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Determination of trace heavy metal elements in fish oil using ICP-MS

Liang Fu

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Abstract

An octopole reaction system(ORS) inductively coupled plasma mass spectrometry(ICP-MS) was developed for the determination of Cr, Co, Ni, As, Mo, Cd, Sn, Sb, Hg and Pb in fish oil. Samples were decomposed by HNO 3 and H2 O2 followed by dilution with ultrapure water then the above 10 heavy metal elements in the solution were analyzed directly by ICP-MS. The use of ORS can eliminate the interference of polyatomic ions dramatically. Sc, Rh and Bi were used to correct the matrix interference and drift. The detection limits of the 10 elements was in the range of 0.008～0.073 μg/L, the relative standard deviation was less than 4.4% for all the elements, and the recovery was 89.6%～103.8% by adding standard recovery experiment. This method was rapid, simple and applicable for the analysis of trace heavy metal elements in fish oil.

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What this paper is about

An octopole reaction system(ORS) inductively coupled plasma mass spectrometry(ICP-MS) was developed for the determination of Cr, Co, Ni, As, Mo, Cd, Sn, Sb, Hg and Pb in fish oil. Samples were decomposed by HNO 3 and H2 O2 followed by dilution with ultrapure water then the above 10 heavy metal elements in the solution were analyzed directly by ICP-MS. The use of ORS can eliminate the interference of polyatomic ions dramatically. Sc, Rh and Bi were used to correct the matrix interference and drift. The detection limits of the 10 elements was in the range of 0.008～0.073 μg/L, the relative standard deviation was less than 4.4% for all the elements, and the recovery was 89.6%～103.8% by adding standard recovery experiment. This method was rapid, simple and applicable for the analysis of trace heavy metal elements in fish oil.

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Available abstract

An octopole reaction system(ORS) inductively coupled plasma mass spectrometry(ICP-MS) was developed for the determination of Cr, Co, Ni, As, Mo, Cd, Sn, Sb, Hg and Pb in fish oil. Samples were decomposed by HNO 3 and H2 O2 followed by dilution with ultrapure water then the above 10 heavy metal elements in the solution were analyzed directly by ICP-MS. The use of ORS can eliminate the interference of polyatomic ions dramatically. Sc, Rh and Bi were used to correct the matrix interference and drift. The detection limits of the 10 elements was in the range of 0.008～0.073 μg/L, the relative standard deviation was less than 4.4% for all the elements, and the recovery was 89.6%～103.8% by adding standard recovery experiment. This method was rapid, simple and applicable for the analysis of trace heavy metal elements in fish oil.

Key concepts: Ultrapure water, Inductively coupled plasma mass spectrometry, Chemistry, Polyatomic ion, Dilution, Analytical Chemistry (journal), Metal, Metal ions in aqueous solution

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