Bibliografias temáticas / Exchangeable copper

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Literatura científica selecionada sobre o tema "Exchangeable copper"

Autor: Grafiati

Publicado: 8 de fevereiro de 2025

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Artigos de revistas sobre o assunto "Exchangeable copper"

Alekseev, S., I. Budnichenko, D. Husarova, Yu Dobrozhan, M. Ischenko e S. Stanislaviv. "Preparation and Characterization of Reference Material for Determination the Total Content and Exchangeable Forms of Metallic Elements in Soils". Methods and Objects of Chemical Analysis 19, n.º 2 (2024): 59–66. http://dx.doi.org/10.17721/moca.2024.59-66.

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Reference material of soil for determination of total content of copper, iron, manganese, nickel, and zinc, according to ISO 11466-2001, and for the operationally defined method of determination of exchangeable forms of these elements according to series of standards DSTU 4770, with ammonium acetate as an extractant is prepared and characterized. The studied material demonstrated sufficient homogeneity to exchangeable forms of metals and for the total content of copper, nickel, and zinc. The homogeneity of the material to manganese and iron is insufficient due to the presence of these metals in non-uniformly distributed magnetic microparticles (<10 μm). An interlaboratory experiment, performed to obtain assigned values of the sample characteristics, demonstrated sufficiently good agreement between the laboratories. An uncertainty of the assigned value corresponds to 30–50% for exchangeable forms of copper and nickel and 10–13% for exchangeable forms of iron, manganese, and zinc. An expanded uncertainty of assigned values of the total content of copper, nickel, and zinc is sufficient for the application of the material for methods validation and internal quality control.

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Nascimento, Clístenes Williams Araújo do, Renildes Lúcio Ferreira Fontes e Adilson César Fortes Dias Melicio. "Copper availability as related to soil copper fractions in oxisols under liming". Scientia Agricola 60, n.º 1 (fevereiro de 2003): 167–73. http://dx.doi.org/10.1590/s0103-90162003000100025.

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The knowledge of the chemical forms of copper in soils and the relationships of these forms with soil copper availability are important for predicting the copper behavior in the soil-plant system. The present work studies the influence of liming on the available contents of copper as well as on the forms of copper fractions in six types of Oxisols. Soil samples, with and without liming, received copper at rates of 0.0, 20.0 and 40.0 mg dm-3 and remained incubated for 30 days. Then, available copper was extracted with Mehlich-1, Mehlich-3, DTPA and EDTA solutions, and analyzed by atomic absorption spectrophotometry. Additionally, soil samples were extracted in a sequential procedure to determine Cu in fractions of soil, as follows: exchangeable-Cu fraction, organic matter-Cu fraction, Mn oxide-Cu fraction, amorphous Fe oxide-Cu fraction, crystalline Fe oxide-Cu fraction, residual-Cu fraction, and the total Cu content in the soil. Soil samples to which Cu was added presented higher Cu retention in the organic matter fraction with a small percentage retained in the exchangeable-Cu fraction. Liming resulted in a decrease of Cu in the exchangeable and organic matter fractions and an increase in the Fe and Mn oxide fractions and in the residual fraction. Without liming, the organic matter fraction presented the highest contribution to Cu content found in the soil extracts obtained with all extractors, except EDTA. For treatments with liming, Cu contents in the organic matter fraction were better correlated to Cu contents in extracts obtained with DTPA and Mehlich-3.

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Salam, Abdul Kadir, Hery Novpriansyah e Henrie Bucharie. "Metal Extractability Changes in Soils Under Thorny Amaranth". SAINS TANAH - Journal of Soil Science and Agroclimatology 19, n.º 2 (30 de dezembro de 2022): 211. http://dx.doi.org/10.20961/stjssa.v19i2.65456.

