应用离子色谱离线螯合及ICP-MS测定海水中多种痕量元素  

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

作　　者：刘刚[1] 钟少军[1] 瞿成利[1] 刘飞[1] 徐丽君[1] 

机构地区：[1]中国科学院海洋研究所海洋地质与环境重点实验室

出　　处：《高等学校化学学报》2007年第1期53-55,共3页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金重点项目(批准号:40376038)资助

摘　　要：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.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.

关 键 词：痕量元素 海水 离线螯合 离子色谱 ICP—MS 

分 类 号：O652.6[理学—分析化学] O657[理学—化学]