原子吸光法によるカドミウム, 鉛, 亜鉛の分析法 : 第2報河川底質, 水田土壌の分析における同時抽出法について

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The decomposition by alkaline fusion, the simaltaneous extraction with a dithizone-carbontetrachloride solution and the atomic absorption spectrometry have been utilized for the quantitative analysis of heavy metals such as cadmium, lead and zinc in soil.The optimum pH for the extraction was found to be around 9.5 and the priority of making dithizonates for each metal ion was shown to be the following order; Cd>>Pb>Zn, among which there was not a great difference between the latter two. With the exception of low lead content (10μg), the relative standard deviation of less than 5% and the recovery of 94 to 117% were obtained for this analytical procedure. When concentration of lead was relatively low, APDC-MIBK or APDC-chloroform methods produced a higher sensitivity.Analytical data on the supposedly cadmium-polluted area around the Jinzu River and on a nonpolluted control area were also described.