ICP-MS同时测定鱼肝油中21种重金属元素残留量

梁键谋; 王芸

doi:10.13748/j.cnki.issn1007-7693.2021.10.002

ICP-MS同时测定鱼肝油中21种重金属元素残留量

梁键谋,
王芸

Simultaneous Determination of Twenty-one Trace Heavy Metal Elements in Cod Liver Oil Using ICP-MS

摘要

摘要: 目的建立电感耦合等离子体质谱（ICP-MS）法同时测定鱼肝油中镉、铅、砷、汞、钴、钒、铀等21种重金属元素的分析方法。方法采用密闭超高压微波消解技术对样品进行彻底的物质消解，然后用5%硝酸溶液稀释后，采用ICP-MS对21种金属元素进行分析。应用八极杆碰撞/反应池（octopole reaction system，ORS）技术消除多原子离子对待测元素的干扰，并选用铟、锗、铋、钪等元素为内标混合液校正基体干扰和漂移。结果该方法各元素的检测限为0.000 2~0.554 3 µg·L^-1，相对标准偏差均<5.0%，通过添加标准回收试验，各元素回收率为90%~109%。结论该法快速、简便，灵敏，适用于鱼肝油中21种微量重金属元素的残留量的同时测定。

Abstract: OBJECTIVE To establish a method for simultaneous determination of 21 heavy metals(including Cd, Pb, As, Hg, Co, V, U and so on) in cod liver oil by inductively coupled plasma mass spectrometry(ICP-MS).METHODS Samples were decomposed in the ultra high pressure microwave digestion instrument, followed by dilution with 5% HNO₃ then the above 21 heavy metal elements in the solution were analyzed directly by ICP-MS.The use of octopole reaction system(ORS) could eliminate the interference of polyatomic ions dramatically.In, Ge, Bi and Sc were used to correct the matrix interference and drift.RESULTS The detection limits of the elements was in the range of 0.000 2–0.554 3 µg·L^-1, the relative standard deviation was <5.0% for all the elements, and the recovery rate of each element was 90%–109% by adding standard recovery experiment.CONCLUSION This method is rapid, simple, sensitive and applicable for the analysis of 21 trace heavy metal elements in cod liver oil.

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