Glyphosate behavior at soil and mineral–water interfaces

Pessagno, Romina C.; Sánchez, Rosa M. Torres; Afonso, Marı́a dos Santos

doi:10.1016/j.envpol.2007.12.025

Cited by 67 publications

(46 citation statements)

References 43 publications

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“…Additionally, we found that clay content explained only approximately 5 % of the Kd eq and Kf variability (Tables 6, 7). This corroborates the hypothesis that for the sorption rate, the clay mineralogy and its associated properties, such as the specific surface area, saturating cation or isoelectric point, may be more important than the clay content (Borggaard and Gimsing 2008;da Cruz et al 2007;Kogan et al 2003;Mcconnell and Hossner 1985;Pessagno et al 2008). Significant correlations were found between organic carbon and Kd eq or Kf (Table 6), although organic carbon only slightly increased the R 2 value obtained in the multiple regression analyses of Kf.…”

Section: Glyphosate Sorption: Mechanisms and Predictionsupporting

confidence: 88%

“…Finally, glyphosate and phosphate have been reported to exhibit similar sorption mechanisms, thereby leading to potential competition for sorption sites (Gimsing and Borggaard 2002). These sorption mechanisms are evidenced by the influence of clay content (Beltran et al 1998;Borggaard and Gimsing 2008;da Cruz et al 2007;Dion et al 2001;Ololade et al 2014;Pessagno et al 2008;Singh et al 2014;Xu et al 2009), iron-and aluminum-oxide content (de Jonge et al 2001;Gimsing et al 2004Gimsing et al , 2007Mamy and Barriuso 2005;Morillo et al 2000;Pessagno et al 2008;Wang et al 2005), pH (Accinelli et al 2005;Al-Rajab et al 2008;Borggaard and Gimsing 2008;da Cruz et al 2007;de Jonge and Wollesen de Jonge 1999;Dousset et al 2007;Gimsing et al 2004;Mamy and Barriuso 2005;Xu et al 2009;Zhou et al 2004), phosphorus content (de Jonge et al 2001;Gimsing and Borggaard 2002), organic carbon (Albers et al 2009;da Cruz et al 2007;Morillo et al 2000;Ololade et al 2014;Pessagno et al 2008;Wang et al 2005) and the cation exchange capacity (CEC) (da Cruz et al 2007;de Jonge and Wollesen de Jonge 1999;Mamy and Barriuso 2005;…”

Section: Introductionmentioning

confidence: 93%

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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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Section: Glyphosate Sorption: Mechanisms and Predictionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 93%

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

2015

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“…Based on previous studies, we expected that glyphosate and AMPA would be more strongly adsorbed in soils with a higher Fe-oxide (especially Fe d ) content (Mentler et al, 2007;Pessagno et al, 2008 (Barja et al, 2001;Gimsing et al, 2004;Morillo et al, 2000;Zhou et al, 2004) and even higher contents of amorphous Fe-oxides (Fe o ) lead to higher sorption of glyphosate and AMPA, probably due to a larger and more reactive surface area of amorphous Fe-oxides. Thus, Fe-oxides in general seem to be a key parameter for glyphosate and AMPA adsorption in soils.…”

Section: Resultsmentioning

confidence: 99%

Adsorption of glyphosate and aminomethylphosphonic acid in soils

Rampazzo¹,

Todorovic²,

Mentler³

et al. 2013

International Agrophysics

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A b s t r a c t. The results showed that glyphosate is initially adsorbed mostly in the upper 2 cm. It is than transported and adsorbed after few days in deeper soil horizons with concomitant increasing content of its metabolite aminomethylphosphonic acid. Moreover, Fe-oxides seem to be a key parameter for glyphosate and aminomethylphosphonic adsorption in soils. This study confirmed previous studies: the analysis showed lower contents of dithionite-soluble and Fe-oxides for the Chernozem, with consequently lower adsorption of glyphosate and aminomethylphosphonic as compared with the Cambisol and the Stagnosol.K e y w o r d s: adsorption, glyphosate, aminomethylphosphonic acid, soils

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“…Agrophys., 2014Agrophys., , 28, 93-100 doi: 10.2478Agrophys., /intag-2013 environmental impact, but sometimes controversial. It seems to be that particularly pedogenical Fe-(and Al-) oxides have a strong capacity of glyphosate adsorption through covalent bonds (Gimsing and Borggaard, 2002;Pessagno et al, 2008;Rampazzo et al, 2013); therefore, the transport of glyphosate and AMPA from land to water environments seems very limited.…”

Section: Introductionmentioning

confidence: 99%

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

Todorovic

Rampazzo

Mentler

et al. 2014

International Agrophysics

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A b s t r a c t. Erosion processes can strongly influence the dissipation of glyphosate and aminomethylphosphonic acid applied with Roundup Max® in agricultural soils; in addition, the soil structure state shortly before erosive precipitations fall can be a key parameter for the distribution of glyphosate and its metabolite. Field rain simulation experiments showed that severe erosion processes immediately after application of Roundup Max® can lead to serious unexpected glyphosate loss even in soils with a high presumed adsorption like the Cambisols, if their structure is unfavourable. In one of the no-tillage-plot of the Cambisol, up to 47% of the applied glyphosate amount was dissipated with surface run-off. Moreover, at the Chernozem site with high erosion risk and lower adsorption potential, glyphosate could be found in collected percolation water transported far outside the 2x2 m experimental plots. Traces of glyphosate were found also outside the treated agricultural fields.K e y w o r d s: glyphosate, aminomethylphosphonic acid, erosion, adsorption, soils

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Glyphosate behavior at soil and mineral–water interfaces

Cited by 67 publications

References 43 publications

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

Glyphosate sorption to soils and sediments predicted by pedotransfer functions

Adsorption of glyphosate and aminomethylphosphonic acid in soils

Influence of soil tillage and erosion on the dispersion of glyphosate and aminomethylphosphonic acid in agricultural soils

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