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首页> 外文期刊>Environmental Science & Technology >Photochemical Alteration of Dissolved Organic Sulfur from Sulfidic Porewater
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Photochemical Alteration of Dissolved Organic Sulfur from Sulfidic Porewater

机译：硫化废水中溶解有机硫的光化学变化

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摘要

Sulfidic sediments are a source of dissolved organic sulfur (DOS) to the ocean but the fate of sedimentary DOS in the oxic, sunlit water column is unknown. We hypothesized that photodegradation after discharge from the dark sedimentary environment results in DOS molecular transformation and decomposition. To test this hypothesis, sulfidic porewater from a saltmarsh was exposed to potential abiotic transformations of dissolved organic matter (DOM) in the water column. We quantitatively investigated DOM transformations via elemental analysis and molecularly via ultrahigh-resolution mass spectrometry. Our study indicated that photoreactivity is dependent on DOM elemental composition as DOS molecular formulas were more photolabile than those without sulfur. Prior to solar irradiation, of the 6451 identified molecular formulas in sulfidic porewater, 39% contained sulfur. After 29 days of irradiation, the DOS concentration was depleted from 13 to 1 mu M, together with a 9% decrease in the number of DOS molecular formulas. Comparing porewater and oceanic DOS molecular formulas, solar irradiation increased the similarity due to the removal of photolabile DOS formulas not present in the ocean. In conclusion, DOS from sulfidic sediments is preferentially photolabile and solar irradiation can be a potential mechanism controlling the stability and fate of porewater DOS.
机译：硫化物沉积物是海洋中溶解的有机硫（DOS）的来源，但尚不清楚在有氧，阳光照射的水柱中沉积DOS的命运。我们假设从黑暗沉积环境中排放后的光降解会导致DOS分子转化和分解。为了验证这一假设，将盐沼中的硫化孔隙水暴露于水柱中潜在的非生物溶解性有机物（DOM）转化中。我们通过元素分析和超高分辨率质谱对分子进行了定量研究。我们的研究表明，光化学反应性取决于DOM元素组成，因为DOS分子式比不具有硫的分子式更具光不稳定性。在太阳辐照之前，在硫化孔隙水中的6451种确定的分子式中，有39％含有硫。照射29天后，DOS浓度从13减少到1μM，同时DOS分子式数量减少了9％。比较孔隙水和海洋DOS分子式，由于去除了海洋中不存在的对光不稳定的DOS式，太阳辐射增加了相似性。总之，来自硫化物沉积物的DOS优先具有光不稳定性，太阳辐射可能是控制孔隙水DOS稳定性和命运的潜在机制。

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  • 来源
    《Environmental Science & Technology》 |2017年第24期|14144-14154|共11页
  • 作者

    Gomez-Saez Gonzalo V.; Pohlabeln Anika M.; Stubbins Aron; Marsay Chris M.; Dittmar Thorsten;

  • 作者单位

    Carl von Ossietzky Univ Oldenburg, Res Grp Marine Geochem, ICBM MPI Bridging Grp, Inst Chem & Biol Marine Environm, D-26111 Oldenburg, Germany;

    Carl von Ossietzky Univ Oldenburg, Res Grp Marine Geochem, ICBM MPI Bridging Grp, Inst Chem & Biol Marine Environm, D-26111 Oldenburg, Germany;

    Univ Georgia, Skidaway Inst Oceanog, Dept Marine Sci, Savannah, GA 30602 USA;

    Univ Georgia, Skidaway Inst Oceanog, Dept Marine Sci, Savannah, GA 30602 USA;

    Carl von Ossietzky Univ Oldenburg, Res Grp Marine Geochem, ICBM MPI Bridging Grp, Inst Chem & Biol Marine Environm, D-26111 Oldenburg, Germany;

  • 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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