatura, durata, solvente e sorgente energetica), formando in modo selettivo preferenzialmente un singolo isomero. La scelta dei leganti è stata dettata non solo dalla biocompatibilità ma anche dalla possibilità di sintetizzare complessi con leganti chelanti del tipo O,O− e N,O−. I complessi sintetizzati sono stati caratterizzati con le consuete tecniche spettroscopiche (ESI−MS, IR, 1H, 13C, 31P NMR, con tecniche a temperatura variabile, nOe e bidimensionali eteronucleari) e attraverso calcoli (in vuoto e con effetto solvente) DFT. Due distinti leganti di 2−carbossil pirrolo sono stati coordinati simultaneamente al centro metallico di Ru(II) attraverso due reazioni consecutive e sintesi “one pot”. La perdita della natura acida del metallo dovuta alla coordinazione del primo legante ha determinato la necessità di condurre le reazioni per tempi più lunghi ed in condizioni più drastiche, al fine di legare un’ulteriore molecola intercettando così specie intermedie con leganti mono−coordinati o coordinati contemporaneamente in modo monoapto e diapto. L’acido pirrolo 2−carbossilico preferisce l’(O,O)−chelazione oppure con due carbossilati mono coordinati in presenza di una molecola di solvente, mentre la base di Schiff, il 5−HTP e la L−asparagina formano analoghe specie N,O− chelanti.
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Amantia, David. "Coordination chemistry of chelate-tethered nucleobases." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.417527.

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Lipps, Jochen P. "Neue H-Chelate mit dualer Fluoreszenz." [S.l. : s.n.], 2008. http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-58318.

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Lovejoy, Andrew P. "Studies and synthesis of gallium chelate complexes." Thesis, University of Kent, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.290531.

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Carvalho, Tatiana Boal Robalo Rosado de. "Da memória ao lugar." Master's thesis, Universidade de Lisboa, Faculdade de Arquitetura, 2019. http://hdl.handle.net/10400.5/19240.

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Dissertação de Mestrado Integrado em Arquitetura, com a especialização em Arquitetura apresentada na Faculdade de Arquitetura da Universidade de Lisboa para obtenção do grau de Mestre.
O convento de Chelas, situa-se no Vale de Chelas na zona oriental de Lisboa. É uma das mais antigas casas monásticas da cidade, tendo sido testemunho de variadas ocupações e usos diferenciados que imprimiram um caráter mutante ao longo dos anos. Encontra-se atualmente ocupado pelo Arquivo Geral do Exército, que mantém preservadas as suas dependências conventuais e industriais. O grande estado de degradação do Convento e o panorama de abandono do meio urbano, cria uma janela de oportunidade para reflexão acerca da sua reabilitação e perspetiva futura. Insere-se na discussão da importância da preservação do património religioso e industrial que se encontra ao longo do Vale de Chelas. É nesse sentido que se procura entender o papel que o Convento de Chelas e a sua cerca terão no futuro do Vale e a dinâmica que podem imprimir na sua envolvente. Assim, o objetivo do trabalho passa por analisar o objeto de estudo num enquadramento mais alargado e profundo, recorrendo a uma metodologia baseada na experiência humana no lugar, incidindo na individualidade e especificidade do Convento. Este conjunto conventual apresenta uma forte pretensão de se manter como parte integrante da paisagem do Vale que merece ser preservada. É nesse sentido, que se apresenta aqui, a proposta para uma intervenção fundamentada por uma leitura fenomenológica, que visa restituir um futuro a este conjunto conventual.
ABSTRACT: The Convent of Chelas is situated in the Chelas Valley in eastern Lisbon. It is one of the oldest monastics housed of the city, it has witnessed numerous occupations and different uses that gave a changing character throughout the years. It is currently occupied by the General Archives of the Army, maintaining its convent and industrial premises. The great state of degradation of the convent and the panorama of neglection of the urban environment characterized by void and ruins, gives a window opportunity to reflect on its rehabilitation and future perspective. It is part of the discussion on the importance of the preservation of the religious and industrial heritage that exists along the Chelas Valley. This is how one tries to understand the role that the Convent of Chelas and its fence will have in the valley and the consequent dynamics that will print in its surrounding. Thus, the objective of the project is to analyse the object of study in a broader and deeper context, using a methodology base on human experience in site, with focus on the individuality and specificity of the Convent. The Convent complex present a strong will to remain an integral part of the valley landscape that deserves to be preserved. Therefore, it is presented here, the proposal for an intervention based on a phenomenological reading, which aims to restore the future of this Convent.
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James, Daniel Stuart. "Novel nitrogen-sulfur chelate ligands for asymmetric catalysis." Thesis, University of Sheffield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287727.

