PMID: 15382859Sep 24, 2004Paper

Product study of the gas-phase BrO-initiated oxidation of Hg0: evidence for stable Hg1+ compounds

Environmental Science & Technology
Farhad Raofie, Parisa A Ariya

Abstract

Mercury is a key toxic environmental pollutant, and its speciation affects its bioavailability. BrO radicals have been identified as key oxidants during mercury depletion events observed in Arctic and sub-Arctic regions. We report the first experimental product study of BrO-initiated oxidation of elemental mercury at atmospheric pressure of ca. 0.987 bar and T= 296+/-2 K. We used chemical ionization and electron impact mass spectrometry, gas chromatography coupled to a mass spectrometer, a MALDI-TOF mass spectrometer, a cold vapor atomic fluorescence spectrometer, and high-resolution transmission electron microscopy coupled to energy dispersive spectrometry. BrO radicals were formed using visible and UV photolysis of Br2 and CH2Br2 in the presence of ozone. We have analyzed the products in the gas phase, on suspended aerosols and on wall deposits, and identified HgBr, HgBrO/HgOBr, and HgO as reaction products. Mercury aerosols with a characteristic width of ca. 0.2 microm were observed as products. We herein discuss the implications of our results to the chemistry of atmospheric mercury and its potential implications in the biogeochemical cycling of mercury.

References

Apr 12, 2002·Environmental Science & Technology·Ralf EbinghausWilliam H Schroeder
Apr 12, 2002·Environmental Science & Technology·Steve E LindbergAndreas Richter
Feb 13, 2003·Chemical Reviews·Michael Karas, Ralf Krüger

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Citations

May 6, 2014·The Science of the Total Environment·Athanasios G MegaritisSpyros N Pandis
Jan 4, 2007·FEMS Microbiology Ecology·Tamar Barkay, Alexandre J Poulain
Oct 29, 2008·Physical Chemistry Chemical Physics : PCCP·Graydon SniderParisa A Ariya
Jul 26, 2019·Scientific Reports·Avik J Ghoshdastidar, Parisa A Ariya
Dec 20, 2019·Analytical and Bioanalytical Chemistry·Avik J GhoshdastidarParisa A Ariya
Apr 6, 2007·Ambio·Steve LindbergUNKNOWN Panel on Source Attribution of Atmospheric Mercury
Jun 28, 2007·The Journal of Physical Chemistry. a·Benjamin C SheplerKirk A Peterson
Nov 3, 2006·The Journal of Physical Chemistry. a·Benjamin C Shepler, Kirk A Peterson
Aug 31, 2017·Environmental Science & Technology·Thomas A DouglasRomain Prevost
Dec 4, 2004·Environmental Science & Technology·Biswajit Pal, Parisa A Ariya
Jul 13, 2006·The Journal of Physical Chemistry. a·Nikolai B BalabanovKirk A Peterson

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