Data/hora: 21/06/2024 05:53:18

Biblioteca(s): 	Embrapa Meio Ambiente; Embrapa Solos.	
Data corrente: 	18/05/2004	
Data da última atualização: 	20/09/2017	
Autoria: 	PARAIBA, L. C.; CERDEIRA, A. L.; SILVA, E. F. da; MARTINS, J. S.; COUTINHO, H. L. da C.	
Afiliação: 	LOURIVAL COSTA PARAIBA, CNPMA; ANTONIO LUIZ CERDEIRA, CNPMA; ENIO FRAGA DA SILVA, CNPS; Embrapa Solos; HEITOR LUIZ DA COSTA COUTINHO, CNPS.	
Título: 	Evaluation of soil temperature effect on herbicide leaching potential into groundwater in the brazilian cerrado.	
Ano de publicação: 	2003	
Fonte/Imprenta: 	Chemosphere, Oxford, v. 53, p. 1087-1095, 2003.	
Idioma: 	Inglês	
Conteúdo: 	The effect of annual variations in the daily average soil temperatures, at different depths, on the calculation of pesticide leaching potential indices is presented. This index can be applied to assess the risk of groundwater contamination by a pesticide. It considers the effects of water table depth, daily recharge net rate, pesticide sorption coefficient, and degradation rate of the pesticide in the soil. The leaching potential index is frequently used as a screening indicator in pesticide groundwater contamination studies, and the temperature effect involved in its calculation is usually not considered. It is well known that soil temperature affects pesticide degradation rates, air-water partition coefficient, and water-soil partition coefficient. These three parameters are components of the attenuation and retardation factors, as well as the leaching potential index, and contribute to determine pesticide behavior in the environment. The Arrhenius, van't Hoff, and Clausius-Clapeyron equations were used in this work to estimate the soil temperature effect on pesticide degradation rate, air-water partition coefficient, and water--soil partition coefficient, respectively. The relationship between leaching potential index and soil temperature at different depths is presented and aids in the understanding of how potential pesticide groundwater contamination varies on different climatic conditions. Numerical results will be presented for 31 herbicides known to be used in corn and soybean crops grown on the municipality of São Gabriel do Oeste, Mato Grosso do Sul State, Brazil.	
Palavras-Chave: 	Água subterrânea; Índice.	
Thesagro: 	Agrotóxico; Cerrado; Contaminação; Herbicida; Impacto ambiental; Lixiviação; Pesticida; Solo; Temperatura; Temperatura do Solo.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra
X Pesquisa, Tecnologia e Engenharia	
URL: 	http://ainfo.cnptia.embrapa.br/digital/bitstream/item/163813/1/Paraiba-Evaluation-6433.pdf	
Registro original: 	Embrapa Meio Ambiente (CNPMA)	
Exemplares: 	CNPMA - (6433-1) - UPC - AP - DD -  -  - 2006.00016 - DIS
CNPS - (11368-1) - UPC - AP - DD -  -  - 2004.00006 - DIS