Determination of Trace of Methylmercury in Seawater by Isotope Dilution/Gas Chromatography-Inductively Coupled Plasma Mass Spectrometry with an Automatic Distillation
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KeyWord:gas chromatography-inductively coupled plasma mass spectrometry(GC-ICP-MS)  isotope dilution  seawater  methylmercury  automatic distillation apparatus
LENG Jin-hui,WANG Li-jun,LIU Liang,GAO Ya-qian,LIN Zhong-sheng,WANG Hua 1.大连海洋大学水产与生命学院;2.国家海洋局近岸海域生态环境重点实验室,国家海洋环境监测中心;3.辽宁师范大学化学化工学院
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      An isotope dilution/gas chromatography-inductively coupled plasma mass spectrometric(ID/GC-ICP-MS)method was developed for the separation and determination of trace of methylmercury(MeHg)in seawater after an automatic distillation.Results showed that the distillation pretreatment for the seawater samples could be completed in 45 min using an automatic distillation apparatus,and BrCl solution was very efficient in removing the MeHg residues in the distillation ware,which could result in the procedural blank lowering markedly.The artificial MeHg during the distillation process might be negligible if the total mercury mass concentration in the sample was lower than 1.0 μg·L-1.The spiked recoveries for MeHg in seawater ranged from 98.2% to 122%,with RSDs for MeHg in natural seawater and spiked seawater of 16% and 5.4%,respectively,and the detection limits were 0.009 ng·L-1.The method was applied in the analysis of MeHg in the surface seawater collected from Dalian Bay with average MeHg concentration of (0.103±0.036) ng·L-1,and it could meet the requirements for analysis of trace methylmercury in coastal water.