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首页> 外文期刊>Environmental Science & Technology >Photochemical Production and Photolysis of Acrylate in Seawater
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Photochemical Production and Photolysis of Acrylate in Seawater

机译：海水中丙烯酸酯的光化学生产和光解

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摘要

The marine organosulfur cycle has been studied intensively for over 30 years motivated by the hypothesis that dimethylsulfide (DMS) affects Earth's radiation balance and climate. The main source of DMS is from the enzymatic lysis of dimethylsulfoniopropionate(DMSP),thelatter of which is a significant component of carbon, sulfur, and energy fluxes in the oceans. Acrylate is also produced during DMSP lysis, but unlike DMS or DMSP, very little is known about the marine acrylate cycle. Herein, a new source of acrylate was identified in seawater as a product formed from the photolysis of dissolved organic matter (DOM). Photochemical production rates varied from 1.6 to 5.0 pM (μmo quanta cm~(-2))~(-1), based on photon exposures determined from nitrite actinometry. A positive correlation (r = 0.87) was observed between acrylate photoproduction and the seawater absorption coefficient at 330 nm. Acrylate photoproduction was initiated by UV radiation, with UV-B and UV-A contributing approximately 32 and 68% to the total production, respectively. Acrylate did not photolyze in high-purity water or seawater at concentrations less than 100 nM. These findings improve our understanding of the role that sunlight plays in the marine acrylate cycle, a reactive form of DOM that significantly affects the carbon cycle and ecology of the upper ocean.
机译：海洋有机硫循环已被密集地研究超过30年，其假设是二甲基硫化物（DMS）影响地球的辐射平衡和气候。 DMS的主要来源来自二甲基磺基丙酸二甲基丙酸（DMSP）的酶促裂解，其中Thelater是海洋中碳，硫和能量通量的重要组成部分。在DMSP裂解期间也产生丙烯酸酯，但与DMS或DMSP不同，关于海洋丙烯酸酯循环很少。在此，作为由溶解的有机物质（DOM）的光解形成的产物，在海水中鉴定了丙烯酸酯的新来源。基于从亚硝酸盐静脉测定法确定的光子曝光，光化学生产率从1.6到5.0 PM（μMO Quanta cm〜（-2））〜（-1）变化。在丙烯酸​​酯光保护和330nm处的海水吸收系数之间观察到正相关（R = 0.87）。通过UV辐射引发丙烯酸酯光洗脱，用UV-B和UV-a促进约32和68％的总产量。丙烯酸酯在低于100nm的浓度下在高纯度水或海水中进行光解。这些调查结果改善了我们对阳光在海洋丙烯酸酯周期中发挥的作用的理解，一种显着影响上海碳循环和生态的Dom的反应性形式。

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  • 来源
    《Environmental Science & Technology》 |2021年第10期|7135-7144|共10页
  • 作者

    Lei Xue; David J. Kieber;

  • 作者单位

    Department of Chemistry State University of New York College of Environmental Science and Forestry Syracuse New York 13210 United States;

    Department of Chemistry State University of New York College of Environmental Science and Forestry Syracuse New York 13210 United States;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    dimethylsulfide; dimethylsulfoniopropionate; dmsp; dms; actinometry; phytoplankton; acrylic acid;

    机译：二甲基硫化物;二甲基磺基丙酸酯;DMSP;DMS;散步;Phytoplankton;丙烯酸;

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