title: Photochemical production of carbonyl sulfide, carbon disulfide and dimethyl sulfide in a lake water.
abstract: Photochemical production of carbonyl sulfide (COS), carbon disulfide (CS2) and dimethyl sulfide (DMS) was intensively studied in the water from the Aohai Lake of Beijing city. The lake water was found to be highly supersaturated with COS, CS2and DMS, with their initial concentrations of 0.91±0.073nmol/L, 0.55±0.071nmol/L and 0.37±0.062nmol/L, respectively. The evident photochemical production of COS and CS2in the lake water under irradiation of 365nm and 302nm indicated that photochemical production of them might be the reason for their supersaturation. The similar dependence of wavelength and oxygen for photochemical production of COS, CS2and DMS implied that they might be from the same precursors. The water cage effect was found to favor COS production but inhibit CS2and DMS formation, indicating that COS photochemical production was mainly from direct degradation of the precursors and the formation of CS2and DMS needed intermediates via combination of carbon-centered radicals and sulfur-centered radicals. The above assumptions were further confirmed by simulation experiments with addition of carbonyls and amino acids (cysteine and methionine), and the photochemical formation mechanisms for COS, CS2and DMS in water were derived from the investigations.
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: qqdu123@126.com.
authors.forename: Qianqian
authors.initials: Q
authors.lastname: Du
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: yjmu@rcees.ac.cn.
authors.forename: Yujing
authors.initials: Y
authors.lastname: Mu
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Chenglong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Liu
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Yuanyuan
authors.initials: Y
authors.lastname: Zhang
authors.affiliation: Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Chengtang
authors.initials: C
authors.lastname: Liu
mesh_terms: D000068476:Beijing; D002246:Carbon Disulfide / Q000737:chemistry*; D060106:Lakes / Q000737:chemistry*; D008956:Models, Chemical; D055668:Photochemical Processes; D013440:Sulfides / Q000737:chemistry*; D013461:Sulfur Oxides / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D013440:Sulfides; D013461:Sulfur Oxides; D014874:Water Pollutants, Chemical; C010063:carbonyl sulfide; C004784:dimethyl sulfide; D002246:Carbon Disulfide
keywords: Carbon disulfide; Carbonyl sulfide; Dimethyl sulfide; Photochemical production; Water