Готові списки джерел за темами / Dosing sorbents

Добірка наукової літератури з теми "Dosing sorbents"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 31 травня 2022

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Статті в журналах з теми "Dosing sorbents"

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Gullick, Darren R., James V. Bruckner, Catherine A. White, Chen Chen, Brian S. Cummings, and Michael G. Bartlett. "Quantitation of Deltamethrin in Rat Liver and Muscle Homogenates Using Dispersive Solid-Phase Extraction with GC-NCI-MS." Journal of AOAC INTERNATIONAL 99, no. 3 (May 1, 2016): 813–20. http://dx.doi.org/10.5740/jaoacint.15-0314.

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Abstract An improved bioanalytical method to determine pyrethroids from small-volume (300 μL) rat liver and muscle homogenates was developed, validated, and applied to small-animal studies. The method used dispersive SPE (d-SPE) to clean the samples, and GC negative chemical ion MS (GC-NCI-MS) to analyze the samples. High-quality trace analysis of pyrethroids in biological samples was necessary to assess the health risk of environmentally encountered levels. Currently used highly sensitive methods to measure pyrethroids have focused on large-volume samples related to environmental exposure (water, soil, food products) or urine; however, there are no validated methods for quantifying this class of compounds in small-volume rat liver and muscle tissue homogenates. Individual rat tissue homogenate samples (300 μL) were prepared by protein precipitation using hexane-saturated acetonitrile. The samples were mixed on a vortex mixer and decanted into a d-SPE tube containing octadecylsilyl (C18) and primary secondary amine (PSA) sorbents and magnesium sulfate. The samples were centrifuged before evaporation to dryness. Pyrethroids were extracted and reconstituted from the residue using toluene in advance of injection into an Agilent Model 6890N gas chromatograph equipped with a Model 5973 quadrupole mass analyzer. Samples were ionized via electron capture in the negative ion mode using methane as a chemical ionization gas. Six qualifying ions were monitored using selected-ion monitoring for quantitation and verification of the analyte. Cis-permethrin was used as the internal standard. Method linearity was from 1 to 500 ng/mL for muscle and liver homogenates. The inter- and intraday precision and accuracy of the method were better than 20% at the lower LOQ and better than 15% over the remainder of the linear range. The method was used to elucidate tissue time-courses of deltamethrin (DLM) disposition following oral dosing of rats with 1 to 5 mg/kg in corn oil. DLM was monitored in rat tissue samples ≤24 h following dosing. Sample cleanup with d-SPE provided more selective chromatography than previous analytical methods.
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Thomas, Mary L., and Beverly S. Cohen. "A Simple Method for Vapor Dosing of Charcoal Sorbent Tubes." American Industrial Hygiene Association Journal 56, no. 1 (January 1995): 70–73. http://dx.doi.org/10.1080/15428119591017349.

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Saunders, Leslie J., Gabrielle Diaz-Blanco, Yung-Shan Lee, S. Victoria Otton, and Frank A. P. C. Gobas. "Hepatic Clearance Binding Terms of Hydrophobic Organic Chemicals in Rainbow Trout: Application of a Streamlined Sorbent-Phase Dosing Method." Environmental Science & Technology Letters 7, no. 9 (July 10, 2020): 672–76. http://dx.doi.org/10.1021/acs.estlett.0c00518.

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Lee, Yung-Shan, S. Victoria Otton, David A. Campbell, Margo M. Moore, Chris J. Kennedy, and Frank A. P. C. Gobas. "Measuring In Vitro Biotransformation Rates of Super Hydrophobic Chemicals in Rat Liver S9 Fractions Using Thin-Film Sorbent-Phase Dosing." Environmental Science & Technology 46, no. 1 (December 12, 2011): 410–18. http://dx.doi.org/10.1021/es203338h.

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Ramazanov, Arsen Sh, David R. Ataev, and Miyasat A. Kasparov. "OBTAINING HIGH QUALITY LITHIUM CARBONATE FROM NATURAL LITHIUM-CONTAINING BRINES." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 64, no. 4 (April 11, 2021): 52–58. http://dx.doi.org/10.6060/ivkkt.20216404.6238.

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Анотація:
The aim of this work is to develop a new effective technology for producing high-quality lithium carbonate from natural lithium-containing brines. Freshly deposited aluminum hydroxide was used to separate lithium from the trace amounts of sodium and calcium. It was found that the completeness of lithium extraction from brines purified from magnesium depends on the sorbent dosage, phase contact time, mineralization, pH, and brine temperature. To extract lithium from brines with a mineralization of less than 100 g/dm3, it is necessary to introduce 4 mol of aluminum hydroxide per 1 mol of lithium in the brine. For brines with a mineralization greater than 200 g/dm3, the consumption of the sorbent providing the extraction of lithium more than 96% is 2.5 mol of aluminum hydroxide. Desorption of lithium chloride from lithium-aluminum concentrate is carried out by processing 4-5 canopies of concentrate in a Soxlet type apparatus with the same volume of distilled water. The resulting concentrated solution of lithium chloride is purified from calcium impurities in contact with a saturated solution of lithium carbonate. From a heated aqueous solution of lithium chloride purified from calcium impurities, lithium carbonate is precipitated by dosing a stoichiometric amount of a saturated solution of sodium carbonate into it. The precipitate of lithium carbonate is separated from the mother solution, washed with three portions of a saturated solution of lithium carbonate at a ratio of solid to liquid by weight equal to one to five, in order of decreasing the concentration of sodium in each portion of the wash water. The dried product contains at least 99.6% Li2CO3.
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Tuzimski, Tomasz, and Anna Petruczynik. "Review of Chromatographic Methods Coupled with Modern Detection Techniques Applied in the Therapeutic Drugs Monitoring (TDM)." Molecules 25, no. 17 (September 3, 2020): 4026. http://dx.doi.org/10.3390/molecules25174026.

