Inductively Coupled Plasma-Mass Spectrometric Analysis of Mercury in Biological Samples and Interference Correction Methods

ZHANG Linghuo; MA Na; CHEN Haijie; ZHANG Pengpeng; HU Mengying; XU Jinli; BAI Jinfeng

doi:10.15898/j.ykcs.202407020145

Rock and Mineral Analysis > 2025 > 44(1): 140-148. > DOI: 10.15898/j.ykcs.202407020145

ZHANG Linghuo，MA Na，CHEN Haijie，et al. Inductively Coupled Plasma-Mass Spectrometric Analysis of Mercury in Biological Samples and Interference Correction Methods[J]. Rock and Mineral Analysis，2025，44（1）：140−148. DOI: 10.15898/j.ykcs.202407020145

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Inductively Coupled Plasma-Mass Spectrometric Analysis of Mercury in Biological Samples and Interference Correction Methods

ZHANG Linghuo^{1, 2,},
MA Na^{1, 2, ,},
CHEN Haijie^{1, 2},
ZHANG Pengpeng^{1, 2},
HU Mengying^{1, 2},
XU Jinli^{1, 2},
BAI Jinfeng^{1, 2}

1.
Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, China
2.
Key Laboratory of Geochemical Exploration, Ministry of Natural Resources, Langfang 065000, China

More Information

Received Date: July 01, 2024
Revised Date: August 22, 2024
Accepted Date: August 25, 2024
Available Online: September 25, 2024
Published Date: September 24, 2024

Abstract

HIGHLIGHTS
(1) Hg is difficult to determine by ICP-MS in biological samples directly and accurately due to high ionization energy, low ionization efficiency and interference from polyatomic ions, such as tungsten oxides or hydroxides.

(2) The interference amount of W with Hg was linearly related to the concentration of W. It was proposed to minimize the mass spectral interferences of W by using the KED mode combined with mathematical correction.

(3) The matrix interference was eliminated with internal standard (Rh concentration of 50μg/L) and sample dilution (dilution of 100 times), and the detection limit was 1.2ng/g.

ABSTRACT

It is difficult to directly and accurately determine Hg in biological samples using inductively coupled plasma-mass spectrometry (ICP-MS) due to polyatomic interferences, such as tungsten oxide, and matrix effects. We established an ICP-MS method for the determination of Hg in biological samples based on the kinetic energy discrimination (KED) mode combined with mathematical correction and internal standard correction. In this experiment, spectral interferences of Hg in standard (STD) mode and KED mode were investigated. ²⁰²Hg was selected as the analyzed isotope in the KED mode, effectively reducing but not completely eliminating the interference. It was found that the interference amount of W with Hg was linearly related to the concentration of W (R²=0.9997). The matrix interference was eliminated with internal standard (Rh concentration of 50μg/L) and sample dilution (dilution of 100 times). The reliability of the method was tested with 9 reference materials, and the results were in agreement with certified values (or reference values). In particular, the accuracy of GBW10028 (Astragalus membranaceus), GBW10025 (spirulina) and GBW10015a (spinach) was significantly improved. The relative standard deviation (n=10) was 0.7% to 7.0%. The method is suitable for the analysis of Hg in biological samples.
- biological sample,
- mercury,
- inductively coupled plasma-mass spectrometry,
- interference correction

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References (34)

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Inductively Coupled Plasma-Mass Spectrometric Analysis of Mercury in Biological Samples and Interference Correction Methods