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KMID : 1059519940380120898
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Journal of the Korean Chemical Society
1994 Volume.38 No. 12 p.898 ~ p.907
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Studies on Partition and Extraction Equilibria of Metal-Dithiocarbamate Complexes(Ⅰ). Solvent Extraction of Inorganic Trace Mercury(Ⅱ)
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Choi Ho-Sung
Choi Jong-Moon
Choi Hee-Seon
Kim Young-Sang
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Abstract
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The solvent extraction of an inorganic trace mercury in sea water samples was studied using zinc diethyldithiocabamate Zn(DDC)2 as chelating agent. The Zn(DDC)2 which maintained the stability of DDC- in the acidic aqueous solution in the course of extraction was synthesized from NaDDC and ZnSO4 in this laboratory. The trace of mercury(Ⅱ) was extracted at pH 3.0 from 100 ml of sea water into 10ml of chloroform containing 0.05 M Zn(DDC)2 by shaking for 5 minutes. And from the organic phase, the Hg(DDC)2 was back-extracted into 10ml of 1 to 1 mixed acid of each 3% (v/v) nitric acid and hydrochloric acid by shaking for 25 minutes. The mercury back-extracted was determined by a cold vapor atomic absorption spectrophotometry. The trace mercury(Ⅱ) was so successfully extracted that this procedure could be applied to its determination in the sea water. That is, the recoveries of mercury in two kinds of samples into which as given amount of Hg(Ⅱ) was spiked were 90.0% and 93.3%, respectively.
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