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The different forms of heavy metals may be significantly extracted from soils by plant roots. In a glasshouse experiment, the shifting of soil heavy metal forms under thorny amaranth was examined. To accomplish the research goal, thorny amaranth was planted for four weeks at field water content in soils with varying Cu and Zn contents. Copper and Zn levels in the soil were measured both before and after planting. High soil Cu and Zn levels reduced this plant's height and dry biomasses. Thorny amaranth considerably reduced the exchangeable and available Cu and Zn in the soil. The soil exchangeable and available Cu and Zn had a good correlation with the plant uptakes of these elements. Copper and Zn reductions by planting significantly lower than the available Cu and Zn. A significant portion of the soil exchangeable Cu and Zn shifted to stronger bonding during the incubation time. It was demonstrated that plants absorbed more Cu and Zn from forms different than the soil-exchangeable forms.

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Heissat, Sophie, Amélie Harel, Khémary Um, Anne-Sophie Brunet, Valérie Hervieu, Olivier Guillaud, Jerome Dumortier, Alain Lachaux, Elisabeth Mintz e Muriel Bost. "Evaluation of the accuracy of exchangeable copper and relative exchangeable copper (REC) in a mouse model of Wilson’s disease". Journal of Trace Elements in Medicine and Biology 50 (dezembro de 2018): 652–57. http://dx.doi.org/10.1016/j.jtemb.2018.06.013.

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Chen, Lingyuan, Touqeer Abbas, Lin Yang, Yao Xu, Hongyan Deng, Lei Hou e Wenbin Li. "Effect of modified pomace on copper migration via riverbank soil in southwest China". PeerJ 9 (27 de julho de 2021): e11844. http://dx.doi.org/10.7717/peerj.11844.

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To explore the effects of modified pomace on copper migration via the soil on the banks of the rivers in northern Sichuan and Chongqing, fruit pomace (P) and ethylene diamine tetra-acetic acid (EDTA) modified P (EP) were evenly added (1% mass ratio) to the soil samples of Guanyuan, Nanbu, Jialing, and Hechuan from the Jialing River; Mianyang and Suining from the Fu River; and Guangan and Dazhou from the Qu River. The geochemical characteristics and migration rules of copper in different amended soils were simulated by column experiment. Results showed that the permeation time of copper in each soil column was categorized as EP-amended > P-amended > original soil, and the permeation time of amended soil samples at different locations was Jialing > Suining > Mianyang > Guangan > Dazhou > Nanbu > Guanyuan > Hechuan. Meanwhile, the average flow rate of copper in each soil column showed a reverse trend with the permeation time. Copper in exchangeable, carbonate, and iron–manganese oxide forms decreased with the increase of vertical depth in the soil column, among which the most evident decreases appeared in the carbonate-bonding form. The copper accumulation in different locations presented a trend of Jialing > Suining > Mianyang > Guangan > Dazhou > Nanbu > Guangyuan > Hechuan, and the copper content under the same soil showed EP-amended > P-amended > original soil. The copper proportion of the carbonate form was the highest in each soil sample, followed by the exchangeable form. The proportions of iron-manganese oxide and organic matter forms were relatively small. A significant correlation was observed between the cation exchange capacity and the copper content in exchangeable and carbonate forms. Moreover, total organic carbon and copper contents were negatively correlated.

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Schmitt, Françoise, Guillaume Podevin, Joël Poupon, Jérôme Roux, Pierre Legras, Jean-Marc Trocello, France Woimant, Olivier Laprévote, Tuan Huy NGuyen e Souleiman El Balkhi. "Evolution of Exchangeable Copper and Relative Exchangeable Copper through the Course of Wilson's Disease in the Long Evans Cinnamon Rat". PLoS ONE 8, n.º 12 (17 de dezembro de 2013): e82323. http://dx.doi.org/10.1371/journal.pone.0082323.

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Magalhães, Sulamirtes S. de A., e Oscarlina L. dos S. Weber. "Zinc and copper fractions in Oxisols of different textures fertilized with pig slurry". Revista Brasileira de Engenharia Agrícola e Ambiental 25, n.º 6 (junho de 2021): 386–92. http://dx.doi.org/10.1590/1807-1929/agriambi.v25n6p386-392.

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HIGHLIGHTS Higher concentrations of exchangeable Zn were found in areas with pig slurry application. No higher concentrations of Cu were found in the exchangeable fraction in areas using pig slurry. In all study areas, it was observed that more than 70% of Cu is in recalcitrant forms.

