Extraction of zinc from sea water Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/ws859k49h

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  • A liquid-extraction procedure for the concentration of zinc in sea water was developed. The metal ion in sea water was chelated with sodium diethyldithiocarbamate and extracted into an organic solvent, methylisobutylketone, at the normal pH of sea water. A back-extraction into HCl followed, providing a concentration of 30X for the entire procedure. Filtration was introduced into the procedure to insure that only dissolved forms were extracted and that no influence from particulate matter would be detected. Problems of loss of zinc and/or contamination arose. These were overcome to a great extent by washing all glassware, including the sinterred-glass filter holder, in nitric acid and by following the filtration through the glass holder with an acid rinse. Purification of reagents was found necessary. With replicate analyses on a given sea water source, the recovery was 97 ± 2%. Upon making varying standard additions to subsamples of sea water, the calculated recovery was 97 ± 5.4%. The contamination figure for the extraction process ranged from zero to 0.8 ppb in the original sea water sample. With filtration, an overall median contamination of 1.4 ± 1 ppb was determined.
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