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Enhanced irreversible sorption of carbaryl to soils amended with crop-residue-derived biochar

机译：农药残留衍生的生物炭改良了西维因对土壤的不可逆吸附性

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摘要

The irreversible sorption-desorption of carbaryl in five soil types with crop-residue-derived biochar (CBC) amendment was determined. CBC has lower surface area and micropores volume than wood-based biochar and charcoal. However, CBC amendment (0.5%) still significantly enhanced the hysteresis effect on soils, with a 1.7- to 2.8-fold increase in the hysteresis index (HI) values. The HI values increased exponentially with the increased amount of CBC but decreased exponentially with the increased amount of soil organic matter (SOM%). Furthermore, the irreversible carbaryl sorption (q_(irr)) and the irreversibility index (I_(irr)) values were proportional to the amount of CBC (0-1.0%) in soils. Likewise, the SOM-rich soil (S3) was washed ten times to reduce its S0M% to evaluate the influence of the dissolved organic matter (DOM) in the soils on the irreversible sorption. The I_(irr) values of the unamended S3 increased as the number of sorption-desorption cycles increased, whereas those of the 1.0% CBC-amended S3 decreased. In addition, the I_(irr) values of the unwashed S3 were lower than those of the washed S3. By contrast, the I_(irr) values of the 1.0% CBC-amended S3 soil were higher in the unwashed samples than in the washed samples. These results suggested that DOM had opposite effects on the irreversible carbaryl sorption by unamended and CBC-amended soils. The DOM release may expose more irreversible adsorption sites in the soils and may cover the surface of the CBC to form a desorption-resistant fraction in its mesopore or mac-ropore regions, thereby preventing the desorption of adsorbed carbaryl molecules.
机译：测定了五种土壤类型中具有农作物残留生物炭（CBC）改良剂的西维因的不可逆吸附-解吸。与木质生物炭和木炭相比，CBC具有较低的表面积和微孔体积。但是，CBC修正值（0.5％）仍显着增强了对土壤的磁滞效应，磁滞指数（HI）值提高了1.7到2.8倍。 HI值随CBC的增加呈指数增加，但随土壤有机质（SOM％）的增加呈指数下降。此外，不可逆的甲萘威吸附度（q_（irr））和不可逆指数（I_（irr））值与土壤中CBC的含量成正比（0-1.0％）。同样，将富含SOM的土壤（S3）洗涤十次以降低其SOM％，以评估土壤中溶解的有机物（DOM）对不可逆吸附的影响。随着吸附-解吸循环次数的增加，未修饰的S3的I_（irr）值增加，而经CBC修饰的1.0％的S3的I_（irr）值减少。另外，未洗涤的S3的I_（irr）值低于洗涤的S3的I_（irr）值。相反，未经洗涤的样品中经CBC改性的1.0％CBC的I_（irr）值高于经过洗涤的样品。这些结果表明，DOM对未经改良和经CBC改良的土壤不可逆的西芳基吸附有相反的影响。 DOM释放可能会暴露土壤中更多不可逆的吸附位点，并可能覆盖CBC的表面，从而在其中孔或大孔区域形成抗解吸组分，从而防止被吸附的甲萘威分子解吸。

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  • 来源
    《Chemosphere》 |2013年第1期|69-74|共6页
  • 作者

    Yuping Qiu; Minwei Wu; Jing Jiang; Liang Li; G. Daniel Sheng;

  • 作者单位

    State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;

    College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;

    College of Biological and Environmental Engineering, Zhejiang University of Technology, Hangzhou 310032, PR China;

    State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biochar; Irreversible adsorption; Desorption; Hysteresis;

    机译：生物炭不可逆吸附解吸磁滞现象;

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