Simultaneous determination of copper, cobalt, and mercury ions in water samples by solid-phase extraction using carbon nanotube sponges as adsorbent after chelating with sodium diethyldithiocarbamate prior to high performance liquid chromatography
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Sodium diethyldithiocarbamate
Solid phase extraction
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Solid phase extraction
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Matrix (chemical analysis)
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The current study portrays a dispersive solid-phase extraction as a silica nanoparticle-covered Graphene Oxide(GO-SiO2) synthesised with some modification as in the literature and developed removal/preconcentration method for selective extraction of some heavy metal in water samples. Flame atomic absorption spectrophotometry (FAAS) was used to measure in optimum conditions for the proposed method. Field emission scanning electron microscope (FESEM) and X-beam diffraction (XRD) were utilised for the characterisation of solid phase. The developed method presents high surface areas for sorption capacity and a low amount of solid phase. The removal percentage was performed at approximately 100% with pH 4 to 10 for all metal ions. According to validation results under the optimised method, the limits of detection (LODs) and quantification (LOQs) were found in the range of 5.8–23.0 µg L−1 and 16.0 − 38.1 µg L−1, respectively. The developed method was applied by using certified reference material (BCR 715) for trueness, which observed high relative recovery with lower than 11.8% relative error except for Pb and Cd. The comparison between the experimental results and the certified reference material indicated that the accuracy of the method is higher than 90%. The proposed method was effectively practised for five water samples with standard addition.
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Solid phase extraction
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水中の強キレート剤は,pH10で当量の酸化銅(II)の沈殿を可溶化する.遠心分離後,上澄液を分取し,ジエチルジチオカルバミン酸ナトリウム(NaDDTC)を加えると,配位子交換によりCu(DDTC)2を生じ,四塩化炭素に抽出される.抽出相の吸光度を436nmで測定して,河川水や排水中の強キレート剤の間接定量を行った.この方法では,試料水中の強キレート剤の合量が求められる.実際の試料中では,強キレート剤の種類が不明なことが多いので,これと当量の銅(II)の量で表示することを提案する.
Sodium diethyldithiocarbamate
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Solid phase extraction
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Sodium diethyldithiocarbamate
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Antidote
Cadmium chloride
EGTA
Sodium diethyldithiocarbamate
Chelation Therapy
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Abstract An experimental study was conducted on the chelation and electrolytic foam separation of trace amounts of copper, nickel, zinc, and cadmium from a synthetic chelated metal wastewater. Sodium ethylenediaminetetraacetate (EDTA), citrate, sodium diethyldithiocarbamate (NDDTC), and potassium ethyl xanthate (KEtX) were used with sodium dodecylsulfate (NaDS) as a foam-producing agent. Experimental results from an electrolytic foam separation process showed that chelating agents NDDTC and KEtX, due to their higher chelating strength and hydrophobic property, can efficiently separate Cu and Ni from chelated compounds (Cu, Ni/EDTA, and Cu, Ni/citrate). In a Cu-EDTA-NDDTC system with a chelating agent/metal ratio of 4, the residual Cu(II) concentration is 0.7 mg/L. The effects of chelating agent types and different chelating agents concentrations on the removal of metal ions were studied. The effect of NaDS dosage on flotation behavior and the efficiency of metal removal were also investigated.
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The effect of pre-treatment with sodium 2,3-dimercaptopropane 1-sulfonate (DMPS), sodium diethyldithiocarbamate (DDC) and calcium trisodium diethylenetriaminepentaacetate (DTPA) on the fate of injected mercuric chloride in rats was investigated. DMPS was the most effective chelator in reducing the uptake of Hg (203) in tissues and was the only chelator to enhance the urinary excretion of Hg (203). The results suggest affinity of Hg towards sulfur moiety and that the protective effects of pre-treatment are also shared by non-steroidal thiol chelators.
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The effect of chelating agents added to nutrient solutions on plants growing in these solutions was investigated. Chelating chemicals used were: 8-hydroxyquinoline (oxine), sodium diethyldithiocarbamate (carbamate), sodium 1:8 dihydroxynaphthalene 3:6 disulphonate (chromatropic salt), sodium 1-nitroso-2-naphthol 3:6 disulphonate (nitroso-R-salt), tetrahydroxyanthraquinone (quinalizarin), and hydroxy-benzoic acid (salicylic acid). Germination and seedling studies with tomato, pea, bean, corn, and radish, and water culture tests with tomatoes, using various concentrations of the chelating agents, are described, and plant responses to these reagents examined. Iron was the only metal ion effectively removed from solution at low concentrations of oxine, carbamate, nitroso-R-salt, and quinalizarin. Iron was not effectively chelated by either chromatropic salt or salicylic acid. Concentrations of chelating agents in which plants would grow did not chelate metal ions effectively, while concentrations of chelating agents which chelated effectively produced severe plant injury. This injury resulted from heavy metals being extracted from the root cells. Since effective chelation in the nutrient solution results in severe plant injury, the use of such agents in nutrient solutions in direct contact with the roots of growing plants is not a feasible method of controlling trace metal contamination in such solutions.
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