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FREITAS, Eriberto Vagner de Souza. "Fitorremediação de solo contaminado por chumbo: efeitos de agentes quelantes sintéticos e naturais na dessorção,lixiviação e fitoextração." Universidade Federal Rural de Pernambuco, 2008. http://www.tede2.ufrpe.br:8080/tede2/handle/tede2/4949.

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Submitted by (lucia.rodrigues@ufrpe.br) on 2016-07-05T12:31:51Z No. of bitstreams: 1 Eriberto Vagner de Souza Freitas.pdf: 904280 bytes, checksum: d5c6015d942a8b46935c4c55349db678 (MD5)
Made available in DSpace on 2016-07-05T12:31:51Z (GMT). No. of bitstreams: 1 Eriberto Vagner de Souza Freitas.pdf: 904280 bytes, checksum: d5c6015d942a8b46935c4c55349db678 (MD5) Previous issue date: 2008-02-29
Synthetic chelates used in phytoextraction, barely degradate in soil and pose a risk owing metal leaching. Natural organic acids can be an alternative to synthetic chelates thanks to their rapid biodegrability. The study was carried out aiming at evaluating the performance of three synthetic chelators and two natural aliphatic acids in desorbing Pb from a soil contaminated through recycling of battery wastes. Additionally, effects of the amendments on the Pb leaching from soil were also studied. The work comprised two experiments: (1) Pb desorption from soil using the rates of 0, 2, 5, 10, 20 and 30 mmol kg-1 of citric acid and oxalic, EDTA, DTPA and NTA; (2) Pb leaching from soil columns by applying citric acid, oxalic, EDTA, and NTA onto soil at the 0, 10, and 20 mmol kg-1 concentrations. EDTA promoted the highest desorption and leaching, hence is not recommended for phytoextraction programs in the area. High desorption of Pb along with low leaching, qualifies NTA as a potential Pb phytoextraction enhancer for the metal in the field condition. Neither citric acid nor oxalic acid posed risk regarding Pb leaching. On the other hand, they seem little promising for enhancing Pb phytoextraction due to the lowmetal concentration in soil solution.
A baixa degrabilidade no solo de quelantes sintéticos usados para induzir a fitoextração pode significar elevado risco ambiental pela lixiviação de metais pesados. Agentes quelantes naturais, mais rapidamente degradados no solo, podem ser uma alternativa para os quelantes sintéticos. Os objetivos do trabalho foram avaliar a capacidade de cinco agentes quelantes sintéticos e dois naturais de cadeia alifática na dessorção de Pb, além do risco de lixiviação desse metal promovida pelos quelantes em solo contaminado pela deposição de escórias resultantes da reciclagem de baterias automotivas. O trabalho compreendeu dois experimentos: (1) dessorção utilizando as concentrações de 0, 2, 5, 10, 20 e 30 mmol kg-1 de ácido cítrico e oxálico, EDTA, DTPA e NTA; (2) lixiviação de Pb realizada em colunas de PVC com concentrações de 0, 10 e 20 mmol kg-1 de ácido cítrico e oxálico, EDTA e NTA. O uso do EDTA promoveu elevada dessorção e lixiviação de Pb, não sendo recomendado o uso para programa de fitoextração na área em estudo. A elevada dessorção de Pb, aliada a baixa lixiviação promovida pelo NTA, qualifica o quelante para programa de fitoextração de Pb na área a qual as amostras de solo foram coletadas. Os quelantes orgânicos não apresentaram riscos para a lixiviação de Pb nas concentrações estudadas, mas parecem pouco promissores para a fitoextração de chumbo devido a baixa dessorção do metal.
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Книги з теми "Chelant"

1

Cook, Billy K., and Raman K. Raman. Optimal chelant/copper ratios for maximizing copper solubility in natural water using citric acid and triethanolamine. Springfield, Ill: Illinois Dept. of Energy and Natural Resources, Energy and Environmental Affairs Division, 1986.

