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Quantifying Interactions Between Singlet Oxygen And Aquatic Fulvic Acids

机译：定量单线态氧与水合富勒酸之间的相互作用

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摘要

Singlet oxygen (~10_2) is a reactive oxygen species produced by dissolved organic matter (DOM) in sunlit waters. While the production of~ 10_2 by DOM has been studied, little is known on interactions between ~10_2 and DOM. The central objective of this work was to quantify the rate constants of reaction and quenching of~10_2 with Suwannee River and Pony Lake fulvic acids, the terrestrial and microbial end-member reference aquatic humic substances of the International Humic Substance Society. Fulvic acids were reacted with ~10_2 generated through visible light irradiation of Rose Bengal. Uptake of ~1O_2 by the fulvic acids was followed through changes in dissolved oxygen concentrations via membrane inlet mass spectrometry (MIMS). Results from multiple diagnostic tests for~1'O_2-processes in solution suggested that 64-70% of the observed uptake of oxygen by the fulvic acid solutions was due to reaction with ~1'O_2 the remaining 0_2 uptake was likely due to non-~10)2 processes initiated by the excited-state sensitizer. The rate constants of reaction (k_(rxn)) and physical quenching (k_(phys)) with ~10_2 were determined to be 2.6 × 10~5 M-C~~(-1) s~(-1) and 2.7 ×10~5M-C~1s~(-1) (k~(rxm)and 1.5 ×i10~5M-C~1-s~(-1) and 1.3 ×106M-C~1-s~(-1) (k_(phys) for Suwannee River and Pony Lake fulvic acids, respectively. Results from this study demonstrated that~10_2 reacts with microbially and terrestrially derived DOM at rate constants comparable to phenols, naphthols, or aromatic amines, on a per carbon basis.
机译：单线态氧（〜10_2）是由阳光照射水中的溶解性有机物（DOM）产生的活性氧。虽然研究了DOM产生〜10_2的情况，但对〜10_2和DOM之间的相互作用知之甚少。这项工作的主要目标是量化与Suwannee河和Pony Lake黄腐酸（国际腐殖质协会的陆地和微生物末端成员参考水生腐殖质）反应和淬灭〜10_2的速率常数。黄腐酸与玫瑰红的可见光照射产生的〜10_2反应。经由膜入口质谱法（MIMS）通过溶解氧浓度的变化跟踪黄腐酸对〜1O_2的吸收。溶液中〜1'O_2-过程的多个诊断测试结果表明，黄腐酸溶液观察到的氧气吸收的64-70％是由于与〜1'O_2反应，其余0_2的吸收可能是由于由激发态敏化剂引发的〜10）2过程。测得〜10_2的反应速率常数（k_（rxn））和物理淬灭（k_（phys））的常数为2.6×10〜5 MC ~~（-1）s〜（-1）和2.7×10〜 5M-C〜1s〜（-1）（k〜（rxm）和1.5×i10〜5M-C〜1-s〜（-1）和1.3×106M-C〜1-s〜（-1）（k_研究表明，〜10_2与微生物和陆地来源的DOM的反应速率常数与酚，萘或芳香胺相当，基于每个碳。

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  • 来源
    《Environmental Science & Technology》 |2009年第3期|718-723|共6页
  • 作者

    ROSE M. CORY; JAMES B. COTNER; AND KRISTOPHER MCNEILL;

  • 作者单位

    Department of Ecology, Evolution and Behavior, University of Minnesota, 1987 Upper Buford Circle, St. Paul, Minnesota, and Department of Chemistry, University of Minnesota, 207 Pleasant St SE, Minneapolis, Minnesota;

  • 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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