Soil Sorption of Acidic Pesticides

Spadotto, C. A.; Hornsby, Arthur G.

doi:10.2134/jeq2003.0949

Cited by 32 publications

(35 citation statements)

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“…It is well established that the sorption of weakly acidic compounds is pH dependent, their sorption is favored at pH values close to and below their pK a values, and conformational changes in the soil organic matter have been proposed to contribute to sorption of such compounds at low pH values [38]. The presence of the sulfate group in E1-3S reduces the possibility for hydrophobic interaction as opposed to E1.…”

Section: Resultsmentioning

confidence: 99%

Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand

Scherr

Sarmah

et al. 2009

Enviro Toxic and Chemistry

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Abstract-Estrone (E1) and its sulfate conjugate estrone-3-sulfate (E1-3S) are released to the environment in animal wastes in significant amounts, and direct exposure occurs in grazed pasture systems. Both compounds have been shown to potentially contribute to endocrine disruption in wildlife, and knowledge about the sorption behavior of these compounds is necessary for a sound risk assessment. For labile compounds such as E1 and E1-3S, however, the standard protocols might overestimate sorption by not considering metabolite formation or allowing for equilibration that exceeds the commonly reported half-lives of these compounds. We therefore conducted modified batch sorption experiments with 0.005 M calcium chloride (CaCl 2 ) and artificial urine solution to determine the influence of the mediator solution on the sorption of E1 and E1-3S in three pasture soils from New Zealand. Sorption isotherms of both compounds were nonlinear, and the Freundlich equation was found adequate to describe the isotherms. The sorption potential of E1-3S was about one order of magnitude lower than for the free counterpart, and the K f values significantly changed between the two mediator solutions. The calculation of concentration-dependent effective distribution coefficients (K eff d ) revealed that for a range of realistic exposure concentrations in a grazed dairy system, the common approach of using CaCl 2 would deliver incorrect inferences for a sound risk assessment.

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Section: Resultsmentioning

confidence: 99%

Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand

Scherr

Sarmah

et al. 2009

Enviro Toxic and Chemistry

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“…Auxin-mimicking herbicides sorption such as picloram and 2.4-D is positively correlated with the soil organic matter content (Spadotto et al, 2003). Among the biosolids main characteristics that may influence soil sorption potential are (solid or dissolved) organic matter content, ionic composition and pH value.…”

Section: Picloram + 24-d Leaching Testmentioning

confidence: 99%

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

et al. 2018

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-Biosolids are residues from the treatment of urban fluids used as a source of nutrients for agricultural and forestry crops. The organic matter contained in this residue and its chemical characteristics may interfere with the behavior of herbicides in the soil. The objective of this study was to evaluate the influence of biosolids on the potential for leaching herbicides mimicking auxin. Two simultaneous experiments were performed: a leaching test of picloram + 2.4-D in soil column with addition of thermally treated biosolids or solarized biosolids and another one to evaluate the effect of leachate application from the leaching tests under inert material. Each type of biosolid was incorporated in sandy soil in the proportions of 0%, 50%, 100% and 150% of the maximum recommended dose for subsurface fertilization for eucalyptus. The soil was conditioned in PVC columns and the herbicide columns based on picloram + 2.4-D (Turuna® Commercial Formulation), corresponding to 240 g L -1 of 2.4-D + 64 g L -1 of picloram at a dose of 3.5 L ha -1 of the commercial product. The columns were submitted to rain simulation and the resulting leachate was collected, followed by its application in sand-filled pots. The Cucumis sativus was sown along the profile of the soil columns and in the pots. The incorporation of the biosolid, independently of the type and dose tested did not interfere in the leaching potential of picloram + 2.4-D. Symptoms of intoxication were observed along all soil columns and pots. Therefore this residue is not very effective for the resolution of environmental problems caused by the leaching of auxin-mimicking herbicides in the soil. Keywords

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“…(Spadotto, 2003;Hamadi, 2004;Kumar, 2003;Witbowo, 2007;Yuh-Shan, 2006;Mashayekhi, 2006;Tsui, 2007) They were aimed at plotting the adsorption isotherms due to which it is possible to compare the sorption capacities of different adsorbats on different adsorbents. Selected adsorbent, previously degassed, washed with distilled water and dried, was ground in spherical mortar and dried in electric drier at 150 °C for 3 hours till constant weight.…”

Section: Sorption Proceduresmentioning

confidence: 99%

Low-Cost Sorbent for Removing Pesticides during Water Treatment

Ignatowicz¹

2011

Pesticides - Formulations, Effects, Fate

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Soil Sorption of Acidic Pesticides

Cited by 32 publications

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Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand

Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

Low-Cost Sorbent for Removing Pesticides during Water Treatment

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Soil Sorption of Acidic Pesticides

Cited by 32 publications

References 0 publications

Sorption of estrone and estrone‐3‐sulfate from CaCl2 solution and artificial urine in pastoral soils of New Zealand

Sorption of estrone and estrone‐3‐sulfate from CaCl2 solution and artificial urine in pastoral soils of New Zealand

Biosolids in Leaching of Herbicides Mimicking Auxin in Tropical Soils

Low-Cost Sorbent for Removing Pesticides during Water Treatment

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Product

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Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand

Sorption of estrone and estrone‐3‐sulfate from CaCl₂ solution and artificial urine in pastoral soils of New Zealand