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2

Chelan. Mililani, Hawaii: Leobrand Books, 1996.

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3

Gregg, Kristen J. Lake Chelan Valley. Charleston, SC: Arcadia Pub., 2009.

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4

Gregg, Kristen J. Lake Chelan Valley. Charleston, SC: Arcadia Pub., 2009.

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5

Kendra, Will. Morphometry of Lake Chelan. Olympia, WA: Water Quality Investigations Section, Washington State Dept. of Ecology, 1987.

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6

1930-, Uță Chelaru Elena, ed. Elena Uță Chelaru. [Bucharest]: Ed. Meridiane, 1990.

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7

Chattopadhyay, Sharatchandra. Bindur chelay. Calcutta: Punoshcho, 1992.

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8

Safin, Mansur. Chelny moi bylinnye = May Chelny: Stikhotvorenii︠a︡, poėmy, pesni. Naberezhnye Chelny: Naberezhnochelninskai︠a︡ tip., 2007.

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9

Na utselevshem chelne. Moskva: Novyĭ khronograf, 2006.

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Boreson, Keo. The burials at 45CH296, Chelan County, Washington. Cheney, Wash: Archaeological and Historical Services, 1985.

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Частини книг з теми "Chelant"

1

Luo, Chunling, Xiangdong Li, and Zhenguo Shen. "Biodegradable Chelant-Assisted Phytoextraction." In Twenty Years of Research and Development on Soil Pollution and Remediation in China, 725–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6029-8_45.

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Komárek, Michael. "Roles of Metal-(Hydr)oxides in Chelant-Enhanced (Phyto)extraction." In Chelating Agents for Land Decontamination Technologies, 198–211. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412183.ch08.

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Tsang, Daniel C. W., Irene M. C. Lo, and Rao Y. Surampalli. "Design, Implementation, and Economic/Societal Considerations of Chelant-Enhanced Soil Washing." In Chelating Agents for Land Decontamination Technologies, 1–26. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412183.ch01.

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Polettini, Alessandra, and Raffaella Pomi. "Remediation of Metal-Contaminated Sediments by Means of Chelant-Assisted Washing." In Chelating Agents for Land Decontamination Technologies, 27–58. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412183.ch02.

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Chen, Yahua, Xiangdong Li, and Zhenguo Shen. "Chelant-Enhanced Phytoextraction of Heavy Metal-Contaminated Soils and Its Environmental Risk Assessment." In Twenty Years of Research and Development on Soil Pollution and Remediation in China, 509–33. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-6029-8_31.

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Zhang, Weihua, and Rongliang Qiu. "Operational Conditions of Chelant-Enhanced Soil Washing for Remediation of Metal-Contaminated Soil." In Chelating Agents for Land Decontamination Technologies, 59–91. Reston, VA: American Society of Civil Engineers, 2012. http://dx.doi.org/10.1061/9780784412183.ch03.

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Gooch, Jan W. "Chelate." In Encyclopedic Dictionary of Polymers, 136. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2238.

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Fiedler, H. "Chelate." In Springer Reference Medizin, 560. Berlin, Heidelberg: Springer Berlin Heidelberg, 2019. http://dx.doi.org/10.1007/978-3-662-48986-4_711.

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Fiedler, H. "Chelate." In Lexikon der Medizinischen Laboratoriumsdiagnostik, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-49054-9_711-1.

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Gooch, Jan W. "Aluminum Chelate." In Encyclopedic Dictionary of Polymers, 31. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_500.

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Тези доповідей конференцій з теми "Chelant"

1

Jordan, Myles M., Helen Williams, Sandra Linares-Samaniego, and Dario M. Frigo. "New Insights on the Impact of High Temperature Conditions (176°C) on Carbonate and Sulphate Scale Dissolver Performance." In SPE International Oilfield Scale Conference and Exhibition. SPE, 2014. http://dx.doi.org/10.2118/spe-169785-ms.

