Adsorption of Organic Chemicals in Soils

Calvet, Raoul

doi:10.2307/3430653

Cited by 71 publications

(79 citation statements)

References 99 publications

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“…Sorption of 2,4-D by soil is largely the result of weak hydrogen bonds and van der Waals interactions with soil organic matter (Calvet 1989;Senesi 1992). Other soil properties, including pH and clay content, are also known to affect 2,4-D sorption (Reddy and Gambrell 1987;Green and Karickhoff 1990).…”

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confidence: 99%

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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Gaultier, J., Farenhorst, A. and Crow, G. 2006. Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth. Can. J. Soil Sci. 86: 89-95. Since pesticide fate and leaching models increasingly incorporate spatial variability, the objective of this study was to quantify the variability of soil properties and 2,4-D sorption within a hummocky field as affected by landscape position and soil depth. Seventy-two soil cores collected at 5-m intervals along a transect were segmented by soil horizon (A, B and C) and landscape position (upper, mid, lower and depression). As expected, soil organic carbon content significantly decreased, and soil pH and soil carbonate content significantly increased with soil depth, while clay content was significantly greater in the B horizon than the A and C horizon. Soils from the depressional area generally had higher soil organic carbon content, soil carbonate content, clay content and soil pH than soil samples from other slope positions. The sorption of 2,4-D by soil was positively correlated with soil organic matter content and negatively correlated with soil carbonate content. These soil properties and herbicide sorption varied along the transect and with soil depth. Regardless of whether or not the landscape was segmented by landscape position, for both the A and C horizon, predictions of 2,4-D sorption by soil were generally good using simple regression models that contained soil organic carbon content and carbonate content as the only parameters. However, for the B horizon, the prediction of 2,4-D sorption by soil was very poor when all sampling points along the transect were considered, but greatly improved for the mid-and depressional slope positions when soils were segmented by landscape position. We conclude that segmentation by slope position could be a useful additional tool when predicting pesticide fate and leaching at the large-scale. As well, the negative association between soil carbonate content and 2,4-D sorption warrants further attention as a large portion of Canadian agriculture encompasses calcareous soils. . Comme il fallait s'y attendre, la teneur en carbone organique diminue significativement alors que le pH et la concentration de carbonates augmentent significativement avec la profondeur; parallèlement, il y a sensiblement plus d'argile dans l'horizon B que dans les horizons A et C. Le sol des dépressions contient généralement plus de carbone organique, de carbonates et d'argile que le sol prélevé ailleurs sur la pente et son pH est plus élevé. La sorption du 2,4-D par le sol présente une corrélation positive avec la concentration de matière organique et une autre, négative, avec la concentration de carbonates. Ces propriétés du sol et la sorption de l'herbicide varient avec l'emplacement le long du transect et la profondeur. Les modèles à régression simple n'ayant pour seuls paramètres que la concentration de carbone organique et de carbonates prévoient généralement bien la sorption du 2,4-D p...

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confidence: 99%

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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“…Effect of soil properties on adsorption The key soil properties considered to have the most influence on adsorption of solutes are soil organic matter content and the nature and quantity of clay mineral content (Calvet 1989;Barriuso et al 1992). Other soil properties that can influence adsorption characteristics, especially in the subsoils, are pH and the content of Fe and Al oxides (Nicholls 1988;Baskaran et al 1996).…”

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confidence: 99%

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Magesan

Bolan

Lee

2003

New Zealand Journal of Agricultural Research

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Quantification of soil processes, such as adsorption, is needed for predicting the fate of agricultural chemicals in soils. Adsorption is affected by soil properties, which vary with depth. We conducted a laboratory study to determine the influence of soil depth on the adsorption of an organic solute (atrazine) in both allophanic and non-allophanic soils, and an inorganic solute (phosphate) in two non-allophanic soils. Adsorption isotherms of atrazine and phosphate were determined using 14 C-labelled atrazine and KH 2 PO 4 , respectively, in batch equilibrium. The adsorption isotherms for atrazine were almost linear, and adequately described by the Freundlich equation. For phosphate the adsorption isotherms exhibited substantially more curvature and were best described by the Langmuir equation for one of the soils. Generally, adsorption of both solutes decreased with depth. While atrazine adsorption appeared related to such factors as percentage clay content, total C, cation exchange capacity (CEC), and surface area, no similar relationships appeared apparent for phosphate adsorption.

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“…Isotherms show that spinosad adsorption on the three sorbent increases with increasing the initial concentration within the tested range. The adsorption patterns represent the S-type where adsorption becomes easier as the concentration in the liquid phase increases (Calvet, 1989;Delle, 2001). Clay fraction shows more affinity to adsorb spinosad than HA fraction.…”

Section: Spinosad Adsorption Isothermsmentioning

confidence: 99%

Spinosad Adsorption on Humic and Clay Constituents of Lacustrine Egyptian Soils and Its Leaching Potential

2016

Alexandria Science Exchange Journal: An International Quarterly

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Adsorption of Organic Chemicals in Soils

Cited by 71 publications

References 99 publications

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Adsorption of atrazine and phosphate as affected by soil depth in allophanic and non‐allophanic soils

Spinosad Adsorption on Humic and Clay Constituents of Lacustrine Egyptian Soils and Its Leaching Potential

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