Sorption and degradation of atrazine in soil organic matter fractions - Traghetta, D G; Sposito, G; Vieira, Eny Maria; Machado, Sergio Antonio Spinola; Mazo, Luiz Henrique; Avaca, Luís Alberto; Vaz, C M P; Crestana, Silvio; Martin Neto, L (Conference on Environmetrics in Brazil, 1996)