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Abstract Scale-dissolver technology has been developed and applied with varying degrees of success over the past few years to remove carbonate and the more challenging sulphate/sulphide scales from production tubing and process equipment. It can often seem a much safer, more cost-effective remediation approach than physical removal, in particular, in the new generation of HP/HT fields, where any physical well intervention carries high risk, while the high temperatures would normally be beneficial in enhancing scale solubility and dissolution rate. The current paper reports dissolution characterstics of three solvents for calcite, barite, celestite and anhydrite in the temperature range 85°C to 176° to verify their performance up to the very high temperatures of a specific HP/HT development. These solvents included a typical alkaline-pH chelant for sulphate scale, an organic-acid mixture for carbonate scales, and a novel neutral-pH chelant as a less corrosive solvent for carbonate scale removal. In some tests the liquid-to-solid ratiowasvaried to evaluate the impact of excess scale on solvent performance. The performance against BaSO4 of the alkaline-pH chelant unexpectedly declines very significantly at 176°C relative to that observed at 85°C. Thermal instability was ruled out as the cause becausethe solvent showed very limited decline in performance when tested at 85°C after it had been thermally aged at 176°C. Performance at 176°C showed an initial rise followed by a decreasein aqueous barium ions, strongly indicating secondary re-precipitation of a barium-containing species at this temperature. In contrast, dissolution rates of carbonate scale by organic acid were greaterat the higher temperature, as would be expected. The novel neutral chelant showed a decline in calcite dissolution performance during the 176°C test but unlike the alkaline-pH chelant used for sulphate scale, this chelant showed degradation after thermal ageing and re-testing at 85°C. The findings from this paper suggest that there is temperature limit above which effective removal of sulphate scales may not be feasible with the selected solvents due to re-precipitation of a secondary reaction product, while for carbonate removal the current neutral chelants tested have a thermal stability issue at 176°C. These findings need to be considered when evaluating the potential role of chemical remediation in the overall scale-control strategy for HP/HT fields.
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El-Kady, Ahmed Hamdy, Zheng Chai, and Hisham A. Nasr-El-Din. "Comparative Analysis of Aminopolycarboxylate Chelants Improves Iron Control in Acidizing Operations." In SPE International Conference on Oilfield Chemistry. SPE, 2021. http://dx.doi.org/10.2118/204322-ms.

