Acetamiprid, carbendazim, diuron and thiamethoxam sorption in two Brazilian tropical soils.

Sorption of acetamiprid (E)-N1-[(6-chloro-3-pyridyl)methyl]-N2-cyano-N1-methylacetamidine), carbendazim (methyl benzimidazol-2-ylcarbamate), diuron (N-(3,4-dichlorophenyl)-N, N-dimethyl urea) and thiamethoxam (3-(2-chloro-thiazol-5-ylmethyl)-5-methyl-[1,3,5]oxadiazinan-4-ylidene-N-nitroamine) was evaluated in two Brazilian tropical soils, Oxisol and Entisol, from Primavera do Leste region, Mato Grosso State, Brazil. To describe the sorption process, batch experiments were carried out. Linear and Freundlich isotherm models were used to calculate the Kd and Kf coefficients from experimental data. The Kd values were utilized to calculate the partition coefficient normalized to soil organic carbon (Koc). For the pesticides acetamiprid, carbendazim, diuron and thiamenthoxan the Koc (mL g- 1) values ranged in both soils from 98 - 3235, 1024 - 2644, 145 - 2631 and 104 - 2877, respectively. From the studied pesticides, only carbendazim presented correlation (r2 = 0.82 and p < 0.01) with soil organic carbon (OC) content. Acetamiprid and thiamethoxam showed low sorption coefficients, representing a high risk of surface and ground water contamination.

Bibliographic Details

Main Authors:	CARBO, L., MARTINS, E. L., DORES, E. F. G. C., SPADOTTO, C. A., WEBER, O. L. S., DE-LAMONICA-FREIRE, E. M.
Other Authors:	Leandro Carbo, LARB-UFMT; Eucarlos de Lima Martins, Laboratório de Análises de Resíduos de Biocidas-UFMT; Eliana F. G. C. Dores, LARB-UFMT; Cláudio Aparecido Spadotto, Embrapa Meio Ambiente; Oscarlina Lúcia dos Santos Weber, FAMEV-UFMT; Ermelinda M. De-Lamonica-Freire, UNIVAG.
Format:	Separatas biblioteca
Language:	English eng
Published:	2008-01-14
Subjects:	Contaminação do solo, Brasil, Mato Grosso., Agrotóxico, Poluição da Água, Solo Tropical, Sorção.,
Online Access:	http://www.alice.cnptia.embrapa.br/alice/handle/doc/15970
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