HR: 0830h
AN: B51C-0978    [PDF]
TI: Volatile Reduced Sulfur Compounds: Detection and Quantification in a Stratified Freshwater Lake
AU: * Mylon, S E
EM: steven.mylon@yale.edu
AF: Yale Environment School, Environmental Science Center 21 Sachem Street, New Haven, CT 06511 United States
AU: Hu, H
EM: haiying.hu@yale.edu
AF: Yale Environment School, Environmental Science Center 21 Sachem Street, New Haven, CT 06511 United States
AU: Benoit, G
EM: gaboury.benoit@yale.edu
AF: Yale Environment School, Environmental Science Center 21 Sachem Street, New Haven, CT 06511 United States
AB: It is now generally recognized that volatile reduced sulfur compounds (VRSCs), including hydrogen sulfide (H2S), carbon disulfide (CS2), methyl sulfide (MS), dimethyl sulfide (DMS), and dimethyl disulfide (DMDS) are significant constituents for atmospheric sulfur. Therefore, they play an important role in large-scale sulfur cycling. To date these compounds have been thoroughly investigated and quantified in open oceans and coastal marine environments. Additionally the export of VRSCs from marine surface waters to the atmosphere may implicate these compounds in global climate regulation. While current literature focuses on the biogeochemistry of VRSCs in marine systems, a comprehensive understanding of the global biogeochemistry of VRSCs necessitates more rigorous studies in freshwater environments. We will present concentration profiles of VRSCs in Linsley Pond, a stratified freshwater lake in Branford, CT. We developed an extremely sensitive methods for VSRCS measurements that relies on a purge-trap system coupled to gas chromatography with a pulsed flame photometric detector (PFPD). Using this method, we sampled Linsley Pond weekly to bimonthly during the initial stages of stratification in the spring and during mixing in the fall. Influence of the oxidation/reduction potential in the aquatic environment on the distribution of VRSCs over the complete water column and possible sources of VRSCs were also investigated.
DE: 1094 Instruments and techniques
DE: 1806 Chemistry of fresh water
DE: 1845 Limnology
SC: Biogeosciences [B]
MN: 2003 Fall Meeting