【摘 要】
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【摘要】研究了吡咯烷二硫代氨基甲酸铵(APDC)-Cu(Ⅱ)共沉淀分离富集徽量注射进样火焰原子吸收测定痕量铅的适宜条件。在pH3的溶液中,APDC-Cu(Ⅱ)能定量地共沉淀铅。工作曲线
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【摘要】研究了吡咯烷二硫代氨基甲酸铵(APDC)-Cu(Ⅱ)共沉淀分离富集徽量注射进样火焰原子吸收测定痕量铅的适宜条件。在pH3的溶液中,APDC-Cu(Ⅱ)能定量地共沉淀铅。工作曲线线性范围为0～25μg/20ml.方法的特征浓度为6.2×10~(-2)μg·ml~(-1).测定铅含量3.6μg·ml~(-1)的样品的变异系数为5.5%。标准加入回收率92～104%。方法快速简便,用于酱油中铅的测定,共存物质不产生干扰,获得了较为满意的结果。
【Abstract】 The suitable conditions for the determination of trace lead by flame atomic absorption spectrometry (ICP-AES) with coprecipitation of pyrrolidine dithiocarbamate (APDC) -Cu (Ⅱ) were studied. In the solution of pH3, APDC-Cu (Ⅱ) can co-precipitate Pb in a quantitative manner. The linear range of the working curve was 0 ~ 25μg / 20ml.The characteristic concentration of the method was 6.2 × 10 -2 μg · ml -1 .The coefficient of variation (CV) of the sample with the lead content of 3.6 μg · ml -1 5.5%. Standard recovery rate of 92 to 104%. The method is rapid and simple and is suitable for the determination of lead in soy sauce. The coexisting substances do not interfere with each other, and the satisfactory results are obtained.
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