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Environ Sci Technol

Title:		"Indirect Photochemical Formation of Carbonyl Sulfide and Carbon Disulfide in Natural Waters: Role of Organic Sulfur Precursors, Water Quality Constituents, and Temperature"
Author(s):		Modiri Gharehveran M; Shah AD;
Address:		"Lyles School of Civil Engineering , Purdue University , West Lafayette , Indiana 47907 , United States. Division of Environmental and Ecological Engineering , Purdue University , West Lafayette , Indiana 47907 , United States"
Journal Title:		Environ Sci Technol
Year:		2018
Volume:		20180808
Issue:		16
Page Number:		9108 - 9117
DOI:		10.1021/acs.est.8b01618
ISSN/ISBN:		1520-5851 (Electronic) 0013-936X (Linking)
Abstract:		"Carbonyl sulfide (COS) and carbon disulfide (CS(2)) are volatile sulfur compounds that are critical precursors to sulfate aerosols, which enable climate cooling. COS and CS(2) stem from the indirect photolysis of organic sulfur precursors in natural waters, but currently the chemistry behind how this occurs remains unclear. This study evaluated how different organic sulfur precursors, water quality constituents, which can form important reactive intermediates (RIs), and temperature affected COS and CS(2) formation. Nine natural waters ranging in salinity were spiked with cysteine, cystine, dimethylsulfide (DMS), or methionine and exposed to simulated sunlight over varying times and water quality conditions. Results indicated that COS and CS(2) formation increased up to 11x and 4x, respectively, after 12 h of sunlight, while diurnal cycling exhibited varied effects. COS and CS(2) formation was also strongly affected by the DOC concentration, organic sulfur precursor type, O(2) concentration, and temperature, while salinity differences and CO addition did not play a significant role. Overall, important factors in forming COS and CS(2) were identified, which may ultimately impact their atmospheric concentrations"
Keywords:		*Carbon Disulfide Photochemical Processes Sulfur Sulfur Oxides Temperature Water Quality;
Notes:		"MedlineModiri Gharehveran, Mahsa Shah, Amisha D eng Research Support, Non-U.S. Gov't 2018/07/26 Environ Sci Technol. 2018 Aug 21; 52(16):9108-9117. doi: 10.1021/acs.est.8b01618. Epub 2018 Aug 8"