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Buckley, Wayne T., e Richard A. Vanderpool. "Analytical variables affecting exchangeable copper determination in blood plasma". BioMetals 21, n.º 6 (11 de junho de 2008): 601–12. http://dx.doi.org/10.1007/s10534-008-9146-7.

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Woimant, France, Nouzha Djebrani-Oussedik e Aurélia Poujois. "New tools for Wilson’s disease diagnosis: exchangeable copper fraction". Annals of Translational Medicine 7, S2 (abril de 2019): S70. http://dx.doi.org/10.21037/atm.2019.03.02.

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Lazo, Andrea, Henrik Hansen, Pamela Lazo e Claudia Gutiérrez. "Application of a Sequential Extraction Method for Analyzing Cu Distribution in Pre-Treated Mine Tailings after Electrodialytic Remediation". International Journal of Environmental Research and Public Health 16, n.º 4 (18 de fevereiro de 2019): 584. http://dx.doi.org/10.3390/ijerph16040584.

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Mine tailings have been analyzed by a sequential extraction procedure after their pre-treatment with a leaching solution for 24 h and electrodialytic remediation during 15 days with a constant electric field of 2.7 V cm−1. Four leaching solutions were tested: H2SO4 + HNO3 (2:1 vol.) pH = 1.9; H2SO4 + HNO3 (2:1 vol) pH = 4.2; NH4Cl 0.8M, pH = 5.5 and 30% H2O2 adjusted to pH 2 with HNO3 1M + HCl 1M. After the treatment, the tailings were divided in six slices from anode to cathode. The highest removal efficiency of copper was obtained with H2SO4 + HNO3 pH = 1.9, which allows one to remove 67% of the copper in the total cell and 85% of the copper in the slice closest to anode. The same solution with pH = 4.2 allows one to remove 62% of the total copper. The analysis realized by the sequential extraction method indicates the easy removal of water-soluble and exchangeable fractions in all experiments, moreover, residual and sulfide are the less mobile fractions. The general trend was the movement of copper associated to different fractions from anode to cathode and its accumulation closest to the cathode in the case of exchangeable, Fe-Mn oxides and acid soluble fractions, possibly due to some precipitation of copper compounds associated with less acidic conditions.

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Mais fontes

Teses / dissertações sobre o assunto "Exchangeable copper"

Zimmeter, Katharina. "Développement de sondes IRM à base de peptides ou thiosemicarbazones pour la détection de cuivre(II) dans le milieu physiologique". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAF046.

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Le cuivre échangeable, principalement lié à l'albumine sérique humaine (HSA) dans le sang, est un biomarqueur potentiel pour des maladies comme celles de Wilson et d’Alzheimer. Aucune méthode spécifique pour le détecter in vivo n'existant à ce jour, cette thèse présente des avancées dans la conception de sondes IRM (imagerie par résonance magnétique) responsives au CuII via deux approches : les agents de contraste (AC) de type q et τR, intégrant chacun un complexe de gadolinium et un ligand spécifique du CuII. Une partie de la thèse est dédiée à la synthèse et à l’étude de ligands adaptés à ces deux approches avec une affinité et une sélectivité suffisantes pour le CuII : des dérivés du motif peptidique ATCUN pour les sondes de type q et des α-pyridyl-thiosemicarbazones pour les sondes de type τR. L'autre partie porte sur leur association avec des agents IRM et leur caractérisation. Les sondes étudiées ont validé le principe des deux approches, bien que des optimisations restent nécessaires. Une relaxivité accrue de presque 400% a été observée pour l'AC de type q, DO3A-pyrGH, en présence de CuII, et une augmentation faible, mais notable pour les sondes τR en présence simultanée de CuII et de HSA
Exchangeable copper, which is primarily bound to human serum albumin (HSA) in the blood, is a potential biomarker for diseases such as Wilson's and Alzheimer's. To date, there is no specific method for its detection in vivo. This thesis presents progress in the design of CuII-responsive MRI (magnetic resonance imaging) probes through two approaches: q-based and τR-based contrast agents (CAs), each containing a gadolinium complex and a CuII-specific ligand. One part of the work is dedicated to the development of ligands adapted to these two approaches, with sufficient CuII-affinity and selectivity: derivatives of the peptidic ATCUN motif for q-based probes and α-pyridyl thiosemicarbazones for τR-based probes. The other part focuses on their incorporation into MRI CAs and their characterization. The probes studied proved the principle of both approaches, although optimizations are still needed. An increase in relaxivity of nearly 400% was observed for the q-based CA, DO3A-pyrGH, in the presence of CuII, and a small but notable increase for τR-type probes in the simultaneous presence of CuII and HSA

