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首页> 外文期刊>Environmental Science & Technology >Compound-Specific Isotope Analysis and Enantiomer Fractionation to Characterize the Transformation of Hexachlorocyclohexane Isomers in a Soil-Wheat Pot System
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Compound-Specific Isotope Analysis and Enantiomer Fractionation to Characterize the Transformation of Hexachlorocyclohexane Isomers in a Soil-Wheat Pot System

机译：特异性同位素分析和对映异构体分馏，以表征六氯环己烷异构体在土麦盆栽系统中的转化

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摘要

The uptake by plants from soil is one of the first steps for hexachlorocyclohexane (HCH) isomers to enter the food web. However, the HCH transformation associated with the uptake process is still not well understood. Therefore, a soil-wheat pot experiment was conducted to characterize the HCH transformation during wheat growth using compound-specific isotope analysis (CSIA) and enantiomer fractionation. The results showed that the δ~(13)C and δ~(37)Cl values of β-HCH remained stable in soil and wheat, revealing no transformation. In contrast, an increase of δ~(13)C and δ~(37)Cl values of α-HCH indicated its transformation in soil and wheat. A shift of the enantiomer fraction (EF) (-) from 0.50 to 0.35 in soil at the jointing stage and 0.35 to 0.57 at the harvest stage suggested that the preferential transformation of enantiomers varied at different growth stages. Based on the dual element isotope analysis, the transformation mechanism in the soil-wheat system was different from that in wheat in hydroponic systems. The high abundance of HCH degraders, Sphingomonas sp. and Novosphingobium sp., was detected in the α-HCH-treated rhizosphere soil, supporting the potential for biotransformation. The application of CSIA and EF allows characterizing the transformation of organic pollutants such as HCHs in the complex soil-plant systems.
机译：来自土壤的植物的吸收是进入食物网的六氯环己烷（HCH）异构体的第一步之一。然而，与摄取过程相关的HCH变换仍然不太了解。因此，进行了土壤 - 小麦盆栽实验以表征使用复合特异性同位素分析（CSIA）和对映体分馏进行小麦生长期间的HCH转化。结果表明，β-HCH的δ〜（13）C和δ〜（37）Cl值保持稳定，露出无转化。相反，α〜（13）C和δ〜（37）Cl值的增加表明其在土壤和小麦中的转化。在接合阶段的映体馏分（EF）（ - ）在土壤中从0.50-0.35的偏移，在收获阶段的0.35至0.57中表明对映体的优先转化在不同的生长阶段变化。基于双元素同位素分析，土壤 - 小麦系统中的转化机制与水培系统中小麦的转化机制不同。高度丰富的HCH降解剂，鞘磷脂SP。在α-HCH处理的根际土壤中检测到Novosphing obium sp，支持生物转化的可能性。 CSIA和EF的应用允许表征复杂土壤 - 植物系统中的有机污染物如HCH的转化。

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  • 来源
    《Environmental Science & Technology》 |2020年第14期|8690-8698|共9页
  • 作者

    Xiao Liu; Langping Wu; Steffen Kuemmel; Ines Merbach; Rup Lal; Hans H. Richnow;

  • 作者单位

    Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZ 04318 Leipzig Germany;

    Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZ 04318 Leipzig Germany Department of Civil &. Mineral Engineering University of Toronto Toronto ON M5S 1A4 Canada;

    Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZ 04318 Leipzig Germany;

    Department of Community Ecology Helmholtz Centre for Environmental Research GmbH-UFZ 06102 Halle Germany;

    Molecular Biology Laboratory Department of Zoology University of Delhi Delhi 110007 India;

    Department of Isotope Biogeochemistry Helmholtz Centre for Environmental Research-UFZ 04318 Leipzig Germany;

  • 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);
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