Development of mercury chemical speciation:
Oxidized mercury in the atmosphere is a crucial link between gaseous elemental mercury emitted from human activity and mercury pollution in remote aquatic environments. The chemical forms of oxidized mercury formed from elemental mercury in the atmosphere will determine to a large part the rate at which mercury is removed from the atmosphere to natural waters. Current methods for the detection of oxidized mercury in the atmosphere provide only information concerning the total amount of mercury present in the atmosphere as oxidized mercury, not the chemical forms of oxidized mercury that are present. At 黑料不打烊, we have recently developed a technique to directly measure oxidized mercury. Further research will focus on refinement of the developed technique and its field implementation, with the focus on comparison of urban, remote continental and marine environments.
Ocean-atmosphere coupling of semi-)volatile organic matter and dissolved organic matter:
Snow/air and water/air interfaces are fascinating locations for chemical reactions. The nature of these interfaces and their roles in the exchange of chemicals, organic compounds in particular, are not well understood. Low molecular weight aldehydes and ketones in the surface oceans are produced by dissolved organic matter photochemistry or by biology, and can be transferred to the atmosphere, affecting its oxidative capacity. They thus link the organic carbon biogeochemistry of the atmosphere and the oceans. We have developed and optimized a mobile, economical and facile method, which allows for the simultaneous quantification of 23 C1 芒鈧�� C9 low molecular weight aldehydes and ketones in seawater, a well as in the gas phase. Detection limits range from 0.01 nM to 23.5 nM, depending on the compound, with sub-nanomolar detection limits achieved for most compounds in sea water, and we were involved in calculating the fluxes between atmosphere and Atlantic ocean surfaces. We have also developed methodology of quantification volatile and semi-volatile organic matter in snow that were tested in several field sites in the province of Quebec as well as two Arctic sites of Alert and Barrow (OASIS 2009). We were invited to several field measurement campaigns in the North Atlantic and the high Arctic (SOLAS and POLARSTERN), one in which we participated, and the other performed by two graduate students in our group. A substantial portion of the organic compounds in the snow is of biogenic origins, and we intend to learn more in this area, as our preliminary results are very promising and indicate that snow is indeed a photo-biochemical platform for release of volatile organic compounds.
Selected related publications in this domain
- E. Hudson, P. A. Ariya, and Y. Gelinas, A method for the simultaneous quantification of 23 C1-C9 trace aldehydes and ketones in seawater, Environmental Chemistry (2011) in press
- P. A. Ariya,A,B F. Domine,C G. Kos,B,H M. Amyot,D V. Cote,B H. Vali,E T. Lauzier,C W. F. Kuhs,F K. Techmer,F T. HeinrichsG and R. Mortazavi, Snow 芒鈧�� a photobiochemical exchange platform for volatile and semi-volatile organic compounds with the atmosphere, Environmental Chemistry (2010)
- G. Kos and P. A. Ariya, Volatile organic compounds in snow in the Quebec-Windsor Corridor JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 115, D01302, doi:10.1029/2009JD012391 (2010)
- E. D. Hudson, K. Okuda and P. A. Ariya, Determination of Acetone in Seawater Using Derivatization-Solid Phase Microextraction/, Analytical and Bioanalytical Chemistry/, DOI 10.1007/S0021-6-007-132X (2007)
- E. D. Hudson, and P. A. Ariya, Measurements of Non-Methane Hydrocarbons, DOC in Surface Ocean Waters, and aerosols over the Nordic Seas during Polarstern cruise ARK-XX/1, Chemosphere, DOI:10.1016/j./chemosphere./2007.04.056 (2007)
- A. B. Ryzhkov and P. A. Ariya, The importance of water clusters (H2O)n (n=2..4) in the reaction of Criegee intermediate with water in the atmosphere, Chemical Physics Letter, 419, 479-485 (2006)