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Sorption, desorption and leaching potential of sulfonylurea herbicides in Argentinean soils.
J Environ Sci Health B. 2015; 50(4):229-37.JE

Abstract

The sulfonylurea (SUs) herbicides are used to control broadleaf weeds and some grasses in a variety of crops. They have become popular because of their low application rates, low mammalian toxicity and an outstanding herbicidal activity. Sorption is a major process influencing the fate of pesticides in soil. The objective of this study was to characterize sorption-desorption of four sulfonylurea herbicides: metsulfuron-methyl (methyl 2-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoylsulfamoyl)]benzoate), sulfometuron-methyl (methyl 2-[(4,6-dimethylpyrimidin-2-yl)carbamoylsulfamoyl]benzoate), rimsulfuron (1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-ethylsulfonyl-2-pyridylsulfonyl)urea) and nicosulfuron (2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoyl]-N,N-dimethylnicotinamide) from different soil horizons of different landscape positions. Sorption was studied in the laboratory by batch equilibration method. Sorption coefficients (K(d-SE)) showed that rimsulfuron (K(d-SE) = 1.18 to 2.08 L kg(-1)) and nicosulfuron (K(d-SE) = 0.02 to 0.47 L kg(-1)) were more highly sorbed than metsulfuron-methyl (K(d-SE) = 0.00 to 0.05 L kg(-1)) and sulfometuron-methyl (K(d-SE) = 0.00 to 0.05 L kg(-1)). Sorption coefficients (K(d-SE)) were correlated with pH and organic carbon content. All four herbicides exhibited desorption hysteresis where the desorption coefficients (K(d-D)) > K(d-SE). To estimate the leaching potential, K(oc) and ground-water ubiquity score (GUS) were used to calculate the half-life (t1/2) required to be classified as "leacher" or "nonleacher". According to the results, rimsulfuron and nicosulfuron herbicides would be classified as leachers, but factors such as landscape position, soil depth and the rate of decomposition in surface and subsurface soils could change the classification. In contrast, these factors do not affect classification of sulfometuron-methyl and metsulfuron-methyl; they would rank as leachers.

Authors+Show Affiliations

a National Institute of Agricultural Technology (INTA), Anguil Agricultural Experiment Station , Anguil , La Pampa , Argentina.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

25714454

Citation

Azcarate, Mariela P., et al. "Sorption, Desorption and Leaching Potential of Sulfonylurea Herbicides in Argentinean Soils." Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes, vol. 50, no. 4, 2015, pp. 229-37.
Azcarate MP, Montoya JC, Koskinen WC. Sorption, desorption and leaching potential of sulfonylurea herbicides in Argentinean soils. J Environ Sci Health B. 2015;50(4):229-37.
Azcarate, M. P., Montoya, J. C., & Koskinen, W. C. (2015). Sorption, desorption and leaching potential of sulfonylurea herbicides in Argentinean soils. Journal of Environmental Science and Health. Part. B, Pesticides, Food Contaminants, and Agricultural Wastes, 50(4), 229-37. https://doi.org/10.1080/03601234.2015.999583
Azcarate MP, Montoya JC, Koskinen WC. Sorption, Desorption and Leaching Potential of Sulfonylurea Herbicides in Argentinean Soils. J Environ Sci Health B. 2015;50(4):229-37. PubMed PMID: 25714454.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sorption, desorption and leaching potential of sulfonylurea herbicides in Argentinean soils. AU - Azcarate,Mariela P, AU - Montoya,Jorgelina C, AU - Koskinen,William C, PY - 2015/2/26/entrez PY - 2015/2/26/pubmed PY - 2015/11/3/medline KW - Argentinean soils KW - Sorption KW - hysteresis KW - leaching potential KW - sulfonylurea herbicides SP - 229 EP - 37 JF - Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes JO - J Environ Sci Health B VL - 50 IS - 4 N2 - The sulfonylurea (SUs) herbicides are used to control broadleaf weeds and some grasses in a variety of crops. They have become popular because of their low application rates, low mammalian toxicity and an outstanding herbicidal activity. Sorption is a major process influencing the fate of pesticides in soil. The objective of this study was to characterize sorption-desorption of four sulfonylurea herbicides: metsulfuron-methyl (methyl 2-[(4-methoxy-6-methyl-1,3,5-triazin-2-yl)carbamoylsulfamoyl)]benzoate), sulfometuron-methyl (methyl 2-[(4,6-dimethylpyrimidin-2-yl)carbamoylsulfamoyl]benzoate), rimsulfuron (1-(4,6-dimethoxypyrimidin-2-yl)-3-(3-ethylsulfonyl-2-pyridylsulfonyl)urea) and nicosulfuron (2-[(4,6-dimethoxypyrimidin-2-yl)carbamoylsulfamoyl]-N,N-dimethylnicotinamide) from different soil horizons of different landscape positions. Sorption was studied in the laboratory by batch equilibration method. Sorption coefficients (K(d-SE)) showed that rimsulfuron (K(d-SE) = 1.18 to 2.08 L kg(-1)) and nicosulfuron (K(d-SE) = 0.02 to 0.47 L kg(-1)) were more highly sorbed than metsulfuron-methyl (K(d-SE) = 0.00 to 0.05 L kg(-1)) and sulfometuron-methyl (K(d-SE) = 0.00 to 0.05 L kg(-1)). Sorption coefficients (K(d-SE)) were correlated with pH and organic carbon content. All four herbicides exhibited desorption hysteresis where the desorption coefficients (K(d-D)) > K(d-SE). To estimate the leaching potential, K(oc) and ground-water ubiquity score (GUS) were used to calculate the half-life (t1/2) required to be classified as "leacher" or "nonleacher". According to the results, rimsulfuron and nicosulfuron herbicides would be classified as leachers, but factors such as landscape position, soil depth and the rate of decomposition in surface and subsurface soils could change the classification. In contrast, these factors do not affect classification of sulfometuron-methyl and metsulfuron-methyl; they would rank as leachers. SN - 1532-4109 UR - https://www.unboundmedicine.com/medline/citation/25714454/Sorption_desorption_and_leaching_potential_of_sulfonylurea_herbicides_in_Argentinean_soils_ L2 - https://www.tandfonline.com/doi/full/10.1080/03601234.2015.999583 DB - PRIME DP - Unbound Medicine ER -