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On the Interaction Mechanisms of Atrazine and Hydroxyatrazine with Humic Substances

^a Embrapa Instrumentação Agropecuária, C.P. 741, 13560-970 São Carlos (SP), Brazil
^b Centro Universitário Positivo, Av. Nossa Senhora Aparecida, 174, 80440-000 Curitiba (PR), Brazil
^c Ecosystem Sciences, Hilgard Hall #3110, Univ. of California, Berkeley, CA 94720-3110

View larger version (12K): [in a new window]   Fig. 1. Graph showing adsorption envelopes for atrazine (AT; 0.14 mmol L-1) on Oxisol humic acid (HA) and fulvic acid (FA), both at a concentration of 600 mg L-1

View larger version (11K): [in a new window]   Fig. 2. The pH dependence of atrazine solubility in water as detected by UV-visible spectroscopy, monitoring the absorption band at 223 nm. The initial concentration of the saturated aqueous solution of atrazine was 0.28 mmol L-1. Bars indicate standard deviation (SD)