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Desenvolveu-se metodo de analise de residuo do herbicida 2,4-D para amostras de agua coletadas na microbacia do Corrego do Espraiado no periodo de 1996 a 1999. A avaliacao da tendencia do produto alcancar camadas mais profundas do solo foi efetuada por simulacao de sistemas (CMLS-94-Chemical Movement in Layered Soils) para melhor entendimento do comportamento do herbicida. O metodo analitico, utilizando cromatografia a gas, permitiu correlacao de 99,9% entre a area dos picos e a concentracao existente, indicando alta eficiencia. Nao foi encontrado residuo de 2,4-D na agua coletada nos anos de 1996 a 1999, o que tambem reforca os dados encontrados por simulacao. Esses indicaram que 60 cm foi a profundidade maxima atingida no periodo de tres anos, tanto para o Latossolo Roxo quanto para o Latossolo Vermelho Escuro. O mesmo estudo evidenciou que a partir do segundo ano apos a aplicacao ja nao havia mais residuos do produto em ambos os solos estudados. ANALYTICAL METHODOLOGY OF 2,4-D (2,4-DICHLOROPHENOXYACETIC ACID) HERBICIDE RESIDUES IN SAMPLES OF WATER IN A SUGAR-CANE CULTIVATION AREA IN BRAZIL Abstract A method of analysis of the herbicide 2,4-D was developed for water samples collected in the Espraiado watershed in the period of 1996 and 1999. The evaluation of the tendency of the product to reach deeper layers of the soil was made by systems simulation (CMLS-94-Chemical Movement in Layered Soils) for better understanding of the herbicide behavior. The gas chromatography analytical method resulted in a 99.9% correlation of the peaks area in the graphics and the herbicide concentration, and indicated that it was highly effective. No residue of 2,4-D was detected in water in the years of 1996 to 1999, which also reinforce the data obtained by simulation. This indicated the leaching down to 60 cm., reached in a three-year period, in both types of soils, Latossolo Roxo and Latossolo Vermelho-Escuro The same study evidenced that from the second year after application there were no more product residues in both types of the soils studied.

METODOLOGIA ANALÍTICA DE RESÍDUO DO HERBICIDA 2,4-D (ÁCIDO 2,4-DICLOROFENOXIACÉTICO) EM AMOSTRAS DE ÁGUA EM ÁREA DE CULTIVO DE CANA-DE-AÇÚCAR