EFFECTS OF CLAY CONTENT IN SOIL ON PESTICIDES SORPTION PROCESS

Journal of The Chilean Chemical Society

article

Sylvia V. Copaja¹  Pablo Gatica-Jeria¹ 

[1] Departamento de Química, Facultad de Ciencias, Universidad de Chile

关键词: Soils;    Diazinon;    Chlorpyrifos;    clay;    sorption constant (Kd);    Langmuir and Freundlich models;   

DOI  :  10.4067/S0717-97072021000105086

学科分类：化学（综合）

来源: Sociedad Chilena de Quimica

【 摘 要 】

Intensive application of pesticides in the agricultural sector and for domestic purposes has resulted in increased usage over the years. Pesticides are used to control pest, diseases and weeds in agricultural and urban areas, but their persistence in the environment has resulted in human poisoning, health risk problem and environmental pollution due to their ability to permeate the soil surface, groundwater systems and water surface bodies. S1. For soil without OM (S2) the order is the same, although the adsorption was lower. The adsorption isotherms were expressed by the Langmuir and Freundlich models. The negative Gibb's free energy change (ΔG°) values obtained suggest that the adsorption of both pesticides, is an exothermic process.Clay addition to the soil, increased the adsorption processes, generating an increase in the amount of pesticide retained in the soil and partially avoiding possible contamination of the aquifers. The difference found in relation to the behavior of both clays on the soil, can be explained considering its structure and its octanol-water partition coefficient (kow).

【 授权许可】

Unknown