| Title: | Thermal decomposition of captan and formation pathways of toxic air pollutants |
| Author(s): | Chen K; Mackie JC; Kennedy EM; Dlugogorski BZ; |
| Address: | "Process Safety and Environmental Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, New South Wales 2308, Australia" |
| ISSN/ISBN: | 0013-936X (Print) 0013-936X (Linking) |
| Abstract: | "This study investigates the thermal decomposition of a widely used fungicide, captan, under gas phase conditions, similar to those occurring in fires, cigarette burning, and combustion of biomass treated or contaminated with pesticides. The laboratory-scale apparatus consisted of a plug flow reactor equipped with sampling trains for gaseous, volatile organic compounds (VOC) and condensed products, with analysis performed by Fourier transform infrared spectroscopy (FTIR) and gas chromatography-mass spectrometry (GC-MS), respectively. Under oxidative conditions, the thermal decomposition of captan generated gaseous pollutants including carbon disulfide, thiophosgene, phosgene, and hydrogen cyanide. The VOC analysis revealed the formation of tetrachloroethylene, hexachloroethane, and benzonitrile. Quantum chemical calculations indicated that captan decomposes unimolecularly, via fission of the C-S bond, with the ensuing radicals reacting with O(2). The results of the present study provide an improved understanding of the formation pathways of toxic air pollutants in the accidental or deliberate combustion of captan" |
| Keywords: | "Air Pollutants/*chemistry Captan/*chemistry Fungicides, Industrial/*chemistry Gas Chromatography-Mass Spectrometry Limit of Detection Spectroscopy, Fourier Transform Infrared;" |
| Notes: | "MedlineChen, Kai Mackie, John C Kennedy, Eric M Dlugogorski, Bogdan Z eng Research Support, Non-U.S. Gov't 2010/05/04 Environ Sci Technol. 2010 Jun 1; 44(11):4149-54. doi: 10.1021/es9037935" |
