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本文研究以PbS—Ag_2S压片烧结制作的铅离子选择性电极用于测定污染土壤中铅的方法。在0.1M氯化钠介质中,铅离子浓度在5×10~(-6)—10~(-2)M范围内E——log CPb~(++)呈綫性关系。污染土壤中的铅用HCl—HNO~δ溶解,在PH 2用双硫腙—四氯化碳溶液萃取除去Cu~(++)、Hg~(++)和Ag~+,用抗坏血酸治除Fe~(+++)的干扰,在PH 3.5—5.5以标准加入法测定铅含量,结果与双硫腙比色法,极谱法和容量法一致。
In this paper, PbS-Ag_2S tableting sintered lead ion selective electrode for the determination of lead in contaminated soil method. In 0.1 M sodium chloride medium, the concentration of lead ion showed a linear relationship with E - log CPb ~ (++) in the range of 5 × 10 -6 -10 -2 M. Lead in contaminated soils was dissolved with HCl-HNO-δ, and Cu ~ (++), Hg ~ (++) and Ag ~ + were extracted by dithizone-carbon tetrachloride solution at pH 2 and treated with ascorbic acid Fe ~ (+++) interference, the determination of lead content by standard addition method at pH 3.5-5.5 results consistent with the dithizone colorimetry, polarography and volumetric method.