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Therapeutic drug monitoring (TDM) is a tool used to integrate pharmacokinetic and pharmacodynamics knowledge to optimize and personalize various drug therapies. The optimization of drug dosing may improve treatment outcomes, reduce toxicity, and reduce the risk of developing drug resistance. To adequately implement TDM, accurate and precise analytical procedures are required. In clinical practice, blood is the most commonly used matrix for TDM; however, less invasive samples, such as dried blood spots or non-invasive saliva samples, are increasingly being used. The choice of sample preparation method, type of column packing, mobile phase composition, and detection method is important to ensure accurate drug measurement and to avoid interference from matrix effects and drug metabolites. Most of the reported procedures used liquid chromatography coupled with tandem mass spectrometry (LC-MS/MS) techniques due to its high selectivity and sensitivity. High-performance chromatography with ultraviolet detection (HPLC-UV) methods are also used when a simpler and more cost-effective methodology is desired for clinical monitoring. The application of high-performance chromatography with fluorescence detection (HPLC-FLD) with and without derivatization processes and high-performance chromatography with electrochemical detection (HPLC-ED) techniques for the analysis of various drugs in biological samples for TDM have been described less often. Before chromatographic analysis, samples were pretreated by various procedures—most often by protein precipitation, liquid–liquid extraction, and solid-phase extraction, rarely by microextraction by packed sorbent, dispersive liquid–liquid microextraction. The aim of this article is to review the recent literature (2010–2020) regarding the use of liquid chromatography with various detection techniques for TDM.
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Vu, Ngoc Dan, Alina Vyacheslavovna Taneeva, and Vyacheslav Fedorovich Novikov. "Improvement of the gas chromatographic method for diagnosing developing defects in oil-filled electrical equipment based on the analysis of furan compounds." E3S Web of Conferences 288 (2021): 01080. http://dx.doi.org/10.1051/e3sconf/202128801080.

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During the operation of oil-filled electrical equipment under the influence of temperature, humidity and other negative factors, the destruction of paper insulation occurs. As a result of this destruction, furan compounds are formed, which get into the transformer oil. To identify the process of destruction of paper insulation, control of furan compounds in transformer oil is carried out by instrumental methods. Of these methods, the most widely used is gas chromatography using packed chromatographic columns, on the basis of which guidelines have been developed. To improve gas chromatographic methods for monitoring furan compounds, we used a highly efficient quartz capillary column filled with a polar stationary phase based on polyethylene glycol. The sample was injected into the injector of the chromatograph Chromos-GC1000 using an automated dosing system with a vial for 23 samples. Used transformer oil of the GK-1 brand of Almetyevsk electrical networks was taken as the object of research; The optimal retention characteristics of standard sorbates were preliminary determined, which were used as organic extractants of transformer oil and furan compounds. The effect of temperature on the process of chromatographic analysis of furfuryl alcohol and organic extractants was determined, on the basis of which it was established that the selectivity of separation is determined by the nature of intermolecular interactions in the sorbate-sorbent system, in particular, the formation of a hydrogen bond. It has been shown that the selectivity coefficient for the separation of furfuryl alcohol depends on the physicochemical nature of organic extractants, their boiling points and dipole moments and has the highest values for the analyzed pair of components: furfuryl alcohol - ethanol.
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Warchoł, Jolanta Karolina, Paulina Sobolewska, Włodzimierz Tylus, and Roman Petrus. "Fixed-Bed Modification of Zeolitic Tuffs and Their Application for Cr(VI) Removal." Materials 14, no. 22 (November 21, 2021): 7061. http://dx.doi.org/10.3390/ma14227061.

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Natural clinoptilolite tuff (CL) and chabazite-clinoptilolite tuff (CH) were modified in fixed-bed column by immobilization of hexadecyltrimethylammonium bromide (HDTMA-Br), then investigated as a sorbent for inorganic anions of Cr(VI). The proposed modification technique combined with surfactant solution batching allows minimizing the surfactant loses through foaming and crystallization and creation of stable organic coverage. The HDTMA loading depended on the mineral composition of the zeolitic tuff, the topology of its external surface, and process conditions. The maximum surface coverage was obtained by gradually dosing surfactant solution in the smallest volume of batches and corresponded up to 100% and 182% of external cation exchange capacity (ECEC) for mono and double layer coverage, respectively. In case of mono layer coverage, modification proceeds until the exhaustion of surfactant in supply solution, while in the double layer one, until equilibrium of HDTMA concentration in both zeolitic and liquid phases was established. The efficiency of Cr(VI) uptake by prepared surface modified zeolites (SMZs) increased with increasing of HDTMA loading. In the case of mono layer SMZs, the capacities of CH-HDTMA and CL-HDTMA were 10.3 and 5.4 mg/g, respectively, while in the case of double layer SMZs, the amount of Cr uptake on CH-HDTMA and CL-HDTMA were 16.8 and 15 mg/g, respectively. Ion exchange is the predominant mechanism of Cr(VI) sorption but it takes place only if modification resulted in at least partial double layer coverage. The XPS analysis reveals Cr(VI) reduction to a less-toxic Cr(III) by the electron donating N-containing groups and by reaction with Fe+2 ions on the zeolite external surface.
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Дисертації з теми "Dosing sorbents"

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Сусь, Марія Олександрівна. "Дослідження і розробка процесу безпечної дезінфекції води знезаражувальними агентами неокисної дії". Doctoral thesis, Київ, 2015. https://ela.kpi.ua/handle/123456789/13824.

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