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

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 several were observed. In present work, adverse effect coexisting EDTA on various during SPE procedure investigated detail. It found that contained at hundred nmol L?1 level, and interfered with adsorption elements, especially Fe, Cu heavy rare earth due to formation stable complexes. Therefore, an acid applied decompose molecules. As a result HNO3 H2O2 200 °C 4 h, almost all quantitatively recovered from by good reproducibility. The feasibility method examined analyzing river certified reference material (JSAC 0302-3c). applicable determination including sample STP precision.