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Photochemistry of reduced sulfur compounds in a landfill environment [An article from: Atmospheric Environment]
Description
This digital document is a journal article from Atmospheric Environment, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
This study examines the distribution characteristics of reduced sulfur compounds (RSCs such as DMS, CS"2, H"2S, DMDS, and CH"3SH) and their photochemical reactions in landfill air. The photochemical conversions of RSCs to a further oxidized form, SO"2 were evaluated in the landfill site using a photochemical box model. Measurements of RSCs were carried out from landfill areas in Daegu, Korea, during a wintertime period (e.g., 13-16 Jan 2004). This study indicated that H"2S was the most dominant RSC in the landfill, with the concentrations of 4.2+/-5.8ppbv. The chemical species of RSCs, which may exert influences on the SO"2 production depending on sampling conditions, were found to include DMS, DMDS, and H"2S. In general, the RSC contribution to the observed SO"2 levels was insignificant in the sampling sites investigated. Overall, the extent of the RSC oxidation to the observed SO"2 varied dramatically during the sampling period. The photochemical conversion of the RSCs in the landfill environment can account for about 15% of the observed SO"2, on average. There was a strong correlation between DMS and SO"2 concentration levels during the study period.
Description:
This study examines the distribution characteristics of reduced sulfur compounds (RSCs such as DMS, CS"2, H"2S, DMDS, and CH"3SH) and their photochemical reactions in landfill air. The photochemical conversions of RSCs to a further oxidized form, SO"2 were evaluated in the landfill site using a photochemical box model. Measurements of RSCs were carried out from landfill areas in Daegu, Korea, during a wintertime period (e.g., 13-16 Jan 2004). This study indicated that H"2S was the most dominant RSC in the landfill, with the concentrations of 4.2+/-5.8ppbv. The chemical species of RSCs, which may exert influences on the SO"2 production depending on sampling conditions, were found to include DMS, DMDS, and H"2S. In general, the RSC contribution to the observed SO"2 levels was insignificant in the sampling sites investigated. Overall, the extent of the RSC oxidation to the observed SO"2 varied dramatically during the sampling period. The photochemical conversion of the RSCs in the landfill environment can account for about 15% of the observed SO"2, on average. There was a strong correlation between DMS and SO"2 concentration levels during the study period.
