SS4.06 Speciation, Bioavailability, and Impacts of Atmospheric Trace Metals in Aquatic Systems
Date: Wednesday, June 12, 2002
Time: 4:45:00 PM
Location: Esquimalt
 
ShadeCW, University of Illinois, Urbana, IL, USA, cwshade@uiuc.edu
Hudson, R, J, University of Illinois, Urbana, IL, USA, rjhudson@uiuc.edu
Hintelmann, H, , Trent University, Peterborough, ON, Canada, hhintelmann@trentu.ca
 
A NOVEL HPLC-FIA SYSTEM FOR RAPID PRE-CONCENTRATION, SPECIATION AND DETECTION OF INORGANIC AND MONMETHYLMERCURY IN ENVIRONMENTAL WATER SAMPLES
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The difficulty and cost of determining mercury speciation in aqueous samples has arguably limited the progress of mercury biogeochemistry research. While great strides have been made over the last decade using the current state-of-the-art methods -- stannous chloride reduction and dual gold amalgamation and/or direct aqueous ethylation or distillation/ethylation with purge-and-trap, GC speciation, and CVAFS detection -- they are very time-consuming and thus costly. Several HPLC-based systems for on-line speciation and quantification of Hg have been proposed over the years but none have managed to surmount all of the obstacles inherent in environmental analysis, particularly trace-level detection and matrix interferences. We have developed a new method for rapid HPLC-FIA based pre-concentration, speciation, and detection by CVAFS or ICP/MS of trace levels of inorganic- and monomethylmercury in environmental water samples. A full description of the method and performance of the on-line system, including detection limits and recoveries from low –DOC and humic-rich waters, will be presented.