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Determination of Multiple Trace Elements in Seawater Using Chelation Ion Chromatography and ICP-MS

LIU Gang1,2, ZHONG Shao-Jun1, QU Chen-Li1,2, LIU Fei1, XU Li-Jun1   

    1. Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
    2. Graduate School, Chinese Academy of Sciences, Beijing 100039, China
  • Received:2006-06-16 Revised:1900-01-01 Online:2007-01-10 Published:2007-01-10
  • Contact: LIU Gang

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Abstract: An off-line chelation system combined with ICP-MS technique was developed for the quantitative determination of trace elements in seawater, namely V, Co, Ni, Cu, Zn, Mo, Cd, Pb, U and rare earth elements(REEs). The system was built based on an ion chromatography equipped with MetPac® CC-1 chelation columns which had a strong selective chelation to these target elements within a pH range 5.2—5.6. Acidified seawater samples and NH4Ac(2 mol/L) were blended to meet suitable pH before being injected into the chelation column, thus target elements were retained while alkali and alkaline metals were excluded. Then chelated elements were eluted by HNO3(1 mol/L) and samples were collected for ICP-MS analysis. Varying the ratio of input(gen. 200 mL) to output(gen. 5 mL), the target elements which were concentrated as 40 times as their concentrations were far beyond instrumental quantification limits. At last, a certificated seawater CASS-4 was introduced and our detected values were in good agreement with those certified values.

Key words: Trace element, Seawater, Off-line chelation, Ion chromatography, ICP-MS

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