Data/hora: 04/06/2024 04:21:33

Biblioteca(s): 	Embrapa Florestas.	
Data corrente: 	09/10/2017	
Data da última atualização: 	17/10/2017	
Autoria: 	AGUIAR JUNIOR, T. R.; BORTOLOZO, F. R.; ROSA FILHO, E. F.; PARRON, L. M.; LUZ, L. D.; BRITO, A. G.; FERREIRA, M. T.	
Afiliação: 	Terencio R. Aguiar Junior, Bolsista da Embrapa Florestas; F. R. Bortolozo, University of Lisbon, School of Agronomy, Department of Natural Resources, Environment and Landscape, Portugal; E. F. Rosa Filho, University of Lisbon, School of Agronomy, Department of Natural Resources, Environment and Landscape, Portugal; LUCILIA MARIA PARRON VARGAS, CNPF; L. D. Luz, UFBA; A. G. Brito, University of Lisbon, School of Agronomy, Department of Biosystems Sciences and Engineering, Portugal; M. T. Ferreira, UFPR.	
Título: 	Fate of selected agrochemicals in a tropical karst aquifer: a five-year study.	
Ano de publicação: 	2017	
Fonte/Imprenta: 	Groundwater for Sustainable Development, v. 5, p. 187-192, Sept. 2017.	
DOI: 	http://dx.doi.org/10.1016/j.gsd.2017.06.008	
Idioma: 	Português	
Conteúdo: 	Water contamination by agricultural pollutants is one of the major environmental problems for terrestrial and aquatic life on earth. Recent studies have demonstrated the contamination of karst aquifers by pesticides and agricultural nutrients. However, the predominant research does not adequately address the main destination of these compounds. Also, research is targeted primarily towards Europe and North America. The objective of this study is to assess the fate of selected pesticides along the saturated layers of a karst aquifer, located in a tropical area. During a five-year period, 48 monthly collections were conducted by extracting samples from 24 shallow wells (8?9 m depth) and 24 deep wells (55?60 m depth). A total of 2880 samples were obtained. For all samples physical-chemical and pesticide analyses were performed. We found the presence of atrazine, lambdacyhalothrin, lactofen, fluazifop-p-butyl, chlorpyrifos, nitrate and nitrogen agricultural nutrients. The wells with 8?9 m depth had the highest concentration of the compounds studied in relation to deeper wells at 55?60 m. A significant difference was found regarding the types of pesticide (p<0.05) when comparing shallow and deep wells. Nutrients were also monitored and a decrease in the total nitrogen concentration between the wells with a lower depth (42.9 mg L-1) and the deepest wells (1.2 mg L-1) is observed along the period 2008?2013.	
Palavras-Chave: 	Aquífero; Karst aquifer.	
Thesagro: 	Lençol freático.	
Thesaurus Nal: 	Aquifers; Groundwater contamination; pesticides.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Florestas (CNPF)	
Exemplares: 	CNPF - (55988-1) - UPC - AP - DD -  -  -  - DIS