Hg isotopic ratios of NIES CRM No. 13 Human Hair were analyzed using cold vapor generation coupled to multi-collector inductively coupled plasma mass spectrometer to meet the growing demand for better understanding of Hg exposure routes by using Hg isotopic compositions in human hair samples. To validate and assure the accuracy of our analytical method, (1) the reproducibility of the Hg isotopic measurement was monitored and (2) the Hg isotopic compositions of four secondary reference materials—IAEA-085, IAEA-086, and CRPG-RL24H—were measured. Our results for NIES CRM No. 13 show the mass-dependent fractionation values of δ199Hg = (2.13 ± 0.07) ‰, δ200Hg = (0.98 ± 0.08) ‰, δ201Hg = (2.77 ± 0.10) ‰, δ202Hg = (1.89 ± 0.10) ‰, and δ204Hg = (2.76 ± 0.16) ‰ (2SD, n = 11) and the mass-independent fractionation values of Δ199Hg = (1.65 ± 0.06) ‰, Δ200Hg = (0.04 ± 0.04) ‰, Δ201Hg = (1.36 ± 0.07) ‰, and Δ204Hg = (−0.04 ± 0.11) ‰ (2SD,n = 11). Interlaboratory comparison of the CRM performed at the University of Pau showed good agreement with the values obtained at NIES.
Hg isotopes Human hair CRM CV-MC-ICP-MS
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We would like to thank N. Estrade from CRPG for providing CRPG-RL24H. We also thank M. Nishikawa, M. Sano and J. Yoshinaga for discussions.