Monitoramento de agrotóxicos em áreas irrigadas por pivô central na microbacia do Tijunqueiro, município de Morrinhos, Goiás / Pesticides monitoring in irrigated areas by central pivot in the Tijunqueiro Watershed municipality of Morrinhos, Goias

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

12/08/2011

RESUMO

The importance of pesticides to the agricultural system production is indisputable, since they are part of the basics inputs, however, it is essential that they be used properly to be preserved not only the quality of the growing product, but also of their own natural resources, especially soil and water. In this study was conducted the pesticides monitoring used on crops irrigated with a central pivot in the Tijunqueiro watershed municipality of Morrinhos, state of Goias, who had potential for environmental contamination (criteria of the Environmental Protection Agency from the United States EPA, index of GUS - Groundwater Ubiquity Score, GOSS method and Brazilian Institute of Environment and Renewable Natural Resources IBAMA) and sensitive to the mass spectrometer (LC-MS/MS Liquid Chromatography coupled to mass spectrometer) on the period between February 2009 and September 2010, in samples of surface and groundwater, fish and sediment. The active ingredients (pesticides) monitored were acephate, atrazine, azoxistrobin, buprofezin, carbofuran, cyproconazol, chlorpyriphos, difenoconazol, diuron, imidacloprid, malathion, metamidophos, metolachlor, metribuzin, monocrotophos, monuron, thiamethoxan and triazophos. Surface water samples were collected upstream and downstream of the Tijunqueiro dam; groundwater in piezometric wells drilled around the irrigated area; fishes and sediments were collected in the Tijunqueiro dam, The solid phase extraction technique (SPE) was used to extract the analytes from water samples, dispersive solid phase extraction (dSPE) for the sediments samples and QuEChERS (Quick, Easy, Cheap, Effective, Rugged) for the fishes samples. Multiresidue methods used in the study were adequate and efficient for the analysis and quantifications by LC-MS/MS. Was found that all the analytical curves showed correlation coefficients greater than 0,99 and the recoveries were satisfactory (70 % a 120 % of recovery) for most of the active ingredients studied. In the surface water samples, sediments and fish were not detected residues of the active ingredients monitored and 25.7 % groundwater samples showed atrazine contamination

ASSUNTO(S)

agricultura agriculture Água subsuperficial Água superficial contaminação contamination fishes groundwater peixes sedimentos sediments surface water

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