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首页> 外文期刊>Environmental research >Enantio-selective molecular dynamics of ( ± )-o,p-DDT uptake and degradation in water-sediment system
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Enantio-selective molecular dynamics of ( ± )-o,p-DDT uptake and degradation in water-sediment system

机译：水沉淀系统中（±）-o，p-DDT吸收和降解的对映选择性分子动力学

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摘要

Enantio-selective molecular dynamics of ( ± )-o,p-DDT uptake and degradation in water-sediment system is described. Both uptake and degradation processes of (-)-o,p-DDT were slightly higher than ( + )-o,p-DDT en-antiomer. The optimized parameters for uptake were 7.0 μg L~(-1)concentration of o,p-DDT, 60 min contact time, 5.0 pH, 6.0 g L~(-1) amount of reverine sediment and 25 °C temperature. The maximum degradation of both (-)-and ( + )-o,p-DDT was obtained with 16 days, 0.4 μg L~(-1) concentration of o,p-DDT, pH 7 and 35 °C temperature. Both uptake and degraded process followed first order rate reaction. Thermodynamic parameters indicated exothermic nature of uptake and degradation processes. Both uptake and degradation were slightly higher for (-)-enantiomer in comparison to (+ )-enantiomer of o,p-DDT. It was concluded that both uptake and degradation processes are responsible for the removal of o,p-DDT from nature but uptake plays a crucial role. The percentage degradations of (-)- and (+ )-o,p-DDT were 30.1 and 29.5, respectively. This study may be useful to manage o,p-DDT contamination of our earth's ecosystem.
机译：描述了水沉淀系统中（±）-o，p-DDT吸收和降解的对映选择性分子动力学。 （-）-o，p-DDT的摄取和降解过程均略高于（+）-o，p-DDT对映体。最佳吸收参数为邻，对-DDT浓度为7.0μgL〜（-1），60分钟接触时间，5.0 pH，6.0 g L〜（-1）的ververine沉积物和25°C温度。在pH值为7和35°C的o，p-DDT浓度为0.4μgL〜（-1）16天的条件下，得到了（-）-和（+）-o，p-DDT的最大降解。吸收和降解过程都遵循一级反应。热力学参数表明吸收和降解过程的放热性质。与o，p-DDT的（+）-对映异构体相比，（-）-对映异构体的摄取和降解均略高。结论是摄取和降解过程均是从自然界中去除o，p-DDT的原因，但摄取起着至关重要的作用。 （-）-和（+）-o，p-DDT的降解百分比分别为30.1和29.5。这项研究可能对管理地球生态系统的o，p-DDT污染有用。

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  • 来源
    《Environmental research》 |2018年第1期|353-357|共5页
  • 作者

    Imran Ali; Omar M.L. Alharbi; Zeid A. Alothman; Abdulrahman Alwarthan;

  • 作者单位

    Department of Chemistry, Faculty of Sciences, Taibah University, Al-Medina Al-Munawara 41477, Saudi Arabia,Department of Chemistry, Jamia Millia Islamia, (Central University), New Delhi, India;

    Biology Department, Faculty of Sciences, Taibah University, Al-Medina Al-Munawara 41477, Saudi Arabia;

    Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia;

    Department of Chemistry, College of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia;

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  • 正文语种 eng
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  • 关键词

    o; p-DDT; Enantiomers; Uptake; Degradation; Thermodynamics; Kinetics;

    机译：o;对滴滴涕;对映异构体;吸收;降解;热力学;动力学;

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