Kinetics and thermodynamics of adsorption of cadusafos on soils

ElShafei, Gamal S.; Nasr, I. N.; Hassan, A.; Mohammad, Somaia G.

doi:10.1016/j.jhazmat.2009.08.034

Cited by 55 publications

(27 citation statements)

References 44 publications

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“…The exponent n is an adsorption constant that characterizes the adsorption intensity and energy distribution of the adsorption sites (ElShafei et al, 2009). The Temkin isotherm model is based on the assumption that the adsorption energy decreases linearly with the surface coverage due to adsorbent-adsorbate interactions.…”

Section: Resultsmentioning

confidence: 99%

“…The Temkin isotherm describes the behaviour of adsorption systems on heterogeneous surfaces. The linear form of the Temkin isotherm (ElShafei et al, 2009) is given as: ,…”

Section: Resultsmentioning

confidence: 99%

“…The amount of organic matter (OM) greatly affects the adsorption process of the pesticides in the soil especially when present in large amounts (ElShafei et al, 2009), mainly because the particles of organic matter or clay provide the soil with an increased number of adsorptive sites onto which pesticides molecules can bind. Despite the complexity of soil organic matter compositions, it has been reported that when OM is low (<5%), adsorption of the pesticide not only may be affected by the organic matter but also other factors such as the type and nature of the pesticide, accessibility of its functional groups, inorganic constituents, and properties of the soil may have a role to play (Von et al, 1991;Weber et al, 1991).…”

Section: Resultsmentioning

confidence: 99%

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Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Rani¹,

Sant²

2014

International Agrophysics

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A b s t r a c t. Experiments were conducted to study the sorption behaviour of dimethoate in three Indian soils at different temperatures. A kinetic study showed that adsorption equilibrium was reached within 15 h at different initial levels of pesticide concentration. Applicability of the pseudo second order kinetic model suggested that the adsorption process was complex and several mechanisms were involved. The Freundlich model explained the adsorption behaviour adequately and the isotherms were of S-type. The adsorption process was found to be strongly affected by temperature. The Gibbs free energy change, ΔGº values (from -15.81 to -16.60 kJ mol -1 ) indicated that the process was spontaneous and exothermic in nature. The change in enthalpy of adsorption, ΔH° values (from -17.729 to -21.539 kJ mol -1 ) suggested that relatively weak H-bond forces were the main driving forces for adsorption. Desorption was found to be concentration-and temperature-dependent with higher desorption occurring at higher temperature and concentration levels. The results signify the importance of temperature in controlling the mobility of dimethoate in water bodies.K e y w o r d s:

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Section: Resultsmentioning

confidence: 99%

“…The Temkin isotherm describes the behaviour of adsorption systems on heterogeneous surfaces. The linear form of the Temkin isotherm (ElShafei et al, 2009) is given as: ,…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Rani¹,

Sant²

2014

International Agrophysics

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“…The entropy (ΔS°), of atrazine and metolachlor is positive, resulting in an increase in the disorder which have been interpreted by ElShafei et al (2009) and Gurses et al (2004) as the increasing degree of freedom of the water molecules as the molecules of herbicides decrease. The positive value of entropy resulted in negative values for ΔG° which indicates spontaneous adsorption processes and that adsorption occurs through a bonding mechanism (ElShafei et al, 2009;Gupta et al, 2006;Shariff , 2011). In general, the value of ΔG° for adsorption decreased with increasing temperature indicating that the interaction of pesticide was spontaneous with high preference of the soil surface.…”

Section: Adsorption Thermodynamic Of Atrazine and Metolachlormentioning

confidence: 97%

“…It incorporates both adsorption at the mineral surface and partitioning into any natural organic matter (ElShafei et al, 2009). Organic matter (OM) greatly aff ects the adsorption process of the pesticides in the soil, mainly because the particles of organic matter or clay provide the soil with an increased number of adsorptive sites onto which pesticides molecules can bind (Rani and Sud Sant, 2014).…”

Section: Dissipation Kinetics and Thermodynamic Analysismentioning

confidence: 99%

Aspect of the degradation and adsorption kinetics of atrazine and metolachlor in andisol soil

Jaikaew

Malhat

Boulangé

et al. 2017

Hellenic Plant Protection Journal

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SummaryThe degradation kinetics and sorption characteristics of atrazine and metolachlor in Japanese andisol soil were evaluated using laboratory incubation of soil samples. The water content of the soil was set to field capacity while three different temperatures (5, 25 and 35°C) were considered for the experiment. First order model fitted the degradation kinetics of both herbicides under the investigated temperature range with half-lives ranging from 19.2 to 46.9 days for atrazine and from 23.4 to 66.9 days for metolachlor, respectively. The activation energies (Ea) of atrazine and metolachlor calculated using Arhenius equation were 21.47 and 23.91 kJ mol−1, respectively. The soil sorption study was conducted using the batch equilibrium process. The adsorption behaviors of atrazine and metolachlor were investigated using linear, Freundlich and Langmuir isotherms although the linear and Freundlich isotherms gave relatively high correlation coefficient (R2) and very low standard error of estimate (SEE). The free energy (ΔG°) values were in the range −30.6 to −32.0 kJ/mol, and −32.1 to −41.5 kJ/mol for atrazine and metolachlor, respectively. Thermodynamic parameters indicated that the adsorption is spontaneous, endothermic accompanied by increase in entropy. The understanding of atrazine and metolachlor sorption processes is essential to determine the pesticide fate and availability in soil for pest control, biodegradation, runoff and leaching.

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Sorption and mobility assessment of tembotrione in soils of upper, trans and middle Gangetic plain zones of India

Ghoshal,

Dixit,

Narayanan

et al. 2024

Biomedical Chromatography

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The presence of undesired agrochemicals residues in soil and water poses risks to both human health and the environment. The behavior of pesticides in soil depends both on the physico‐chemical properties of pesticides and soil type. This study examined the adsorption–desorption and leaching behavior of the maize herbicide tembotrione in soils of the upper (UGPZ), trans (TGPZ) and middle Gangetic plain zones of India. Soil samples were extracted using acetone followed by partitioning with dichloromethane, whereas liquid–liquid extraction using dichloromethane was used for aqueous samples. Residues of tembotrione and its metabolite TCMBA, {2‐chloro‐4‐(methylsulfonyl)‐3‐[(2,2,2‐trifluoroethoxy) methyl] benzoic acid}, were quantified using liquid chromatography–tandem mass spectrometry. The data revealed that tembotrione adsorption decreased with increasing pH and dissolved organic matter but increased with salinity. The maximum adsorption occurred at pH 4, 0.01 m sodium citrate and 4 g/L NaCl, with corresponding Freundlich constants of 1.83, 2.28 and 3.32, respectively. The hysteresis index <1 indicated faster adsorption than desorption. Leaching studies under different flow conditions revealed least mobility in UGPZ soil and high mobility in TGPZ soil, consistent with groundwater ubiquity scores of 4.27 and 4.81, respectively. Soil amendments decreased tembotrione mobility in the order: unamended > wheat straw ash > wheat straw > farm yard manure > compost. The transformation of tembotrione to TCMBA and its mobility in soil columns were also assessed.

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Kinetics and thermodynamics of adsorption of cadusafos on soils

Cited by 55 publications

References 44 publications

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Time and temperature dependent sorption behaviour of dimethoate pesticide in various Indian soils

Aspect of the degradation and adsorption kinetics of atrazine and metolachlor in andisol soil

Sorption and mobility assessment of tembotrione in soils of upper, trans and middle Gangetic plain zones of India

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