Adsorption of difenzoquat on montmorillonite: model calculations and increase in hydrophobicity

Rytwo, Giora; Tavasi, Mordechai; Afuta, Shmuel; Nir, Shlomo

doi:10.1016/j.clay.2003.03.005

Cited by 36 publications

(23 citation statements)

References 20 publications

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“…Also, according to Calderbank [12], some clays in soil dramatically reduce the herbicidal power of both compounds. More recent studies have shown that these herbicides have a high affinity for clay surfaces in relation to soil organic matter, especially as compared with inorganic cations [13][14][15][16][17]. Their interactions with clay particles depend on the particular type of clay.…”

Section: Introductionmentioning

confidence: 99%

Effect of organic matter and iron oxides on quaternary herbicide sorption–desorption in vineyard-devoted soils

Pateiro

Pérez-Novo

Arias‐Estévez

et al. 2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Effect of organic matter and iron oxides on quaternary herbicide sorption–desorption in vineyard-devoted soils

Pateiro

Pérez-Novo

Arias‐Estévez

et al. 2009

Journal of Colloid and Interface Science

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“…Based on this concentration limit beyond which detectable levels of thiram were obtained in the solution phase, the capacity of soil for thiram was determined to be greater than 6 mg/kg. The capacity would be more for charged adsorbates due to the charge of soil particles (Rytwo et al, 2004).…”

Section: Resultsmentioning

confidence: 99%

Solvent extraction followed by ultraviolet detection for investigation of tetramethylthiuram disulfide at soil-water interface

Priyantha

Navaratne

Ekanayake

et al. 2008

Int. J. Environ. Sci. Technol.

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ABSTRACT:Tetramethylthiuram disulfide is a widely used pesticide and a soil treatment agent in the agricultural sector. Consequently, its detection in the environment and investigation of the distribution between the aqueous and soil phases would be of highly importance. In this study, the detection of tetramethylthiuram disulfide in CHCl 3 was successfully achieved through absorbance measurements at 280 nm, which resulted in linear calibration curves. This detection method was extended for the determination of the partition coefficient (K D ) of tetramethylthiuram disulfide between CHCl 3 and H 2 O phases at ambient temperature. The partition coefficient was subsequently used to determine the apparent partition coefficient (K D ) of tetramethylthiuram disulfide between sieved soil of diamater < 2.0 mm used for agricultural practices and water where by the quantification of tetramethylthiuram disulfide in water after adsorption equilibrium with soil was achieved through a solvent extraction step of tetramethylthiuram disulfide-contaminated water into CHCl 3 . The K D determined for an initial tetramethylthiuram disulfide concentration ranging from 3.00 ppm to 10.00 ppm showed a decreasing trend, which leveled off at high concentrations, indicating the strong irreversible adsorption behavior of tetramethylthiuram disulfide on soil at low concentrations. The proposed detection method would have the potential to determine the extent of adsorption of tetramethylthiuram disulfide in soil or its levels in water when tetramethylthiuram disulfide is introduced to soil systems for agricultural practices.

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“…These charges are compensated by exchangeable hydrated inorganic cations. Pesticides, in a cationic form, such as chlordimeform, diquat, paraquat and difenzoquat can substitute to inorganic cations at the clay mineral geosorbent surface by cation-exchange processes (Weber & Weed, 1968, Rytwo et al, 2004. Cation exchange is also relevant for triazines (Sannino et al, 1999, Herwig et al, 2001) even though their pKa is lower than the pH of common soils (Kah & Brown, 2006).…”

Section: Interactions Between Chemicals and Geosorbentsmentioning

confidence: 99%

Sorption of Pesticides on Natural Geosorbents

Gagné¹,

Gouteux²,

Soubaneh³

et al. 2011

Pesticides - Formulations, Effects, Fate

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Adsorption of difenzoquat on montmorillonite: model calculations and increase in hydrophobicity

Cited by 36 publications

References 20 publications

Effect of organic matter and iron oxides on quaternary herbicide sorption–desorption in vineyard-devoted soils

Effect of organic matter and iron oxides on quaternary herbicide sorption–desorption in vineyard-devoted soils

Solvent extraction followed by ultraviolet detection for investigation of tetramethylthiuram disulfide at soil-water interface

Sorption of Pesticides on Natural Geosorbents

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