GLYPHOSATE SORPTION IN SOILS OF DIFFERENT pH AND PHOSPHORUS CONTENT

Jonge, H. de; Jonge, Lis Wollesen de; Jacobsen, O. H.; Yamaguchi, T.; Møldrup, Per

doi:10.1097/00010694-200104000-00002

Cited by 148 publications

(142 citation statements)

References 14 publications

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“…where C s is the amount of glyphosate adsorbed (µg g -1 ), C m is the maximum amount of glyphosate adsorbed (µg g -1 ), C e is the equilibrium concentration of the herbicide in the solution (µg mL -1 ), K d , K f , and K l are the linear, Freundlich, and Langmuir absorption coefficients, respectively (mL g -1 ), and n is a linearity factor (De Jonge et al, 2001;Zhu & Selim, 2002). The isotherm model parameters were obtained by a non-linear optimization routine in Microcal Origin (Microcal Software Inc., 2000).…”

Section: Methodsmentioning

confidence: 99%

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Kogan

Metz

Ortega

2003

Pesq. agropec. bras.

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The objective of this work was to investigate glyphosate adsorption by soils and its relationship with unoccupied binding sites for phosphate adsorption. Soil samples of three Chilean soils series Valdivia (Andisol), Clarillo (Inceptisol) and Chicureo (Vertisol) were incubated with different herbicide concentrations. Glyphosate remaining in solution was determined by adjusting a HPLC method with a UV detector. Experimental maximum adsorption capacity were 15,000, 14,300 and 4,700 µg g -1 for Valdivia, Clarillo, and Chicureo soils, respectively. Linear, Freundlich, and Langmuir models were used to describe glyphosate adsorption. Isotherms describing glyphosate adsorption differed among soils. Maximum adjusted adsorption capacity with the Langmuir model was 231,884, 17,874 and 5,670 µg g -1 for Valdivia, Clarillo, and Chicureo soils, respectively. Glyphosate adsorption on the Valdivia soil showed a linear behavior at the range of concentrations used and none of the adjusted models became asymptotic. The high glyphosate adsorption capacity of the Valdivia soil was probably a result of its high exchangeable Al, extractable Fe, and alophan and imogolite clay type. Adsorption was very much related to phosphate dynamics in the Valdivia soil, which showed the larger unoccupied phosphate binding sites. However relationship between unoccupied phosphate binding sites and glyphosate adsorption in the other two soils (Clarillo and Chicureo) was not clear.

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Section: Methodsmentioning

confidence: 99%

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Kogan

Metz

Ortega

2003

Pesq. agropec. bras.

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“…Several mechanisms have been proposed to explain the sorption of glyphosate to soils and sediments. The formation of strong Fe-O-P(glyphosate) and Al-O-P(glyphosate) bonds by ligand exchange between the glyphosate phosphonate group and singly coordinated Al-OH and Fe-OH groups on the surfaces of variably charged soil minerals has been proposed as a possible sorption mechanism (Borggaard and Gimsing 2008;de Jonge et al 2001;Dideriksen and Stipp 2003;Mamy and Barriuso 2005;Morillo et al 1997;Nicholls and Evans 1991;Piccolo et al 1994;Wang et al 2006). This mechanism is deemed to occur preferentially on the broken edges of layer silicates, poorly ordered silicates or iron-and aluminum oxides (Borggaard and Gimsing 2008;Dideriksen and Stipp 2003;Laitinen et al 2008;Morillo et al 1997;Ololade et al 2014;Piccolo et al 1994).…”

Section: Introductionmentioning

confidence: 99%

“…This mechanism is deemed to occur preferentially on the broken edges of layer silicates, poorly ordered silicates or iron-and aluminum oxides (Borggaard and Gimsing 2008;Dideriksen and Stipp 2003;Laitinen et al 2008;Morillo et al 1997;Ololade et al 2014;Piccolo et al 1994). The formation of complexes between glyphosate phosphonate groups and the soil-exchanged polyvalent cations has also been suggested to be responsible for the strong sorption of glyphosate to soil (Borggaard and Gimsing 2008;de Jonge et al 2001;de Jonge and Wollesen de Jonge 1999;Mamy and Barriuso 2005;Mcconnell and Hossner 1985;Vereecken 2005). The influence of the soil-exchanged cations on the sorption of glyphosate has been reported to follow the order of Na ?…”

