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首页> 外文期刊>Environmental Science & Technology >Methanethiol in Nonacclimated Sewage Sludge after Addition of Chloroform and Other Toxicants
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Methanethiol in Nonacclimated Sewage Sludge after Addition of Chloroform and Other Toxicants

机译：加入氯仿和其他有毒物质后，非适应性污水污泥中的甲硫醇

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摘要

An unacclimated culture from a municipal anaerobic digester transformed chloroform at initial concentrations from 320 to 3500 μg/L. Dichloromethane and chloromethane were intermediates, and carbon dioxide was a product. Initial chloroform concentration influenced the transformation rate constant. With 320 μg/L chloroform, gas production was 110 ± 4% of theoretical, and the specific first-order rate constant for chloroform was 4.55 L g~(-1) day~(-1). With 800 μg/L chloroform, gas production was reduced to 56 ± 12% of theoretical, and the first-order rate constant was 1.21 L g~(-1) day~(-1). Methanethiol was detected when toxic doses of chloroform were administered; however, no methanethiol was evident at chloroform concentrations of 320 μg/L. Also, the addition of 100 mg/L sodium azide and 47 mg/L trichlo-roethylene resulted in quantifiable methanethiol concentrations. Radiolabeled chloroform (~(14)CHCl_3) was employed, and the methanethiol detected was not radiolabeled. Therefore, methanethiol was not a product of chloroform, dichloromethane, or chloromethane transformation but was detected in response to a toxic event. These results are in contrast to other reports that methanethiol may be a direct product or intermediate of chloromethane and methyl bromide reductive dehalogenation.
机译：来自市政厌氧消化池的未经驯化的培养物将初始浓度为320至3500μg/ L的氯仿转化为氯仿。二氯甲烷和氯甲烷为中间体，二氧化碳为产物。初始氯仿浓度影响转化率常数。在320μg/ L氯仿下，产气量为理论值的110±4％，氯仿的特定一级速率常数为4.55 L g〜（-1）天〜（-1）。在800μg/ L的氯仿下，产气量减少到理论值的56±12％，一级速率常数为1.21 L g〜（-1）天〜（-1）。当使用有毒剂量的氯仿时，会检测到甲硫醇。然而，在320μg/ L的氯仿浓度下，没有发现甲硫醇。同样，添加100 mg / L叠氮化钠和47 mg / L三氯乙烯导致可量化的甲硫醇浓度。使用放射性标记的氯仿（〜（14）CHCl_3），检测到的甲硫醇未进行放射性标记。因此，甲硫醇不是氯仿，二氯甲烷或氯甲烷转化的产物，而是在对有毒事件的响应中被检测到的。这些结果与甲烷硫醇可能是氯甲烷和甲基溴还原脱卤作用的直接产物或中间体的其他报道形成对比。

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  • 来源
    《Environmental Science & Technology》 |1995年第3期|p.762-768|共7页
  • 作者

    DANIEL H. ZITOMER; RICHARD E. SPEECE;

  • 作者单位

    Barge, Waggoner, Sumner, and Cannon, Inc., 162 3rd Ave. N., Nashville, TN 37201;

  • 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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