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Isotopic fractionation of mercury induced by reduction and ethylation
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Journal Article
Isotopic fractionation of mercury induced by reduction and ethylation
2009
Overview
Isotope ratio measurements characterizing ²⁰²Hg/²⁰⁰Hg in NIST SRM 3133 Mercury Standard Solution were undertaken by multicollector inductively coupled plasma mass spectrometry employing NIST SRM 997 Tl for mass bias correction by use of the slope and the intercept obtained from a natural logarithmic plot of each session of measurements of ²⁰²Hg/²⁰⁰Hg against ²⁰⁵Tl/²⁰³Tl. The calculated value of 1.285333 ± 0.000192 (mean and one standard deviation, n = 40) for the mass bias corrected ²⁰²Hg/²⁰⁰Hg was then used for mass bias correction of other Hg isotope pairs. Ratios of 0.015337 ± 0.000011, 1.68770 ± 0.00054, 2.3056 ± 0.0015, 1.3129 ± 0.0013, 2.9634 ± 0.0038, and 0.67937 ± 0.0013 (expanded uncertainty, k = 2) were obtained for ¹⁹⁶Hg/¹⁹⁸Hg, ¹⁹⁹Hg/¹⁹⁸Hg, ²⁰⁰Hg/¹⁹⁸Hg, ²⁰¹Hg/¹⁹⁸Hg, ²⁰²Hg/¹⁹⁸Hg, and ²⁰⁴Hg/¹⁹⁸Hg, respectively. Reduction of Hg(II) to Hg⁰ in solutions of SRM 3133 was then undertaken using SnCl₂, NaBH₄, UV photolysis in the presence of formic acid, and ethylation of Hg(II) using NaBEt₄. These reactions induced significant isotope fractionation with maximum values of 1.17 ± 0.07, 1.08 ± 0.09, 1.34 ± 0.07, and 3.59 ± 0.09[per thousand] (one standard deviation, 1SD, n = 5) for δ ²⁰²/¹⁹⁸Hg relative to the initial isotopic composition in the solution following 85-90% reduction of the Hg by SnCl₂, NaBH₄, UV photolysis, and ethylation with NaBEt₄, respectively. Mass-dependent fractionation was found to be dominant for all reduction processes. [graphic removed]
Publisher
Berlin/Heidelberg : Springer-Verlag,Springer-Verlag,Springer
Subject
/ Bias
/ Characterization and Evaluation of Materials
/ Chemistry and Materials Science
/ Ethylmercury Compounds - chemical synthesis
/ Ethylmercury Compounds - chemistry
/ Exact sciences and technology
/ Isotopes
/ Mass-independent fractionation
/ Mercury
/ Monitoring/Environmental Analysis
/ Multicollector inductively coupled plasma mass spectrometry
