首页> 外文期刊>Environmental Science & Technology >Reductive Dechlorination of α-, ss-,γ-, and δ-Hexachlorocyclohexane Isomers with Hydroxocobalamin, in Soil Slurry Systems
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Reductive Dechlorination of α-, ss-,γ-, and δ-Hexachlorocyclohexane Isomers with Hydroxocobalamin, in Soil Slurry Systems

机译:在土壤浆液系统中用羟考巴兰素对α-,ss-,γ-和δ-六氯环己烷异构体进行还原脱氯

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摘要

The present study was carried out to test the viability of a method of reductive dehalogenation of α-, β-, γ-, and δ-hexachlorocyclohexane (HCH) in soil slurry systems. The soil slurries were maintained under anaerobic conditions, with titanium(III) citrate as a reducing agent and hydroxocobalamin (vitamin B_(12a)) as a catalyzing agent Experiments were carried out with two soil samples with markedly different characteristics (particularly regarding organic matter content), at a small scale and larger reactor scale. HCH concentration was monitored throughout the 24 h duration of the tests. In the low organic matter soil HCH isomers degraded rapidly, in both the small scale and reactor systems, and undetectable levels (<0.5%) were reached within 5 h. However, complete degradation of HCH isomers was not achieved in soil with high organic matter content and there were differences between the results obtained in the small scale and reactor systems. In the small scale system,the levels of degradation reached 93,88,94, and 91%, for α-, β-, γ-, and δ-HCH, respectively, and the nondegraded HCH was sorbed in the soil. In the reactor system, the reaction stopped after two hours (no more than 65% of any of the isomers was degraded).
机译:本研究旨在测试土壤泥浆系统中α-,β-,γ-和δ-六氯环己烷(HCH)还原脱卤方法的可行性。将土壤浆液保持在厌氧条件下,以柠檬酸钛(III)作为还原剂,并使用羟考巴兰素(维生素B_(12a))作为催化剂。对两个具有明显不同特征的土壤样品进行了实验(特别是关于有机物含量) ),小规模和更大的反应堆规模。在整个测试过程的24小时内都监测HCH浓度。在低有机质土壤中,六氯环己烷异构体在小规模和反应器系统中均迅速降解,在5小时内达到不可检测的水平(<0.5%)。但是,在有机物含量高的土壤中,六氯环己烷异构体无法完全降解,在小规模和反应器系统中获得的结果之间存在差异。在小规模系统中,α-,β-,γ-和δ-HCH的降解水平分别达到93、88、94和91%,未降解的HCH吸附在土壤中。在反应器系统中,两个小时后反应停止(不超过65%的任何异构体被降解)。

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  • 来源
    《Environmental Science & Technology》 |2010年第18期|p.7063-7069|共7页
  • 作者单位

    Institute de Investigations Agrobiologicas de Galicia, CSIC.Apdo. 122. Santiago de Compostela, E-15780, Spain;

    rnDepartment of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela,Spain;

    rnDepartment of Chemical Engineering, Institute of Technology, University of Santiago de Compostela, E-15782 Santiago de Compostela,Spain;

    rnDepartamento de Edafoloxla e Qulmica Agrlcola,Facultade de Bioloxta, Universidade de Santiago de Compostela,E-15782 Santiago de Compostela, Spain;

    rnDepartamento de Edafoloxla e Qulmica Agrlcola,Facultade de Bioloxta, Universidade de Santiago de Compostela,E-15782 Santiago de Compostela, Spain;

  • 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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  • 入库时间 2022-08-17 14:04:04

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