Aminocyclopyrachlor sorption-desorption and leaching from three Brazilian soils

This study aimed to evaluate the sorption-desorption and leaching of aminocyclopyrachlor from three Brazilian soils. The sorption-desorption of 14 C-aminocyclopyrachlor was evaluated using the batch method and leaching was assessed in glass columns. The Freundlich model showed an adequate fit for th...

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Bibliographic Details
Published in:Journal of environmental science and health. Part B, Pesticides, food contaminants, and agricultural wastes Pesticides, food contaminants, and agricultural wastes, 2017-07, Vol.52 (7), p.470-475
Main Authors: Francisco, Jeane G., Mendes, Kassio F., Pimpinato, Rodrigo F., Tornisielo, Valdemar L., Guimarães, Ana C. D.
Format: Article
Language:English
Subjects:
Adsorption
Aluminum Silicates
Brazil
Clay
Clay soils
Desorption
Herbicide transport
Herbicides
Herbicides - analysis
Herbicides - chemistry
Leaching
pyrimidine carboxylic acid
Pyrimidines - analysis
Pyrimidines - chemistry
retention
Sandy soils
Soil - chemistry
Soil contamination
Soil Pollutants - analysis
Soil Pollutants - chemistry
Soil properties
Soil texture
Soils
Sorption
Texture
tropical soils
Water Pollutants, Chemical - chemistry
Water pollution
Water resources
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Summary:This study aimed to evaluate the sorption-desorption and leaching of aminocyclopyrachlor from three Brazilian soils. The sorption-desorption of 14 C-aminocyclopyrachlor was evaluated using the batch method and leaching was assessed in glass columns. The Freundlich model showed an adequate fit for the sorption-desorption of aminocyclopyrachlor. The Freundlich sorption coefficient [K f (sorption) ] ranged from 0.37 to 1.34 µmol (1-1/n) L 1/n kg −1 and showed a significant positive correlation with the clay content of the soil, while the K f (desorption) ranged from 3.62 to 5.36 µmol (1-1/n) L 1/n kg −1 . The K f (desorption) values were higher than their respective K f (sorption) , indicating that aminocyclopyrachlor sorption is reversible, and the fate of this herbicide in the environment can be affected by leaching. Aminocyclopyrachlor was detected at all depths (0−30 cm) in all the studied soils, where leaching was influenced by soil texture. The total herbicide leaching from the sandy clay and clay soils was
ISSN:0360-1234
1532-4109
DOI:10.1080/03601234.2017.1301758