Adsorption of glyphosate in a forest soil: a study using Mössbauer and FT-IR spectroscopy

Benetoli, Luís Otávio de Brito; Carneiro, Cristine Elizabeth Alvarenga; Zaia, Dimas Augusto Morozin; Ferreira, Ailton Silva; Paesano, Andrea; Thaïs, Cássia; Zaia, B. V.

doi:10.1590/s0100-40422010000400017

Cited by 9 publications

(3 citation statements)

References 39 publications

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“…GLY sorption is favoured in acidic environments 63 , 67 , due to the protonated soil solution that promotes the formation of different GLY speciation forms with a positive net charge, facilitating the formation of GLY functional group complexes (R-NH, R-COOH and R-PO(OH)) with the metals present in those soils 68 , 69 . Previous studies 10 , 70 – 72 consider that amorphous metal oxides and hydroxides play a major role in GLY sorption.…”

Section: Discussionmentioning

confidence: 99%

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

Silva

Nicola

DUDAS

et al. 2021

Sci Rep

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With the growing global concern on pesticide management, the relationship between its environmental recalcitrance, food security and human health has never been more relevant. Pesticides residues are known to cause significant environmental contamination. Here, we present a case study on long-term no-tillage farming systems in Brazil, where Glyphosate (GLY) has been applied for more than 35 years. GLY and its main breakdown product, aminomethylphosphonic acid (AMPA) were determined in topsoil (0–10 cm) samples from no-tillage fields and nearby subtropical secondary forests by high-performance liquid chromatography coupled with a fluorescence detector. In addition, the presence of carbamates, organochlorines, organophosphates and triazines were also screened for. GLY and AMPA were present in all soil samples, reaching values higher than those described for soils so far in the literature. A significant decrease for AMPA was observed only between the secondary forest and the farm's middle slope for site B. GLY and AMPA were observed respectively at peak concentrations of 66.38 and 26.03 mg/kg soil. GLY was strongly associated with forest soil properties, while AMPA associated more with no-tillage soil properties. Soil texture was a significant factor contributing to discrimination of the results as clay and sand contents affect GLY and AMPA retention in soils. This was the first study to report DDT and metabolites in consolidated no-tillage soils in Brazil (a pesticide fully banned since 2009). Based on human risk assessment conducted herein and the potential risk of GLY to local soil communities, this study offers a baseline for future studies on potential adverse effects on soil biota, and mechanistic studies.

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Section: Discussionmentioning

confidence: 99%

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

Silva

Nicola

DUDAS

et al. 2021

Sci Rep

View full text Add to dashboard Cite

show abstract

“…GLY sorption is favoured in acidic environments 63,67 , due to the protonated soil solution that promotes the formation of different GLY speciation forms with a positive net charge, facilitating the formation of GLY functional group complexes (R-NH, R-COOH and R-PO(OH)) with the metals present in those soils 68,69 . Previous studies 9,[70][71][72] consider that amorphous metal oxides and hydroxides play a major role in GLY sorption.…”

Section: Discussionmentioning

confidence: 99%

How Far Can Pesticides Spread? A Case Study on No-Tillage Farming Systems and Surrounding Forest Patches

Silva¹,

Nicola²,

DUDAS³

et al. 2020

Preprint

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With the growing global concern on pesticide management, the relationship between its environmental recalcitrance, food security and human health has never been more relevant. Pesticides residues are known to cause significant environmental contamination. The present study focused on long-term no-tillage farming systems and subtropical forests in Brazil, where Glyphosate (GLY) has been applied for more than 35 years. GLY and the main breakdown product of glyphosate, aminomethylphosphonic acid (AMPA) were determined by high-performance liquid chromatography coupled with a fluorescence detector. In addition, the presence of carbamates, organochlorines, organophosphates and triazines were also detected. GLY and AMPA were omnipresent in soil samples, reaching values higher than those described for soils previously in the literature. GLY and AMPA were observed respectively at peak concentrations of 66.38 and 26.03 mg/kg soil. GLY was strongly associated with forest soil properties, while AMPA associated with no-tillage soil properties. The texture was a significant factor that contributed to the maximum discrimination of the results since clay and sand contents influence GLY and AMPA retention in soils. This was the first study to report DDT and metabolites in consolidated no-tillage soils in Brazil (a pesticide fully banned 2009). Based on human risk assessment and the potential risk of GLY to local soil communities, this study offers a baseline for future studies that will be crucial to understand the toxicity mechanisms on non-target soil biota.

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“…Besides, the initial pH in range of 4 to 10, the final pH at around pHPZC value was determined. Glyphosate is a zwitterion with pKa values of for first phosphonic pKa2 = 2.2; for second phosphonic pKa3 = 5.4 and for amine pKa4 = 10.2 [30]. The pH-dependent of glyphosate was found decreasing when increasing pH.…”

Section: Determination Of Phpzcmentioning

confidence: 94%

Chitosan beads as the adsorbent for glyphosate removal from an aqueous solution

et al. 2020

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Chitosan beads were prepared to remove glyphosate from an aqueous solution via a batch adsorption system. The optimum conditions, including initial glyphosate concentration, adsorbent dose, and contact time, were investigated. Increasing the initial glyphosate concentration increased the equilibrium adsorption capacity onto the chitosan beads. The rapid sorption of glyphosate was found at an initial contact time of 30 min. The maximum adsorption capacity from 35 mgÂ·L-1 glyphosate in solution onto 0.1 g chitosan beads was 12.7 mgÂ·g-1. Increasing amount chitosan to 0.5 g dosage could remove more than 94% of the glyphosate for all initial glyphosate concentrations (1â€“35 mgÂ·L-1), pH 7, and room temperature. The pHPZC value of chitosan surface was determined approximately at pH 8.The glyphosate removal by chitosan bead was favored at pH below pHPZC. The effects on the adsorption capacity, adsorption isotherm, and kinetics model were evaluated. The glyphosate uptake behavior fitted with the Freundlich adsorption model, while the kinetic adsorption fitted a pseudo-second order. The adsorption of glyphosate was proposed to be by electrostatic interaction between the negatively charged â€“PO(OH)- and â€“COO- groups, and the positively charged â€“NH3+ groups of chitosan.

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Adsorption of glyphosate in a forest soil: a study using Mössbauer and FT-IR spectroscopy

Cited by 9 publications

References 39 publications

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

Pesticides in a case study on no-tillage farming systems and surrounding forest patches in Brazil

How Far Can Pesticides Spread? A Case Study on No-Tillage Farming Systems and Surrounding Forest Patches

Chitosan beads as the adsorbent for glyphosate removal from an aqueous solution

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