...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Determining the Temperature Dependency of Biodegradation Kinetics for 34 Hydrocarbons while Avoiding Chemical and Microbial Confounding Factors
【24h】

Determining the Temperature Dependency of Biodegradation Kinetics for 34 Hydrocarbons while Avoiding Chemical and Microbial Confounding Factors

机译：确定34种烃的生物降解动力学的温度依赖性，同时避免化学和微生物混杂因子

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Biodegradation kinetics data are keystone for evaluating the environmental persistence and risk of chemicals. Biodegradation kinetics depend highly on the prevailing temperature, which influences microbial community structures, metabolic rates, and chemical availability. There is a lack of high-quality comparative biodegradation kinetics data that are determined at different test temperatures but with the same microbial inoculum and chemical availability. The present study was designed to determine the effect of test temperature on the biodegradation kinetics of hydrocarbons while avoiding confounding factors. We used inocula from a Northern river (2.7 °C) and a Central European river (12.5 °C). Aqueous stock solutions containing 45 individual hydrocarbons were generated by passive dosing and added to river water containing the native microorganisms. Compound-specific biodegradation kinetics were then determined at 2.7, 12, and 20 °C based on substrate depletion. Main findings comprise the following: (1) Degradation half-times (DegT_(50)) of 34 test chemicals were determined at different test temperatures and were largely consistent with the Arrhenius equation (activation energy, 65.4 kJ/mol). (2) Differences in biodegradation kinetics between tested isomers were rather limited. (3) The recent lowering of standard test temperature from 20 to 12 °C results typically in a doubling of DegT_(50) values and can lead to a stricter persistency assessment.
机译：生物降解动力学数据是用于评估环境持久性和化学品风险的梯度。生物降解动力学依赖于普遍的温度，影响微生物群落结构，代谢率和化学物质。缺乏在不同的测试温度下确定的高质量比较生物降解动力学数据，但具有相同的微生物接种和化学物质。本研究旨在确定测试温度对烃生物降解动力学的影响，同时避免混淆因素。我们使用北部河流（2.7°C）和中欧河流（12.5°C）的汤。含有45个单独的烃的含水储备溶液由被动剂量产生并加入含有天然微生物的河水中。然后基于底物耗尽在2.7,12和20℃下测定化合物特异性生物降解动力学。主要发现包括以下内容：（1）在不同的测试温度下测定34个测试化学品的半次（DEGT_（50）），并且与Arrhenius方程（激活能量，65.4kJ / mol）大致一致。 （2）测试异构体之间的生物降解动力学的差异相当有限。 （3）最近将标准测试温度从20至12°C的降低结果降低，其结果通常在DEGT_（50）的倍增中，并且可以导致更严格的持久性评估。

著录项

  • 来源
    《Environmental Science & Technology》 |2021年第16期|11091-11101|共11页
  • 作者

    Karina Knudsmark Sjoholm; Heidi Birch; Rikke Hammershoj; David M. V. Saunders; Arnaud Dechesne; Andreas P. Loibner; Philipp Mayer;

  • 作者单位

    Department of Environmental Engineering Technical University of Denmark DK-2800 Kongens Lyngby Denmark;

    Department of Environmental Engineering Technical University of Denmark DK-2800 Kongens lyngby Denmark;

    Department of Environmental Engineering Technical University of Denmark DK-2800 Kongens Lyngby Denmark;

    Shell Health Shell International B.V. 2596 HR The Hague The Netherlands;

    Department of Environmental Engineering Technical University of Denmark DK-2800 Kongens Lyngby Denmark;

    Institute of Environmental Biotechnology BOKU - University of Natural Resources and Life Sciences A-3430 Tulln Austria;

    Department of Environmental Engineering Technical University of Denmark DK-2800 Kongens Lyngby Denmark;

  • 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

    Arrhenius equation; Danube; isomer-specific degradation; OECD 309; simulation biodegradation test;

    机译：arrhenius方程;多瑙河;特定于异构体的降解;经合组织309;仿真生物降解测试;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号