酰胺类除草剂在土壤上吸附的位置能量分布分析
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*国家自然科学基金(批准号:30270767)项目


SITE-ENERGY DISTRIBUTION ANALYSIS FOR ADSORPTION OF SELECTED ACETANILIDE HERBIC IDES IN SOILS
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    摘要:

    根据异丙甲草胺、乙草胺、丙草胺和丁草胺在六种土壤上的等温吸附结果,计算了它们在六种土壤上的位置能量分布和有机质标化的平均分配常数.结果表明:四种除草剂在六种土壤上的吸附等温线为Freundlich型;低浓度范围内,农药在土壤上的吸附首先发生在土壤表面的高能吸附位置上;土壤表面位置能量分布的具体情况与被吸附农药性质有关;土壤上的吸附位置数或吸附容量主要与土壤有机质含量有关,粘土对吸附也有一定的贡献;疏水键合机理在四种酰胺类除草剂吸附过程中起着重要的作用.

    Abstract:

    The site-energy distribution function offers a method to evaluate heterogeneous properties of sorbents. The sorption of selected acetanilide herbicides on six different soils is examined by using batch equilibrium methods,and sorption data were fitted with the Freundlich equation.The site-energy distributions and mean-value of partitioning coefficients normalized to organic matter for each herbicide on six soils was obtained.The results indicated that the herbicide was firstly adsorbed on the high-energy sites of soil surface when adsorbed at the lower concentration.The herbicide properties can influent the site-energy distribution of soils.The number of sites or the sorption capacity on soils was related to the content of organic matter in soils,the clay also contributed to sorption to limited extent.The hydrophobic binding may be relatively important in the process of the four herbicides adsorbed by soils.

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李克斌,刘广深,刘维屏.酰胺类除草剂在土壤上吸附的位置能量分布分析[J].土壤学报,2003,40(4):574-580. DOI:10.11766/trxb200110290414 Li Ke-bin, Liu Guang-shen, Liu Wei-ping. SITE-ENERGY DISTRIBUTION ANALYSIS FOR ADSORPTION OF SELECTED ACETANILIDE HERBIC IDES IN SOILS[J]. Acta Pedologica Sinica,2003,40(4):574-580.

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  • 收稿日期:2001-10-29
  • 最后修改日期:2002-04-26
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  • 在线发布日期: 2013-02-25
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