吸光光度法による硫化鉱中のビスマスの定量
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The content of Bi in sulfide ore is determined by two stage extraction with sodium diethyl-dithiocarbamate and carbon tetrachloride (Na-DDTC-CCl<SUB>4</SUB>).<BR>The ordinary method, which extracts Bi by Na-DDTC-CCl<SUB>4</SUB> from a basic solution of sample containing NH<SUB>4</SUB>-citrate, EDTA and KCN, gives a large positive error owing to the co-existence of Fe<SUP>3+</SUP> and Pb<SUP>2+</SUP>. But the extracted amount of Fe and Pb accompanying with Bi is so small that the second Na-DDTC-CCl<SUB>4</SUB> extraction for the solution obtained by decomposition of the first extract with HNO<SUB>3</SUB>-H<SUB>2</SUB>SO<SUB>4</SUB> gives an accurate result. Sodium sulfite is added to the sample solution together with other masking agents because it is effective for suppressing the influence of Fe<SUP>3+</SUP>.<BR>The relation of the absorbance at 366 mμ and the amount of Bi is linear within the range of 0.5 15 μg Bi/m<I>l</I> CCl<SUB>4</SUB>. Accurate results are obtained for 0.00<I>n</I>% Bi.
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