Pesticide soil sorption parameters: theory, measurement, uses, limitations and reliability

Wauchope, R. D.; Yeh, Simon; Linders, Jan; Kloskowski, R.; Tanaka, Keiji; Rubin, Baruch; Katayama, Arata; Kördel, Werner; Gerstl, Z.; Lane, Michael C. G.; Unsworth, John

doi:10.1002/ps.489

Cited by 499 publications

(419 citation statements)

References 346 publications

(434 reference statements)

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“…A matéria orgânica apresenta grande influência nos processos de sorção de herbicidas bases fracas em solos (Oliveira Jr. et al, 2001;Wauchope et al, 2002). Em geral, quanto mais alto o teor de matéria orgânica, maior será a sorção do herbicida e, com isso, menor o potencial de lixiviação (Rossi et al, 2005).…”

Section: Resultsunclassified

Sorção e dessorção do ametryn em Latossolos brasileiros

Silva¹,

Silva²,

D'Antonino³

et al. 2012

Planta daninha

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RESUMO -O conhecimento dos processos de retenção de herbicidas em solo é fundamental para se prever o potencial de lixiviação e degradação e a eficiência no controle das plantas daninhas. Objetivou-se com este trabalho avaliar os processos de sorção e dessorção do ametryn em quatro solos brasileiros: Latossolo Vermelho-Amarelo (LVA), Latossolo VermelhoAmarelo húmico (LVAh), Latossolo Vermelho (LV) e Latossolo Amarelo (LA), com diferentes valores de pH. Para isso, utilizou-se o método Batch Equilibrium em condições controladas de laboratório e análise por cromatografia líquida de alta eficiência, com detector UV-Vis a 245 nm. Considerando os valores da constante de Freundlich modificada (K' f ), verificou-se, entre os solos estudados, a ordem crescente de sorção do ametryn: LV pH 6,06 < LV pH 5,00 < LA pH 6,30 < LVA pH 6,11 < LVA pH 5,40 < LVAh pH 6,24 < LVAh pH 4,8. Conclui-se que as características teor de matéria orgânica e pH dos solos estudados afetaram a sorção e a dessorção do ametryn. Verificou-se também que solos com maiores teores de matéria orgânica foram os que apresentaram as maiores taxas de sorção, além das menores porcentagens de dessorção, indicando a ocorrência de histerese.Palavras-chave: herbicida, solo, batch equilibrium, cromatografia líquida, isotermas de Freundlich.ABSTRACT -Knowledge of herbicide retention processes in soil is fundamental to predict leaching potential, degradation, and weed control efficiency. The objective of this study was to evaluate the processes of sorption and desorption of ametryn in four Brazilian soils: Red-Yellow Latosol (LVA), Red-Yellow humic Latosol (LVAh), Red Latosol (LV), and Yellow Latosol (LA), with different pH values. Thus, the method "Batch Equilibrium" was applied under controlled laboratory conditions, and analysis by high performance liquid chromatography using UV-Vis detector at 245 nm. Considering the values of the modified Freundlich constant (K'f), the following increasing sorption order of ametryn was verified: LV pH 6.06 <5.00 LV pH <6.30 LA pH <6.11 pH LVA

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Section: Resultsunclassified

Sorção e dessorção do ametryn em Latossolos brasileiros

Silva¹,

Silva²,

D'Antonino³

et al. 2012

Planta daninha

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“…The ratio of maximum to minimum K oc values ranged from 1.4 for alachlor to 6.6 for atrazine, a variability that is commonly observed in surface soils. [14] These results suggest that organic carbon may not be the sole sorbent in these soils and/or the organic matter in these soils may have differing sorptivities to these herbicides. The processes influencing differential herbicide sorption in these soils were not investigated, and a number of factors can affect the variation in sorption coefficients.…”

