ABSTRACT

The present research aims to investigate the adsorption of a commonly used, quinalphos organophosphate pesticide on to four different agricultural soils of Punjab, India. The results revealed that the highest adsorption of quinalphos was observed on soil D (Loamy Sand). The data obtained after analyzing adsorption isotherms were subjected to classical Linear and Non-Linear (Langmuir, Freundlich, and Temkin) Isotherms. Linear isotherms were classified as S and L-type according to Giles classification. The experimental data is best suited to the logarithmic form of the Freundlich and Temkin models. In kinetics studies, the regression results showed the best fitting to the pseudo-second-order kinetic model. The desorption studies of quinalphos were carried out using tap and distilled water as eluents and revealed that the leaching potential of the pesticide was higher in soil C (low organic matter content).

摘要

本研究旨在调查一种常用的喹那磷有机磷农药在印度旁遮普省四种不同农业土壤上的吸附情况。结果表明，喹诺磷在土壤 D（壤土）上的吸附量最高。分析吸附等温线后获得的数据经过经典的线性和非线性（Langmuir、Freundlich 和 Temkin）等温线。根据吉尔斯分类，线性等温线分为 S 型和 L 型。实验数据最适合 Freundlich 和 Temkin 模型的对数形式。在动力学研究中，回归结果显示出与伪二级动力学模型的最佳拟合。