Ultra-trace determination of mercury in water by cold-vapor generation isotope dilution mass spectrometry

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DOIResolve DOI: http://doi.org/10.1039/b506695f
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TypeArticle
Journal titleJournal of Analytical Atomic Spectrometry
ISSN0267-9477
Volume20
Issue11
Pages12261231; # of pages: 6
AbstractDetermination of total Hg at the ppt level in water using cold vapor generation and inductively coupled plasma mass spectrometry for calibration by isotope dilution (ID) with both sector field (SF-ICP-MS) and time-of-flight MS (ICP-TOF-MS) detection is described. Samples were reduced on-line in a flow injection manifold with SnCl2 to generate Hg vapor for both steady-state and transient sample introduction following gold trapping. No significant difference in final Hg concentrations was detected using either approach. Certified reference material ORMS-3 river water (NRCC, Ottawa, Canada) was used for method validation. Mercury concentrations of 12.75 ± 0.24 and 12.34 ± 0.11 pg g−1 (mean and one standard deviation, n = 4) were obtained using steady-state generation with SF-ICP-MS and ICP-TOF-MS, respectively, in agreement with the certified value of 12.6 ± 1.1 pg g−1 (combined uncertainty, k = 2). Concentrations of 12.55 ± 0.41 and 12.65 ± 0.30 pg g−1 (one standard deviation, n = 4) were obtained following gold trapping and SF-ICP-MS and ICP-TOF-MS detection, respectively. Compared with SF-ICP-MS, a 2-fold enhancement in the precision of the measured 200Hg/201Hg and 202Hg/201Hg ratios in a 100 ppt Hg standard solution was obtained using ICP-TOF-MS. Consequently, improved precisions of 0.87–2.33% RSD in Hg concentrations obtained by steady-state and transient signal acquisition, respectively, in ORMS-3 were obtained using ICP-TOF-MS, compared with 1.88–3.25% RSD obtained with SF-ICP-MS. Method detection limits (LODs, three times standard deviation) of 0.024 and 0.15 pg g−1 for Hg using direct CV and following gold trapping, respectively, were obtained using SF-ICP-MS. These were superior to corresponding LODs of 0.30 and 0.87 pg g−1 obtained using ICP-TOF-MS as a result of its 15-fold lower sensitivity.
Publication date
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; National Research Council Canada
Peer reviewedNo
Identifier10391186
NRC number2601
NPARC number8898017
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Record identifierb38065d7-597a-4620-95b9-95226aba6537
Record created2009-04-22
Record modified2016-05-09
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