在线稀释/预浓缩-电感耦合等离子体质谱法分析海水中11种痕量元素

Determination of Trace Metals(Cr,Mo,Cu,Pb,Zn,Cd,Fe,Mn,Ni,V,Co) in Seawater by Inductively Coupled Plasma Mass Spectrometry with On-line Injection Technique

建立了一种在线进样技术,包括在线稀释和在线预浓缩两种模式,电感耦合等离子体质谱法（ICPMS）直接测定海水中Cr,Mo,Cu,Pb,Zn,Cd,Fe,Mn,Ni,V,Co等11种痕量重金属的分析方法。此方法可自动稀释制作标准曲线,自动基体匹配,通过在线稀释及在线预浓缩两种模式,直接分析海水中11种痕量重金属。方法自动化程度高,分析CASS-5和NASS-6海水标样,结果准确。实际海水样品加标回收率范围为80%~115%。海水中11种金属元素的方法定量限（μg/L）分别为0.06（Cr）,0.06（Mo）,0.01（Cu）,0.005（Pb）,0.01（Zn）,0.006（Cd）,0.03（Fe）,0.02（Mn）,0.01（Ni）,0.01（V）,0.01（Co）。方法被用于分析浙江沿海不同盐度海水样品重金属分析,分析结果与传统原子吸收方法结果一致。

An analytical method of on-line injection technique including on-line dilution and on-line preconcentration with inductively coupled plasma mass spectrometry （ICP-MS） was established for the determination of trace metals in seawater, such as Cr, Mo, Cu, Pb, Zn, Cd, Fe, Mn, Ni, V, Co. This method could automatically make standard curves and match matrix, and by the on-line dilution and preconcentration modes, 11 trace metals could be analyzed directly. With high-level automation, CASS-5 and NASS-6 seawater standard samples were analyzed accurately by this method. The recovery of metals in seawater sample addition was between 80% and 115%. The method quantitation limits （μg/L） of theses metals in seawater were 0.06（Cr） , 0.06（ Mo）, 0.01 （ Cu）, 0.005 （ Pb）, 0.01 （ Zn）, 0. 006（Cd） , 0.03 （Fe）, 0.02（Mn）, 0.01 （ Ni）, 0.01 （V）, and 0.01 （Co）, respectively. This method was applied to analyze seawater samples of various salinities in Zhejiang coast, and the analysis results were consistent with results of conventional atomic absorption method.