Investigation of Adverse Effect of Coexisting EDTA during Chelating-resin Solid Phase Extraction on the Determination of Trace Elements in Environmental Water Samples by ICP-MS

FUJIMORI Eiji, KUMATA Hidetoshi, UMEMURA Tomonari

doi:10.2116/bunsekikagaku.70.31

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Other Title

キレート樹脂固相抽出/ICP-MSにおける環境水中微量元素分析に及ぼす共存EDTAの影響
キレートジュシコソウチュウシュツ/ICP-MS ニオケルカンキョウスイチュウビリョウゲンソブンセキニオヨボスキョウソン EDTA ノエイキョウ

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<p>When chelating-resin solid phase extraction (SPE) was used for the preconcentration of trace elements in environmental water samples around sewage treatment plants (STP), low recovery values for several elements were observed. In the present work, the adverse effect of coexisting EDTA on the recovery of various elements during the SPE procedure was investigated in detail. It was found that EDTA was contained in the environmental water at several hundred nmol L⁻¹ level, and interfered with the adsorption of trace elements, especially Fe, Cu and heavy rare earth elements on the chelating-resin due to the formation of stable complexes. Therefore, an acid treatment was applied to decompose EDTA molecules. As a result of the acid treatment with HNO₃ and H₂O₂ at 200 °C for 4 h, almost all of the elements were quantitatively recovered from the environmental water by chelating-resin SPE with good reproducibility. The feasibility of the present method was examined by analyzing a river water certified reference material (JSAC 0302-3c). The present method was applicable for the determination of trace elements including rare earth elements in an environmental water sample around STP with good precision.</p>

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BUNSEKI KAGAKU

BUNSEKI KAGAKU 70 (1.2), 31-37, 2021-01-05

The Japan Society for Analytical Chemistry

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