Competitive and non-competitive adsorption of atrazine and diuron on alluvial soil

Fouad, Mohamed R.; El-Aswad, Ahmed F.

doi:10.21608/asejaiqjsae.2018.16895

Cited by 3 publications

(3 citation statements)

References 20 publications

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“…Different pesticides adsorb differently in the same type of soil due to different physical and chemical properties. 14 The adsorption-desorption processes of Fipronil have been performed by using batch equilibrium experiments on eight agricultural soils samples from different locations in south of Iraq. The kinetics study for adsorption-desorption processes proved that first order rate law is ogled.…”

Section: Discussionmentioning

confidence: 99%

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

Fouad¹

2023

10.5267/j.ccl

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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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Section: Discussionmentioning

confidence: 99%

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

Fouad¹

2023

10.5267/j.ccl

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“…13 The adsorption of the s-triazines by soils is affected by clay and OM content. 14,15,16 MBZ sorption and mobility were significantly correlated with each other and both parameters were significantly associated with clay content, OM, and water content. 17,18,19,20 Several investigators have reported increased MBZ adsorption with increased OM.…”

Section: Introductionmentioning

confidence: 88%

Effect of particles size on adsorption isotherm of chlorantraniliprole, dinotefuran, bispyribac-sodium, and metribuzin into sandy loam soil

Fouad,

Aly,

El-Aswad

et al. 2024

10.5267/j.ccl

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The efficiency of different sorbents (bulk soil, sand, silt, clay and humic acid-HA) for chlorantraniliprole (CAP), dinotefuran (DNF), bispyribac-sodium (BPS), and metribuzin (MBZ) adsorption was described and compared. The adsorption of CAP, DNF, BPS and MBZ were significantly greater on clay and HA fractions than the bulk soils. Also, the tested pesticides sorption was greater on HA fraction compared to clay fraction except in the case of BPS. The mass unit of bulk soil adsorbed of CAP, DNF, BPS and MBZ approximately 15, 20, 10 and 5 % of the same of HA and 40, 60, 95 and 35 % of that of clay fraction, respectively. The actual amounts adsorbed on bulk soil ranged from (88.63 to 93.93 %) of the calculated amounts adsorbed on all soil components indicating high efficiency of the tested soils to adsorb tested pesticides. All adsorption data fitted well to the linear Freundlich equation. The adsorption of tested pesticides in soil and their different constituents is S-type according to 1/n (except some cases).

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“…Soil samples were collected from different places of the surface layer. The physical and chemical properties of the soil were estimated and presented in Table 1 (Badawy et al 2017;Fouad and El-Aswad 2018;El-Aswad et al 2019;Aly et al 2021;Fouad et al 2021;Fouad 2022.…”

Section: Soilsmentioning

confidence: 99%

Assessment of the acute toxicity of agrochemicals on earthworm (Aporrectodea caliginosa) using filter paper contact and soil mixing tests

2023

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Abstract. El-Aswad AF, Fouad MR, Aly MI. 2023. Assessment of the acute toxicity of agrochemicals on earthworm (Aporrectodea caliginosa) using filter paper contact and soil mixing tests. Asian J Agric 7: 14-19. Earthworms are suitable bioindicators of chemical contamination in terrestrial ecosystems. Therefore, adult earthworms (Aporrectodea caliginosa Savigny, 1826), which are common in Egyptian rice fields were used to study the side effects of fenitrothion and thiobencarb. Also, it was used two common Egyptian soil types; alluvial soil (clay soil) and the calcareous soil (sandy clay loam soil). Two tests were used; filter paper contact test at 24, 48 and 72 h, and the soil mixing test at 5 and 10 days. The effect of both pesticides on mortality of earthworm was insignificant at 24 h with a low mortality percentage. LC50 value of fenitrothion and thiobencarb were 83.16, 288.26, 24.67, and 39.98 µg a.i mL-1 at 48 and 72 h, respectively. Based on the LC50 values, fenitrothion was 3.5 and 1.6 times more toxic than thiobencarb at 48 and 72 h, respectively. At 5 and 10 days after treatment, respectively, the LC50 for fenitrothion in the soil mixing test decreased from 334.27 to 55.45 in clay soil and from (415.90) to (25.00) in sandy soil. Regarding to fenitrothion in soil mixing test, the LC50 was reduced from 334.27 to 55.45 in clay soil and from 415.90 to 25.00 in sandy soil at 5 and 10 days after treatment, respectively. Also, the LC50 of thiobencarb in clay soil was decreased from 0.93 to 0.41 and from 55.28 to 10.65 at 5 and 10 days, respectively. In general, a positive relation was recorded between the tested pesticide toxicity on earthworm and concentrations, and also exposure time. Fenitrothion was more toxic on earthworm in contact filter paper test than thiobencarb. While, in clay soil, fenitrothion was least toxic to the earthworm in soil mixing test, this could be attributed to the slow degradation in the worms and subsequently less elimination of the metabolites as well as attributed to its higher adsorption and lower desorption in soil.

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Competitive and non-competitive adsorption of atrazine and diuron on alluvial soil

Cited by 3 publications

References 20 publications

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

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

Effect of particles size on adsorption isotherm of chlorantraniliprole, dinotefuran, bispyribac-sodium, and metribuzin into sandy loam soil

Assessment of the acute toxicity of agrochemicals on earthworm (Aporrectodea caliginosa) using filter paper contact and soil mixing tests

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