Abstract

PEIXOTO, Maria de Fátima da Silva Pinto et al. Remobilization of ¹⁴C-atrazine bound residues in fulvic acids. Cienc. Rural [online]. 2005, vol.35, n.2, pp. 340-346. ISSN 0103-8478.  http://dx.doi.org/10.1590/S0103-84782005000200014.

The experiment was carried out under laboratory conditions in order to know the remobilization of ¹⁴C-atrazine bound residues in two soils from São Paulo State. Hapludox and Umbraquults soils were incubated for 49 days with ¹⁴C-atrazine in special flasks. The ¹⁴CO₂ evolution was measured according to COSTA (1992). The extraction by solvent and organic matter fractionation were made following LAVORENTI et al. (1997). The extracts obtained were analyzed for their radioactivity and RF values of TLC. The atrazine mineralization from the Umbraquults soil was of minor importance for its detoxification. The hidroxiatrazine was the main metabolite of the atrazine found in both soils. The greatest percentage of atrazine bound residues was found in the humine and fulvic acid fractions, followed by humic acids.

Keywords : atrazine; remobilization; fulvic acids; bound residues.