| Title: | Photosensitized degradation kinetics of trace halogenated contaminants in natural waters using membrane introduction mass spectrometry as an in situ reaction monitor |
| Author(s): | Letourneau DR; Gill CG; Krogh ET; |
| Address: | "Applied Environmental Research Laboratories, Department of Chemistry, Vancouver Island University, 900 Fifth Street, Nanaimo, BC V9R 5S5, Canada. Erik.Krogh@viu.ca and University of Victoria, Department of Chemistry, PO Box 3065, Stn CSC, Victoria, BC V8W 3V6, Canada" |
| ISSN/ISBN: | 1474-9092 (Electronic) 1474-905X (Linking) |
| Abstract: | "The photochemically mediated dechlorination of polyhalogenated compounds represents a potential decontamination strategy and a relevant environmental process in chemically reducing media. We report the UV irradiation of natural and artificial waters containing natural dissolved organic matter to effect the photo-sensitized degradation of chlorinated organic compounds, including tetrachloromethane, 1,1,1-tricloroethane, perchloroethene, 1,2-dibromo-3-chloropropane and chlorobenzene at trace (ppb) levels in aqueous solution. The degradation kinetics are followed in situ using membrane introduction mass spectrometry. By re-circulating the reaction mixture in a closed loop configuration over a semi-permeable hollow fiber polydimethylsiloxane membrane in a flow cell interface, volatile and semi-volatile compounds are continuously monitored using a quadrupole ion trap mass spectrometer. The time resolved quantitative information provides useful mechanistic insights, including kinetic data. Pseudo first-order rate constants for the degradation of contaminant mixtures in natural waters are reported" |
| Notes: | "PubMed-not-MEDLINELetourneau, Dane R Gill, Chris G Krogh, Erik T eng England 2015/10/07 Photochem Photobiol Sci. 2015 Nov; 14(11):2108-18. doi: 10.1039/c5pp00286a" |