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Abstract Aminopolycarboxylate-based chelants are used to control iron precipitation during acidizing operations by interacting directly with the iron, resulting in water-soluble complexes. This paper highlights that, in order to improve the effectiveness of iron control during acidizing operations, the type and the concentration of the chelants should be based on the formation properties and the well characteristics by comparing the cheltors’ performance as iron-control agents at different temperatures and pH environments with different levels of iron concentrations and chelant to iron molar ratios in acid (HCl). This study also addresses the interactions between the tested iron-control additives and acid, as well as the performance of the chelants in carbonate cores. Laboratory experiments were conducted to investigate the performance of nitrilotriacetic acid (NTA), glutamic acid, N, N-diacetic acid (GLDA), diethylenetriaminepentaacetic acid (DTPA), ethylenediamine-tetraacetic acid (EDTA), and hydroxyethylethylenediaminetriacetic acid (HEDTA) as iron control additives in 5 wt% HCl at pH values 0 to 4.5 to simulate carbonate acidizing at temperatures of 70 to 300°F, and initial iron concentrations of 2000 ppm. The performance of NTA and EDTA was also compared at higher initial iron concentration (4000 ppm). This work also quantified the effects of acid additives such as corrosion inhibitor and non-ionic surfactant on the chelation performance. Coreflood experiments using carbonate cores in acid with chelant helped determine its influence on permeability. Testing chelant-to-acid molar ratios of 1:1, 1.1:1, 1.2:1, 1.3:1, 1.4:1, 1.5:1, and 2:1 relative to iron concentration yielded optimal values. Additional tests monitored iron precipitation in solution using an inductively coupled argon plasma (ICAP) emission spectroscopy. Precipitates were filtered and analyzed using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS). Without chelant, at 70°F and 2000 ppm initial iron concentration, precipitation began at pH 1.45 and completed by pH 2.42. At 150 and 210°F, iron precipitated at pH 0.68 and 0.3 and completed by pH 1.3 and 1, respectively. At 70°F, NTA showed a minimum of 98% chelation at pH 4.3; however, its performance declined at 150°F to 74% chelation at pH 4.24, and at 210°F to 53% chelation at pH 4.0. Although DTPA dissolves completely in live acid, precipitations occurred at partially spent acid. At pH 0.15, SEM-EDS showed that the precipitate contains as much as 13 wt% iron. Thus, DTPA is not a suitable iron-control agent. HEDTA showed a 90% chelation at 210°F and pH 4.8. GLDA's performance declined to less than 50% at 150°F. At higher iron concentrations of 4000 ppm, Na3NTA kept all iron in solution in a 5 wt% HCl up to pH 4.0 at 70°F and its performance declined to a minimum of 97% at pH 4.7 at same temperature. At 150°F, and 210°F, Na3NTA started to gradually decline at pH values greater than 3.9, and 3.5, respectively. The minimum chelation reached by NTA was 91% at pH 4.4, at 150°F, and 73% at pH 4 at 210°F. Upon comparing the NTA's results at high iron concentrations to the popular EDTA, Na4EDTA at 1-to-1 mole ratio with iron exceeded its maximum solubility in 5 wt% HCl and precipitated in the original solution. For NTA, a molar ratio of 1.4:1 is optimal at 70 and 150°F, showing chelation performance of 95% and 94%, respectively, while a molar ratio of 1.5:1 is optimal at 210°F, showing a chelation performance of 87%. This study's results improve field operations by identifying NTA and HEDTA as having the best iron-control chelation performance of the five additives tested, thus reducing guesswork and streamlining production. The work also provided recommendations for choosing the best type of iron-control agent based on solubility and coreflood analysis. The results can be used to design more efficient acidizing fluids. This work won second place in the Masters division of the 2020 Gulf Coast Regional Student Paper Contest, April 2020.
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de Antuñano, Yuri, M. Losada, and A. Milne. "Stimulating High-Temperature Dolomitic Limestone Reservoirs with Chelant Fluids." In SPE European Formation Damage Conference and Exhibition. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/174167-ms.

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Beuterbaugh, Aaron M., Enrique A. Reyes, and Alyssa L. Smith. "Tandem Acidizing-Corrosion Inhibition with Low Risk-Low Toxicity Chelant." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/173740-ms.

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Todd, Malcolm John, Adam Justin Savin, and Kenneth Stuart Sorbie. "Dual Chelant Mechanism for the Deployment of Scale Inhibitors in Controlled Solubility/Precipitation Treatments." In SPE International Conference on Oilfield Scale. Society of Petroleum Engineers, 2012. http://dx.doi.org/10.2118/152870-ms.

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Lu, Yayin, Dinggui Luo, Guowei Liu, An Lai, and Jian Gong. "The Leaching Characteristics of Chelant-Enhanced Phytoextraction of Cd and Pb Contaminated Soil with Simulated Acid Rain." In 2016 International Conference on Civil, Transportation and Environment. Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/iccte-16.2016.170.

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Parkinson, Mark, Trevor Kenneth Munk, Jess G. Brookley, Agostinho Domingos Caetano, Marcos Antonio Albuquerque, David Cohen, and Michael Robert Reekie. "Stimulation of Multilayered High-Carbonate-Content Sandstone Formations in West Africa Using Chelant-Based Fluids and Mechanical Diversion." In SPE International Symposium and Exhibition on Formation Damage Control. Society of Petroleum Engineers, 2010. http://dx.doi.org/10.2118/128043-ms.

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Smith, Alyssa LaBlanc, Geok Cheen Woon, Ferry Smits, Kesavan Govinathan, Wei-Jin Yong, Aaron Beuterbaugh, and Enrique A. Reyes Garcia. "Field Results and Experimental Comparative Analysis of Sodium and Nonsodium Chelant-Based HF Acidizing Fluids for Sand Control Operations." In SPE International Conference and Exhibition on Formation Damage Control. Society of Petroleum Engineers, 2016. http://dx.doi.org/10.2118/179001-ms.

