Organic carbon nature determines the capacity of organic amendments to adsorb pesticides in soil.,Journal of Hazardous Materials

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Organic carbon nature determines the capacity of organic amendments to adsorb pesticides in soil.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-01-21 , DOI: 10.1016/j.jhazmat.2020.122162
Carlos García-Delgado ₁ , Jesús M Marín-Benito ₂ , María J Sánchez-Martín ₂ , M Sonia Rodríguez-Cruz ₂

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The spread of organic pollutants from soil to other environments is one important source of environmental pollution. The addition of organic amendments to soil is an interesting strategy to control pollutants leaching. However, the contribution of different carbon types of organic amendments to organic pollutants adsorption is not clear. Hence, the objective of this work was to determine the role of carbon types of organic amendments into the adsorption of four herbicides. To this extent, organic amendments were characterized by elemental analysis and 13C-NMR and adsorption-desorption isotherms of herbicides by the organic amendments and two soils amended with them were obtained. Adsorption coefficients were correlated with the organic carbon content of the organic amendments and the adsorption process was enhanced by the hydrophobicity of herbicides and the aliphatic and aromatic carbon of amendments. Organic amendments increased the adsorption of herbicides by soils but it is not possible to extrapolate results from one soil to another because organo-mineral interactions between soils and organic amendments can modify this process. Desorption isotherms of herbicides from organic amendments and/or amended soils presented hysteresis indicating the irreversible adsorption of herbicides. Desorption results indicated, the abundance of O-alkyl and N-alkyl groups in organic amendments enhanced the hysteresis in amended soils.

中文翻译：

有机碳的性质决定了有机改良剂吸附土壤中农药的能力。

有机污染物从土壤到其他环境的扩散是环境污染的重要来源之一。向土壤中添加有机改良剂是控制污染物浸出的有趣策略。但是，不同碳类型的有机修饰剂对有机污染物吸附的贡献尚不清楚。因此，这项工作的目的是确定有机修饰剂的碳类型在四种除草剂吸附中的作用。在此程度上，通过元素分析和13 C-NMR对有机修饰剂进行了表征，并通过有机修饰剂对除草剂进行了吸附-解吸等温线，并获得了用它们改性的两种土壤。吸附系数与有机改性剂的有机碳含量相关，除草剂的疏水性以及改性剂的脂族和芳族碳提高了吸附过程。有机改良剂增加了土壤对除草剂的吸附，但是不可能将结果从一种土壤推算到另一种土壤，因为土壤与有机改良剂之间的有机矿物相互作用可以改变这一过程。有机改性剂和/或改良土壤中除草剂的解吸等温线显示出滞后现象，表明除草剂的吸附不可逆。解吸结果表明，有机改性剂中大量的O-烷基和N-烷基增强了改良土壤的滞后性。有机改性剂增加了土壤对除草剂的吸附，但是不可能将结果从一种土壤推算到另一种土壤，因为土壤与有机改性剂之间的有机矿物质相互作用可以改变这一过程。有机改性剂和/或改良土壤中除草剂的解吸等温线显示出滞后现象，表明除草剂的吸附不可逆。解吸结果表明，有机改性剂中大量的O-烷基和N-烷基增强了改良土壤的滞后性。有机改性剂增加了土壤对除草剂的吸附，但是不可能将结果从一种土壤推算到另一种土壤，因为土壤与有机改性剂之间的有机矿物质相互作用可以改变这一过程。有机改性剂和/或改良土壤中除草剂的解吸等温线显示出滞后现象，表明除草剂的吸附不可逆。解吸结果表明，有机改性剂中大量的O-烷基和N-烷基增强了改良土壤的滞后性。有机改性剂和/或改良土壤中除草剂的解吸等温线显示出滞后现象，表明除草剂的吸附不可逆。解吸结果表明，有机改性剂中大量的O-烷基和N-烷基增强了改良土壤的滞后性。有机改性剂和/或改良土壤中除草剂的解吸等温线显示出滞后现象，表明除草剂的吸附不可逆。解吸结果表明，有机改性剂中大量的O-烷基和N-烷基增强了改良土壤的滞后性。

更新日期：2020-01-22

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