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Chang, Hao-Ching, e 張皓晴. "Electronic Structure and Reactivity of Trigonal Bipyramidal Copper(III) Complexes with an Exchangeable Axial Ligand". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/83660685394242053568.

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博士
國立臺灣師範大學
化學系
104
A trigonal bipyramidal copper(III) complex, [PPN][Cu(TMSPS3)(Cl)] (complex 1), was synthesized following our previous studies. Basing on the correlation between yields and preparation conditions as well as DFT calculations, we propose a thermodynamically favored copper(II) disproportionation occurs within a TMSPS3–Cu2Cl4 intermediate, producing complex 1 and a copper(I) side-product. UV–vis titrations of complex 1 with various additive ligands, such as N3− (Keq = 18), DABCO (8), pyridine (0.13) and 2,6-lutidine (0.0010), comply 1:1 ligand–chloride exchange in solution, hence clarifying the semi-stability of complex 1 in solution phase. Derivatized [PPN][Cu(TMSPS3)(N3)] (complex 2), [Cu(TMSPS3)(DABCO)] (complex 3) and [PPN][Cu(TMSPS3)(NCS/Cl)] (complex 4/1) were then accordingly synthesized. Cu and S K-edge X-ray absorption spectra of complexes 1–3 reveal the elevated LUMO (3dz2 feathered) in TBP ligand field with their +3 oxidation state of copper and the Cu–thiolate covalency. These indicate the electron density compensation (S→Cu) within Cu(TMSPS3) moiety, which not only stabilizes copper(III) center but also supresses the electrostatic demand for the axial ligand binding. A cyano derivative, [PPN][Cu(TMSPS3)(CN)] (complex 5), was isolated from the reaction of complex 1 with NaOH in CH3CN; and a cyanomethide-bound copper(III) intermediate is evidenced by NMR, UV–vis, and IR spectra, responsible for the C–CN bond cleavage of CH3CN solvent. Additionally, chloride of complex 1 is abstracted by Sc(OTf)3, which exposes the copper(III) moiety and leads the formation of dimeric [Cu(TMSPS3)]2 (complex 6). These results facilitate further development of high-valent copper catalysts.

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Trabalhos de conferências sobre o assunto "Exchangeable copper"

Gorbunova, Nadezhda, Arkadi Gromovik, E. Zaharova, A. Safonova e D. Davydova. "INFLUENCE OF GRAIN STRAW ON THE CONTENT OF ZINC AND COPPER IN LEACHED CHERNOZEMS OF THE RAMON DISTRICT OF THE VORONEZH REGION". In Reproduction, monitoring and protection of natural, natural-anthropogenic and anthropogenic landscapes. FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov, 2022. http://dx.doi.org/10.34220/rmpnnaal2021_63-67.

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The influence of the introduction of grain straw and cellulosolytic micromycete on the seasonal dynamics of exchangeable compounds of zinc and copper under the conditions of a multifactorial field experiment on leached chernozems was studied. It is shown that straw, with a lack of other fertilizers, is able to replace them, enriching the soil with valuable organic substances. The results obtained indicate that the introduction of green manure significantly increases the content of exchangeable compounds Zn and Cu, especially when a cellulolytic micromycete is added to the straw, which accelerates its decomposition. There is a decrease in the amount of exchangeable Zn and Cu compounds by the end of the growing season, due to their intensive consumption by plants. The data obtained indicate the absence of contamination of the studied soils with elements, on the contrary, they note the lack of exchangeable Zn and Cu compounds.

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