DISTRIBUTION OF METALS IN CABE A RIVER WATERS, TRIBUTARY AT THE CORUMBATAí RIVER BASIN, SP = DISTRIBUI O DE METAIS NAS áGUAS DO RIO CABE A, TRIBUTáRIO NA BACIA DO RIO CORUMBATAí, SP

Water samples were collected with monthly frequency from April 2007 to March 2009 at five sampling points in the Cabe a River and two points in Passa Cinco River, both tributaries at the Corumbataí River Basin, SP, and the distribution of metals Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb , Zn, Ca and Mg was evaluate. These elements were quantified by atomic emission spectrometry and the results were analyzed by multivariate statistical technique (principal component analysis), relating the values with the dry and rainy seasons. The metals Cr, Cu and Ni were not detected and Cd and Pb were detected in 8.3% and 10.1% of the samples, respectively, and the values were above those permitted by CONAMA Resolution 357/2005 for Class 2 Rivers. The values of Fe and 36.9% of the values for the Al also exceeded the limit established by legislation. These two metals are strongly influenced by soil characteristics of the studied area. Zn concentrations were below the limit from standard from CONAMA Resolution, but the presence of this element can be related to the lack of riparian vegetation and intense agricultural occupation, especially with sugar cane. Only six samples have values above the limit established by legislation. The highest values of Ca were observed in the rainy season in sampling points located in areas of exploitation of lime and sugar cane cultivation in which liming is frequent. = Amostras de água foram coletadas, com frequência mensal no período de abril de 2007 a mar o de 2009, em cinco pontos de amostragem no rio Cabe a e dois pontos no rio Passa Cinco, ambos tributários na bacia do rio Corumbataí, SP, para avaliar a distribui o dos metais Al, Cd, Cr, Cu, Fe, Mn, Ni, Pb, Zn, Ca e Mg. Esses elementos foram quantificados por meio de espectrometria de emiss o at mica e os resultados foram analisados pela técnica estatística multivariada (análise de componentes principais), relacionando os valores com os períodos seco e chuvoso. Os metais Cr, Cu e Ni n o foram detectados e o Cd e o Pb foram detectados em 8,3% e 10,1% das amostras, respectivamente, e os valores estavam acima do permitido pela Resolu o CONAMA 357/2005 para rios de classe 2. Também estavam em desacordo com essa legisla o os valores de Fe e 36,9% dos valores encontrados para o Al. Esses dois metais s o fortemente influenciados pelas características pedológicas da área estudada. As concentra es de Zn n o extrapolaram os limites, mas a presen a desse elemento pode estar relacionada com a falta de matas ciliares e intensa ocupa o agrícola, principalmente com a cultura canavieira. O Mn teve seus