Section: Introductionmentioning

confidence: 99%

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

2015

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Glyphosate is the most applied herbicide for weed control in agriculture worldwide. Excessive application of glyphosate induces water pollution. The transfer of glyphosate to freshwater and groundwater is largely controlled by glyphosate sorption to soils and sediments. Sorption coefficients are therefore the most sensitive parameters in models used for risk assessment. However, the variations in glyphosate sorption among soils and sediments are poorly understood. Here we review glyphosate sorption parameters and their variation with selected soils and sediment. We use this knowledge to build pedotransfer functions that allow predicting sorption parameters, Kd, Kf and n, for a wide range of soils and sediments. We gathered glyphosate sorption parameters, 101 Kf, n and equivalent Kd, and associated soil properties. These data were then used to perform stepwise multiple regression analyses to build the pedotransfer functions. The linear (Kd) and Freundlich (Kf, n) pedotransfer functions were benchmarked against experimental data. We found the following major points: (1) Under current environmental conditions, sorption is best predicted by the Kd pedotransfer function. (2) The pedotransfer function is Kd = 7.20*CEC -1.31*Clay ? 24.82 (Kd in L kg -1 , CEC in cmol kg -1 and clay in %). (3) Cation exchange capacity (CEC) and clay content are the main drivers of Kd variability across soils and sediments. Freundlich parameters are additionally influenced by pH and organic carbon. This suggests that the formation of complexes between glyphosate phosphonate groups and soil-exchanged polyvalent cations dominates sorption across the range of analyzed soils.

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“…Several studies have indicated that soil oxides are the main colloids responsible for sorption of glyphosate in oxidic soils (Hance, 1976, Glass, 1987Gerritse et al, 1996;Prata et al, 2000;Jonge et al, 2001;Prata et al, 2003). In the same way as the specific adsorption of inorganic phosphates to metallic oxides (Tan, 1993), there is the formation of covalent linkages between the methylphosphonic group of glyphosate and the metal present in the soil oxides (Piccolo et al, 1994;Cheah et al, 1997).…”

Section: Introductionmentioning

confidence: 99%

Glyphosate behavior in a Rhodic Oxisol under no-till and conventional agricultural systems

Prata¹,

Lavorenti

Regitano

et al. 2005

Rev. Bras. Ciênc. Solo

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SUMMARYThe behavior of glyphosate in a Rhodic Oxisol, collected from fields under no-till and conventional management systems in Ponta Grossa, Parana state (Brazil) was investigated. Both agricultural systems had been in production for 23 years. Glyphosate mineralization, soil-bound forms, sorption and desorption kinetics, sorption/desorption batch experiments, and soil glyphosate phythoavailability (to Panicum maximum) were determined. The mineralization experiment was set up in a completely randomized design with a 2 x 2 factorial scheme (two management systems and two 14 C radiolabelled positions in the glyphosate), with five replicates. 14 CO 2 evolution was measured in 7-day intervals during 63 days. The glyphosate sorption kinetics was investigated in a batch experiment, employing a glyphosate concentration of 0.84 mg L -1 . The equilibration solution was 0.01 mol L -1 CaCl 2 and the equilibration times were 0, 10, 30, 60, 120, 240, and 360 min. Sorption/desorption of glyphosate was also investigated using equilibrium batch experiments. Five different concentrations of the herbicide were used for sorption (0.42, 0.84, 1.68, 3.36, and 6.72 mg L -1 ) and one concentration for desorption. Glyphosate phytoavailability was analyzed in a 2 x 5 factorial scheme with two management systems and five glyphosate concentrations added to soil (0, 4.2, 8.4, 42.0, and 210.0 µg g -1 ) in a completely (1) randomized design. Phytotoxicity symptoms in P. maximum were evaluated for different periods. The soil under both management systems showed high glyphosate sorption, which impeded its desorption and impaired the mineralization in the soil solution. Practically the total amount of the applied glyphosate was quickly sorbed (over 90 % sorbed within 10 min). Glyphosate bound to residues did not have adverse effects on P. maximum growth. The mineralization of glyphosate was faster under no-till and aminomethylphosphonic acid was the main glyphosate metabolite.Index terms: herbicide, sorption, degradation, mineralization, phytotoxicity, Panicum maximum. de 0, 10, 30, 60, 120, 240 e 360 min após a aplicação do herbicida. Os tempos utilizados na cinética de dessorção foram de 0, 1, 4, 12, 24, 36, 48, 72 herbicida: 0,42; 0,84; 1,68; 3,36 e 6,72 mg L -1 RESUMO: COMPORTAMENTO DO GLIFOSATO NUM LATOSSOLO VERMELHO SOB PLANTIO DIRETO E CONVENCIONAL

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GLYPHOSATE SORPTION IN SOILS OF DIFFERENT pH AND PHOSPHORUS CONTENT

Cited by 148 publications

References 14 publications

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Adsorption of glyphosate in chilean soils and its relationship with unoccupied phosphate binding sites

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

Glyphosate behavior in a Rhodic Oxisol under no-till and conventional agricultural systems

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