ジチゾン共沈法による微量元素の分離,濃縮

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The carrier precipitation of microgram quantities of gold, silver, mercury, palladium, copper, cobalt and zinc were investigated using dithizone as a collector. A single precipitation of dithizone gathered gold, silver, mercury, palladium and copper completely from diluted nitric hydrochloric, or sulfuric acid solution. Cobalt and zinc were collected almost quantitatively at pH 89. The presence of complexing agents, however, decreased the carrier precipitation of these elements. The metal chelates extracted well into dithizone-CCl4 (or -CHCl3) were always carried down efficiently with 5 mg of dithizone. The percent of recovery vs. pH relationship was quite similar as was observed for solvent extraction. The precipitates of dithizone were readily decomposed by the ignition or the wet ashing with nitric and perchloric acids. The information derived from these experiments were applied to the separation and determination of trace gold in copper, iron, lead, manganese, nickel and zinc.
社団法人日本分析化学会の論文