Section: Sorption Coefficientsmentioning

confidence: 89%

“…Sorption coefficients for alachlor, pendimethalin and simazine were significantly correlated (p<0.05) with organic carbon contents, but K d values for the remaining five herbicides were not correlated with the weight fraction of organic carbon in soil. Because organic carbon is widely identified as the primary sorbent of hydrophobic organic compounds, [14] K oc values are often observed to be less variable than K d values. In this study, organic-carbon normalized sorption coefficients (K oc ) were less variable than K d values across the seven soils only for the triazine (atrazine and simazine) and chloroacetanilide (alachlor) herbicides.…”

Section: Sorption Coefficientsmentioning

confidence: 99%

Sorption and predicted mobility of herbicides in Baltic soils

Sakaliene¹,

Papiernik

Koskinen

et al. 2007

Journal of Environmental Science and Health, Part B

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This study was undertaken to determine sorption coefficients of eight herbicides (alachlor, amitrole, atrazine, simazine, dicamba, imazamox, imazethapyr, and pendimethalin) to seven agricultural soils from sites throughout Lithuania. The measured sorption coefficients were used to predict the susceptibility of these herbicides to leach to groundwater. Soil-water partitioning coefficients were measured in batch equilibrium studies using radiolabeled herbicides. In most soils, sorption followed the general trend pendimethalin>alachlor>atrazine∼amitrole∼simazine>imazethapyr>imazamox>dicamba, consistent with the trends in hydrophobicity (log K ow ) except in the case of amitrole. For several herbicides, sorption coefficients and calculated retardation factors were lowest (predicted to be most susceptible to leaching) in a soil of intermediate organic carbon content and sand content. Calculated herbicide retardation factors were high for soils with high organic carbon contents. Estimated leaching times under saturated conditions, assuming no herbicide degradation and no preferential water flow, were more strongly affected by soil textural effects on predicted water flow than by herbicide sorption effects. All herbicides were predicted to be slowest to leach in soils with high clay and low sand contents, and fastest to leach in soils with high sand content and low organic matter content. Herbicide management is important to the continued increase in agricultural production and profitability in the Baltic region, and these results will be useful in identifying critical areas requiring improved management practices to reduce water contamination by pesticides.

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“…This behavior is reasonably approximated by an instantaneous equilibrium [42]. It can be explained on the basis that initially there is a rapid reversible sorption of the solute adhering to accessible sites on the soil surface [43].…”

Section: Adsorption Trendsmentioning

confidence: 97%

Remediation of deltamethrin contaminated cotton fields: residual and adsorption assessment

et al. 2016

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Pakistan occupies a significant global position in the growing of high quality cotton. The extensive application of pesticides on agricultural products leads to environmental risk due to toxic residues in air, water and soil. This study examined the chemodynamic effect of Deltamethrin on cotton fields. Samples were collected from the cotton fields of D.G. Khan, Pakistan and analyzed for heavy metal speciation patterns. Batch experiments were administered in order to study the adsorption of Deltamethrin in cotton fields. The effect of different factors including pH, adsorbate dose, and adsorbent mass on adsorption were studied. It was observed that in general, adsorption increased with increases in the mass of adsorbate, although the trends were irregular. Residual fractions of deltamethrin in the soil and water of cotton fields were analyzed to assess concentrations of xenobiotics bound to soil particles. Results indicated that such residues are significantly higher in soil samples due to high Koc in comparison to water, indicating the former is an efficient degradation agent. Results from the batch experiment resulted in 95% removal with alkaline pH and an adsorbent-adsorbate ratio of 250:1. These results may be used to environment friendly resource management policies.

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Pesticide soil sorption parameters: theory, measurement, uses, limitations and reliability

Cited by 499 publications

References 346 publications

Sorção e dessorção do ametryn em Latossolos brasileiros

Sorção e dessorção do ametryn em Latossolos brasileiros

Sorption and predicted mobility of herbicides in Baltic soils

Remediation of deltamethrin contaminated cotton fields: residual and adsorption assessment

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