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Wibisono, Kunto R., Robert C. Burton, Richard M. Hodge, Juanita M. Cassidy, Rio Wijaya, and Bastiaan Nieuwland. "Openhole Clean-Up of Deep, High Temperature Horizontal Wells with a Chelant Based Acid System - Case Histories from Indonesia." In International Oil & Gas Conference and Exhibition in China. Society of Petroleum Engineers, 2006. http://dx.doi.org/10.2118/104119-ms.

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Pettitt-Schieber, Lucy, Francisco O. Garzon, Michael Aman, Pavel Gramin, and Lawrence Ramnath. "A Novel Deployment of Chelant and Mud Acid in a Deepwater Frac Packed Well to Remediate Severe Formation Damage." In SPE/ICoTA Well Intervention Conference and Exhibition. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/194236-ms.

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Звіти організацій з теми "Chelant"

1

Brewster, M. D., R. W. Peters, G. A. Miller, T. L. Patton, and L. E. Martino. Chelant extraction and REDOX manipulation for mobilization of heavy metals from contaminated soils. Office of Scientific and Technical Information (OSTI), December 1994. http://dx.doi.org/10.2172/10104624.

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2

Brennecke, Joan F., Mark A. Stadtherr, and John E. Chateauneuf. Spectroscopy, Modeling and Computation of Metal Chelate Solubility in Supercritical CO2. Office of Scientific and Technical Information (OSTI), June 2000. http://dx.doi.org/10.2172/827271.

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3

Carroll, Valerie, Don Wycoff, Gary Sieckman, Fabio Gallizzi, Timothy Hoffman, and Silvia Jurisson. Development of a Tetrathioether (S4) Bifunctional Chelate System for Rh-105. Fort Belvoir, VA: Defense Technical Information Center, July 2013. http://dx.doi.org/10.21236/ada581448.

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J. F. Brennecke and M. A. Stadtherr. Spectroscopy, modeling and computation of metal chelate solubility in supercritical CO{sub 2}. Office of Scientific and Technical Information (OSTI), December 1999. http://dx.doi.org/10.2172/750972.

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Carroll, Matthew S., Angela J. Findley, Keith A. Blatner, Sandra Rodriguez Mendez, Steven E. Daniels, and Gregg B. Walker. Social assessment for the Wenatchee National Forest wildfires of 1994: targeted analysis for the Leavenworth, Entiat, and Chelan Ranger Districts. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station, 2000. http://dx.doi.org/10.2737/pnw-gtr-479.

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Watkins, B. E., and J. H. Satcher. The synthesis and characterization of new iron coordination complexes utilizing an asymmetric coordinating chelate ligand. Office of Scientific and Technical Information (OSTI), March 1995. http://dx.doi.org/10.2172/108153.

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Brennecke, J. F., M. A. Stadtherr, and J. E. Chateauneuf. Spectroscopy, modeling and computation of metal chelate solubility in supercritical CO{sub 2}. 1998 annual progress report. Office of Scientific and Technical Information (OSTI), June 1998. http://dx.doi.org/10.2172/13738.

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Bein, Thomas. Final report submitted to the Department of Energy [Encapsulation of metal chelate and oxo catalysts in nanoporous hosts]. Office of Scientific and Technical Information (OSTI), October 2000. http://dx.doi.org/10.2172/810523.

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Bahning, T. Treatment of geothermal condensate to reduce iron chelate consumption. Geothermal power initiative final report, September 30, 1997--March 31, 1998. Office of Scientific and Technical Information (OSTI), January 1998. http://dx.doi.org/10.2172/677065.

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Trotter, Patrick C. Genetic and Phenotypic Catalog of Native Resident Trout of the interior Columbia River Basin : FY-2001 Report : Populations in the Wenatchee, Entiat, Lake Chelan and Methow River Drainages. Office of Scientific and Technical Information (OSTI), October 2001. http://dx.doi.org/10.2172/807643.

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