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首页> 外文期刊>Environmental Science & Technology >Sunlight-Mediated Inactivation of MS2 Coliphage via Exogenous Singlet Oxygen Produced by Sensitizers in Natural Waters
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Sunlight-Mediated Inactivation of MS2 Coliphage via Exogenous Singlet Oxygen Produced by Sensitizers in Natural Waters

机译：天然水中敏化剂产生的外源单重态氧通过阳光介导的MS2灭活

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摘要

Pathogens in sunlit surface waters can be damaged directly by UVB light. Indirect inactivation by reactive oxygen species (ROS) generated by sunlight interacting with external sensitizer molecules may also be important, but this mechanism has not been conclusively demonstrated. To better understand the role of ROS, we investigated the inactivation of MS2 coliphage, a commonly used surrogate for human enteric viruses, in water samples irradiated with a solar simulator and containing different types of sensitizers: waste stabilization pond (WSP) constituents, Fluka humic acid (FHA), and Suwannee River humic acid (SRHA). Inactivation of MS2 by the indirect mechanism was significant for all three sensitizers, and the efficiency of the sensitizers at inactivating MS2 was FHA > SRHA > WSP. Both dissolved and particulate fractions in the WSP water contributed to inactivation. In the WSP water, the indirect process was quantitatively more important than direct damage by UVB light, due to the rapid attenuation of UVB compared to the longer wavelengths that may initiate the indirect mechanism. Singlet oxygen (~1O_2) was the most important ROS involved in the inactivation of MS2. The addition of histidine, a ~1O_2 quencher, decreased inactivation, whereas inactivation rate constants increased in solutions of D_2O. Selective quenchers for other ROS showed little or no protective effect. Inactivation in WSP water was a function of the steady-state ~1O_2 concentration and could be described by a second-order rate expression.
机译：阳光照射的地表水中的病原体可被UVB光直接破坏。由阳光与外部敏化剂分子相互作用产生的活性氧（ROS）引起的间接失活也可能很重要，但尚未最终证实这种机理。为了更好地了解ROS的作用，我们研究了用太阳模拟器辐照并包含不同类型的敏化剂的水样中人类肠道病毒的常用替代物MS2噬菌体的失活：废物稳定池（WSP）成分，Fluka腐殖质酸（FHA）和苏万尼河腐殖酸（SRHA）。通过间接机制对MS2的灭活对所有三种敏化剂均很重要，并且敏化剂对MS2的灭活效率为FHA> SRHA> WSP。 WSP水中的溶解部分和颗粒部分均导致失活。在WSP水中，由于与可能引发间接机理的较长波长相比，UVB的快速衰减，间接过程在数量上要比UVB光的直接损害更为重要。单线态氧（〜1O_2）是参与MS2灭活的最重要的ROS。组氨酸（〜1O_2猝灭剂）的添加减少了失活，而在D_2O溶液中失活速率常数增加。其他ROS的选择性淬灭剂几乎没有保护作用。 WSP水中的失活是稳态〜1O_2浓度的函数，可以用二阶速率表达来描述。

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  • 来源
    《Environmental Science & Technology》 |2007年第1期|p.192-197|共6页
  • 作者

    TAMAR KOHN; KARA L. NELSON;

  • 作者单位

    Department of Civil and Environmental Engineering, Univeristy of California, Berkeley, Berkeley, California 94720;

  • 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 环境化学;
  • 关键词

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