Physical characteristics and Freundlich model of adsorption and desorption isotherm for fipronil in six types of Egyptian soil

Q2 Chemistry

Current Chemistry Letters Pub Date : 2023-01-01 DOI:10.5267/j.ccl.2022.8.003

Mohamed R. Fouad

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引用次数: 6

Abstract

The soil type and temperature are considered important parameters that can influence the rates and equilibria of different environmental processes. Therefore, the adsorption and desorption isotherms of fipronil in clay loam, clay, sandy loam, sandy clay loam, sand and loamy sand soils at 25 and 50˚C was studied. The amount of fipronil adsorbed and desorbed by different soils was significantly influenced by the temperature. Adsorption was higher in clay loam, clay, sandy clay loam and sandy soil at 25°C, while sand soil and loamy sand soil at 50°C. The non-desorbed amount was greater at 25°C in different types of soil except for clay loam soil. The negative ΔG˚ indicated that the adsorption/desorption in different types of soil was spontaneous at different temperatures. The value of standard enthalpy change (ΔH˚) was positive in clay soil, sandy loam soil, sandy clay loam soil and loamy sand soil for adsorption and sandy loam soil, sand soil and loamy sand soil for desorption. Moreover, the standard entropy change (ΔS˚) was negative in soils for adsorption and desorption isotherms except clay loam soil. Adsorption and desorption isotherms trends as well as the values of the correlation coefficients indicated that the adsorption and desorption isotherms of fipronil in tested soils were fitted to the Freundlich model because the correlation coefficient is very close to 0.999.

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氟虫腈在6种埃及土壤中吸附解吸等温线的物理特性及Freundlich模型

土壤类型和温度被认为是影响不同环境过程速率和平衡的重要参数。因此，研究了氟虫腈在粘土壤土、粘土、砂质壤土、砂质粘土壤土、砂土和壤土中25和50℃的吸附和解吸等温线。不同土壤对氟虫腈的吸附和解吸量受温度的影响显著。在25℃时，粘壤土、粘土、砂质粘土壤土和砂质土的吸附性最高，而在50℃时，砂土和壤土的吸附性最高。除粘壤土外，不同类型土壤在25℃时未解吸量均较大。负ΔG˚表明不同类型土壤在不同温度下的吸附/解吸是自发的。标准焓变(ΔH˚)在黏性土、砂质壤土、砂质壤土和壤土中均为正，在黏性壤土、砂质壤土和壤土中均为正。除粘壤土外，吸附和解吸等温线的标准熵变(ΔS˚)均为负。吸附和解吸等温线趋势及相关系数值表明，氟虫腈在试验土壤中的吸附和解吸等温线符合Freundlich模型，相关系数非常接近0.999。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Current Chemistry Letters Chemistry-Chemistry (all)

CiteScore

4.90

自引率

0.00%

发文量

审稿时长

20 weeks

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