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首页> 外文期刊>Environmental Science & Technology >Mixture Effects on Biodegradation Kinetics of Hydrocarbons in Surface Water: Increasing Concentrations Inhibited Degradation whereas Multiple Substrates Did Not
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Mixture Effects on Biodegradation Kinetics of Hydrocarbons in Surface Water: Increasing Concentrations Inhibited Degradation whereas Multiple Substrates Did Not

机译：混合气体对地表水中碳氢化合物生物降解动力学的影响：浓度增加抑制降解，而多种基质则没有

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摘要

Most biodegradation tests are conducted using single chemicals at high concentrations, although these chemicals are present in the environment as mixtures at low concentrations. A partitioning-based platform was recently developed for biodegradation testing of composed mixtures of hydrophobic chemicals at ng/L to mu g/L concentrations. We used this platform to study the concentration and mixture effect on biodegradation kinetics. Biodegradation tests were conducted in 20 mL vials using environmental water samples as inocula. Passive dosing was applied (1) to vary initial test concentrations of individual test compounds and (2) to vary the number of mixture components between 1 and 16. Automated solid-phase microextraction coupled to gas chromatography-mass spectrometry was used to measure substrate depletion relative to abiotic controls. The number of mixture components had no or only a limited effect on the biodegradation half times for three compounds when tested at environmentally relevant concentrations. In contrast, longer lag phases and half lives were observed for single compounds when tested at higher concentrations that approached aqueous solubility. The obtained results support that simultaneous testing of multiple chemicals at low concentrations can accelerate the generation of biodegradation kinetic data, which are more environmentally relevant compared with data from tests conducted with single chemicals at much higher concentrations.
机译：大多数生物降解测试都是使用高浓度的单一化学物质进行的，尽管这些化学物质以低浓度的混合物形式存在于环境中。最近开发了一个基于分区的平台，用于对浓度从ng / L到μg / L的疏水化学物质的混合物进行生物降解测试。我们使用该平台研究了浓度和混合物对生物降解动力学的影响。使用环境水样品作为接种物，在20 mL小瓶中进行了生物降解测试。采用被动加料（1）来改变各个测试化合物的初始测试浓度，以及（2）在1到16之间改变混合物成分的数量。使用自动固相微萃取与气相色谱-质谱联用来测量底物耗竭。相对于非生物对照。在与环境相关的浓度下进行测试时，三种化合物的混合物组分的数量对生物降解的半衰期没有影响，或仅有有限的影响。相反，当在接近水溶性的较高浓度下测试时，单个化合物观察到更长的滞后阶段和半衰期。获得的结果表明，同时测试多种低浓度的化学药品可以加速生物降解动力学数据的生成，与使用单一浓度高得多的化学药品进行测试的数据相比，该数据对环境的影响更大。

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  • 来源
    《Environmental Science & Technology》 |2019年第6期|3087-3094|共8页
  • 作者

    Hammershoj Rikke; Birch Heidi; Redman Aaron D.; Mayer Philipp;

  • 作者单位

    Tech Univ Denmark, Dept Environm Engn, Bldg 115, DK-2800 Lyngby, Denmark;

    Tech Univ Denmark, Dept Environm Engn, Bldg 115, DK-2800 Lyngby, Denmark;

    ExxonMobil Biomed Sci Inc, Annandale, NJ 08801 USA;

    Tech Univ Denmark, Dept Environm Engn, Bldg 115, DK-2800 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
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