NDLI: Determination of inorganic selenium species in rain and sea waters by anion exchange chromatography-hydride generation-inductively-coupled plasma-dynamic reaction cell-mass spectrometry (AEC-HG-ICP-DRC-MS)

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Determination of inorganic selenium species in rain and sea waters by anion exchange chromatography-hydride generation-inductively-coupled plasma-dynamic reaction cell-mass spectrometry (AEC-HG-ICP-DRC-MS)

Content Provider	Royal Society of Chemistry (RSC)
Author	London, Jacqueline Wallschläger, Dirk
Copyright Year	2004
Abstract	The inorganic selenium (Se) species selenite, selenate and selenocyanate in waters are determined by anion exchange chromatography-hydride generation-inductively-coupled plasma-dynamic reaction cell-mass spectrometry (AEC-HG-ICP-DRC-MS) with instrumental detection limits of 0.15, 0.27 and 0.19 ng Se L−1, respectively. Sea water has to be diluted ten-fold prior to analysis to overcome chromatographic interferences, so practical method detection limits for this matrix are around 2–3 ng Se L−1. The species are separated by gradient elution with NaOH and converted to SeH2 by prereduction with iodide in HCl at 100 °C, followed by subsequent reaction with KBH4, before the SeH2 is introduced into the plasma after aerosol and water vapor removal. Quantification using the main Se isotope 80Se was possible by employing, for the first time, a mixture of two reaction gases: methane for eliminating the 40Ar2+ dimer, and ammonia for eliminating a significant interference from HBr+ caused by bromine present in the employed reagents. Oxidation of Se+ to SeO+ using O2 as the reaction gas was also attempted, but yielded incomplete (10–25%) conversion. In addition, the HBr+ interference was not eliminated by this approach, because the interfering molecular ion was also oxidized to HBrO+. The optimized method was successfully applied to the determination of Se speciation in uncontaminated sea water and in rain water. In rain water, an unidentified Se species was detected, which we believe to be a monomethylated Se species.
Starting Page	1119
Ending Page	1127
Page Count	9
File Format	HTM / HTML PDF
ISSN	02679477
Volume Number	19
Issue Number	9
Journal	Journal of Analytical Atomic Spectrometry
DOI	10.1039/b401616e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Selenium Selenate Potassium selenocyanate Ion Chromatography Mitochondrial matrix Iodide Hydrochloric acid Blood plasma Aerosol Isotope Methane Protein dimer Ammonia Bromine Search engine optimization Oxygen Speciation
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Analytical Chemistry

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Determination of inorganic selenium species in rain and sea waters by anion exchange chromatography-hydride generation-inductively-coupled plasma-dynamic reaction cell-mass spectrometry (AEC-HG-ICP-DRC-MS)

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