AVALIAÇÃO TEMPORAL E ESPACIAL NO CÓRREGO DO CINTRA (BOTUCATU-SP) FRENTE AOS DEFENSIVOS AGRÍCOLAS E PARÂMETROS FÍSICO-QUÍMICOS DE QUA-LIDADE DA ÁGUA – UM ESTUDO DE CASO

Os objetivos do presente estudo foram: avaliar os impactos provocados pela descarga de efluente tratado pela Estacao de Tratamento de Esgoto – ETE (SABESP) em Botucatu – SP, no Corrego do Cintra (P 2 ), detectando qualitativa e quantitativamente as possiveis fontes de contaminacao pontual e difusa; propor medidas de conservacao do solo nas suas varias aplicacoes e relaciona-los aos riscos a saude humana e ao meio ambiente. As coletas de amostras de agua foram bimensais durante os meses de Junho/2005 e Maio/2006, as quais, foram analisadas para determinacao de parâmetros fisico-quimicos (pH e condutividade eletrica-CE) e defensivos agricolas (carbamatos, piretroides, fosforados, clorados).  O valor da CE no P 2 foi acima de 100 m S .cm -1 , o pH proximo da neutralidade no P 1 e P 2 , alcalino no P 4 a P 7 , condicoes essas indicativas de ambiente impactado. Entre os defensivos agricolas, os Piretroides foram encontrados com concentracoes na ordem de 5,5 vezes o indice maximo permitido pela Portaria do Ministerio da Saude (MS) em aguas para consumo humano e a presenca de clorados em varias coletas nos pontos 2, 4 e 8. Propostas de remediacao ambiental com mecanismos corretivos nos principais focos geradores de poluicao (P 1 e P 2 ) devem ser viabilizados, tais como: recomposicao da mata ciliar em areas agricolas e de pastagens, alem da utilizacao de sistemas conservacionistas, como medidas para mitigar o escoamento de defensivos agricolas e restabelecer a qualidade de agua no Corrego do Cintra, para a dessedentacao de animais e recreacao nas cachoeiras (P 8 ) sem causar danos a saude dos frequentadores. Palavras-chave : Microbacia, areas agricolas, antropogenico, mata ciliar, conservacao do solo TEMPORAL AND SPATIAL EVALUATION OF CINTRA STREAM (BOTUCATU, SAO PAULO STATE, BRAZIL) RELATIVE TO PESTICIDES AND PHYSICOCHEMICAL PARAMETERS OF WATER QUALITY – A CASE STUDY SUMMARY: The objectives of this study were to evaluate the impacts caused by the discharge of effluent treated by the Wastewater Treatment Plant (WTP) - SABESP in Botucatu-SP at Cintra Stream (S 2 ); qualitatively and quantitatively detect the possible local and diffuse contamination sources in Cintra Stream; and suggest soil conservation measures and their several applications correlated to environmental and human health risks. Samplings were done every two months from June/2005 to May/2006, which were analyzed for the determination of data on physicochemical parameters (pH and electrical conductivity – EC) and pesticides (carbamates, pyrethroids, phosphorates, chlorates). EC value was higher than 100 m S/cm at S 2 , and pH was close to normality at S 1 and S 2 and alkaline from S 4 to S 7 − conditions indicative of impacted environment. Among pesticides, pyrethroids were detected at concentrations of approximately 5.5-fold higher than the maximum index allowed by the Edict of the Ministry of Health (MH) in waters for human consumption, and chlorines were detected in several samplings at S 2 , S 4 , and S 8 . Proposals for environmental remediation using corrective mechanisms at the main pollution sources (S 1 and S 2 ), including restoration of riparian forest in agricultural and pasture areas in addition to the  use of conservational systems, can mitigate pesticide flow and reestablish water quality in Cintra Stream for animal consumption and recreation in waterfalls (S 8 ) with no harm to the health of users. Keywords: Microwatershed, agricultural areas, anthropic activity, riparian forest, soil conservation.