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首页> 外文期刊>Environmental Science & Technology >Indirect Photochemical Formation of Carbonyl Sulfide and Carbon Disulfide in Natural Waters: Role of Organic Sulfur Precursors, Water Quality Constituents, and Temperature
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Indirect Photochemical Formation of Carbonyl Sulfide and Carbon Disulfide in Natural Waters: Role of Organic Sulfur Precursors, Water Quality Constituents, and Temperature

机译：天然水中羰基硫和二硫化碳的间接光化学形成：有机硫前体，水质成分和温度的作用

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摘要

Carbonyl sulfide (COS) and carbon disulfide (CS2) are volatile sulfur compounds that are critical precursors to sulfate aerosols, which enable climate cooling. COS and CS2 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 CS2 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 CS2 formation increased up to 11x and 4x, respectively, after 12 h of sunlight, while diurnal cycling exhibited varied effects. COS and CS2 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 CS2 were identified, which may ultimately impact their atmospheric concentrations.
机译：羰基硫化物（COS）和二硫化碳（CS2）是挥发性的硫化合物，它们是硫酸盐气溶胶的关键前体，可以使气候变凉。 COS和CS2源自天然水中有机硫前体的间接光解作用，但目前尚不清楚其背后的化学反应。这项研究评估了不同的有机硫前体，水质成分（可以形成重要的反应性中间体（RI））和温度如何影响COS和CS2的形成。在盐度不等的九个天然水中掺入半胱氨酸，胱氨酸，二甲基硫醚（DMS）或蛋氨酸，并在不同的时间和水质条件下暴露于模拟阳光下。结果表明，日光照射12小时后，COS和CS2的形成分别增加了11倍和4倍，而昼夜循环表现出不同的影响。 DOC浓度，有机硫前体类型，O-2浓度和温度也强烈影响COS和CS2的形成，而盐度差异和CO的添加没有显着影响。总体而言，确定了形成COS和CS2的重要因素，这可能最终影响它们的大气浓度。

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  • 来源
    《Environmental Science & Technology》 |2018年第16期|9108-9117|共10页
  • 作者

    Gharehveran Mahsa Modiri; Shah Amisha D.;

  • 作者单位

    Purdue Univ, Lyles Sch Civil Engn, W Lafayette, IN 47907 USA;

    Purdue Univ, Lyles Sch Civil Engn, W Lafayette, IN 47907 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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