应用电感耦合等离子体质谱法测定污灌白菜中的10种元素
Determination of 10 Elements in Sewage Irrigated Cabbage by Inductively Coupled Plasma Mass Spectrometry
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摘要:
目的 建立电感耦合等离子体质谱法（ICP-MS）的八级杆碰撞反应池技术，同时测定污灌区白菜中铬（Cr）、镍（Ni）、铜（Cu）、锌（Zn）、砷（As）、硒（Se）、钼（Mo）、镉（Cd）、汞（Hg）、铅（Pb）含量的方法。
方法 样品经微波消解，通过蠕动泵在线加入内标校正基体干扰和漂移及八级杆碰撞反应池消除质谱干扰，采用ICP-MS测定污灌区白菜中的10种元素。
结果 对于所测元素，相关系数均大于0.999 5，方法的检出限均小于1.96 μg/L，加标回收率为80.5%～119.8%，相对标准偏差（精密度）为0.93%～9.84%（
n =10）。污灌A区白菜中Cr、Zn、Hg、Pb含量高于对照区，污灌B区Cr、Zn、Hg、Pb含量高于对照区，差异均具有统计学意义（P < 0.05）。结论 可应用八级杆碰撞反应池ICP-MS同时测定污灌区白菜中的10种元素，该方法操作简便、快速、灵敏度高、重现性好。
Abstract:Objective To develop a method for simultaneous determination of Cr, Ni, Cu, Zn, As, Se, Mo, Cd, Hg, and Pb in sewage irrigated cabbage by inductively coupled plasma mass spectrometry (ICP-MS) with an octopole reaction system (ORS).
Methods Ten elements in after-microwave-digested sewage irrigated cabbage samples were directly determined by ICP-MS after using internal standard solution for elimination of non-spectroscopic interference and ORS for elimination of mass spectroscopic in terference.
Results The correlation coefficients were >0.999 5 for all elements detected, the detection limits of method were < 1.96 μg/L, the relative recoveries were 80.5%-119.8%, and the standard deviations were 0.93%-9.84% (
n =10). The contents of Cr, Zn, Hg, and Pb in the cabbage samples from A area were higher than those in the control samples (P < 0.05). The contents of Cr, Zn, Hg, and Pb in the cabbage samples from B area were higher than those in the control samples (P < 0.05).Conclusion This method using ORS and ICP-MS can be applied for simultaneous determination of ten elements in sewage irrigated cabbage, which is simple, sensitive, and accurate.
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