簡易溶媒抽出-超音波ネブライザー法を用いた誘導結合プラズマ発光分析による水中微量金属の同時定量

抄録

For the rapid and sensitive determination of metals in water by inductively coupled plasma emission spectrometry (ICP-ES), a combination of simple solvent extraction with a modified volumetric flask and introduction of the extract to the ICP torch by ultrasonic nebulization was investigated. Sample solution (260 ml), ammonium pyrrolidinedithiocarbamate (APDC) solution, hexamethyleneammonium hexamethlenedithiocarbamate (HMAHMDC) methanolic solution, acetate buffer(pH 4.2), and 8 ml of diisobutylketone(DIBK) were stirred vigorously in the extraction vessel for 7 min by a magnetic stirrer. The extract was introduced into the ultrasonic nebulizer by the displacement bottle method and analyzed by ICP-ES. Detection limits for Cd, Co, Cu, Fe, Mo, Ni, Pb, Zn, and V of the method were consistently lower than those by a pneumatic nebulizer. Metal blank was lower (<0.005μg) than that of the separatory funnel method. The proposed method was applied to the analysis of NBS SRM 1643a, metal plating plant waste waters, and coastal seawaters.