Determination of mobility and adsorption of agrochemicals on soils

Rhodes, Robert C.; Belasco, I. J.; Pease, Harlan L.

doi:10.1021/jf60169a037

Cited by 59 publications

(30 citation statements)

References 9 publications

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“…3 and 4). The slope of the isotherm steadily decreases with rise in solute concentration because of vacant sites become less accessible with the progressive covering of the surface (Rhodes et al 1970). Nonlinear isotherm indicates that a number of available sites for the sorption become a limiting factor, which may be due to the fact that flubendiamide molecules occupy most of the sorption sites at the higher concentrations.…”

Section: Resultsmentioning

confidence: 99%

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Das

Mukherjee

Kumar

2015

Environ Monit Assess

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Laboratory study on adsorption-desorption of flubendiamide was conducted in two soil types, varying in their physical and chemical properties, by batch equilibrium method. After 4 h of equilibrium time, adsorption of flubendiamide on soil matrix exhibited moderately low rate of accumulation with 4.52 ± 0.21% in red soil and low rate with 3.55 ± 0.21% in black soil. After amending soils with organic manure, adsorption percentage increased to 6.42 ± 0.21% in red soil and (4.18 ± 0.21%) in black soil indicating that amendment significantly increased sorption. Variation in sorption affinities of the soils as indicated by distribution coefficient (K d) for sorption was in the range of 2.98-4.32, 4.91-6.64, 1.04-1.45 and 1.92-2.81 ml/g for red soil, organic manure-treated red soil, black soil and organic manure-treated black soil, respectively. Desorption was slightly slower than adsorption indicating a hysteresis effect having hysteresis coefficient ranges between 0.023 and 0.149 in two test soils. The adsorption data for the insecticide fitted well the Freundlich equation. Results revealed that adsorption-desorption was influenced by soil types and showed that the maximum sorption and minimum desorption of the insecticide was observed in soils with higher organic carbon and clay content. It can be inferred that crystal lattice of the clay soil plays a significant role in flubendiamide adsorption and desorption. Adsorption was lower at acidic pH and gradually increased towards alkaline pH. As this insecticide is poorly sorbed in the two Indian soil types, there may be a possibility of their leaching to lower soil profiles.

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Section: Resultsmentioning

confidence: 99%

Effect of soil type and organic manure on adsorption–desorption of flubendiamide

Das

Mukherjee

Kumar

2015

Environ Monit Assess

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“…Malik & Drennan (1989) observaram aumentos na sorção do fluridone ao utilizarem a relação 1:1, comparada com a relação 1:5. Vários autores (Oliveira, 1995;Rhodes et al, 1970;Roowell, 1994;Schroeder, 1994) também constataram que aumentos nos teores de CO resultam em aumentos na afinidade dos pesticidas pelo solo. Assim como observado por Werkheiser & Anderson (1996), verifica-se que, à exceção do LE, para solos com pH semelhante, os maiores coeficientes de sorção para o flazasulfuron foram obtidos nos solos com maiores teores de CO.…”

Section: Sorção/dessorção Do Flazasulfuronunclassified

Sorção e hidrólise do herbicida flazasulfuron

2005

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4RESUMO -O herbicida flazasulfuron vem sendo utilizado no Brasil para o controle de plantas daninhas mono e dicotiledôneas nas culturas de cana-de-açúcar e tomate. Há carência de informações sobre o seu comportamento no ambiente. O objetivo deste trabalho foi estudar a retenção do flazasulfuron em amostras de solos, superficiais e subsuperficiais, e sua hidrólise em diferentes valores de pH e temperatura. Nos ensaios de sorção e dessorção utilizou-se metodologia de batelada em equilíbrio nas concentrações de 0,07 a 5,00 mg L (1/n ads = 0,40) a 27,97 (1/n ads = 0,90), apresentando correlação positiva e significativa com os teores de CO, silte e CTC. A adsorção do flazasulfuron foi menor nas amostras com maiores valores de pH, indicando maior risco de lixiviação nessa condição.Palavras-chave: sulfoniluréias, retenção, solo. ABSTRACT -Flazasulfuron [1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-trifluoromethyl-2-pyridylsulfonyl) urea] has been used in Brazil the selective control of monocotyledonous and dicotyledonous weeds grown in the sugarcane and tomato crops. There is a lack of information in the literature about flazasulfuron behavior in soils. In this study, flazasulfuron retention was measured in batch equilibration

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“…It is suggested that the relltwe adsorption/desorption potentiat of a herbicide may provide i-mechanism by which soil applied herbicides can be biologically inactivated more readily in soils of high organic matter content. (Harris and Sheets 1965), phytotoxicity and mobility of monuron (Harris 1966), and mobility of monuron (May 1975) and diuron (Rhodes et al 1970;Helling 1971) were correlated with the extent of adsorption on the soils studied. The adsorption of a number of urea herbicides has been studied in a variety of soils.…”

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confidence: 90%