3.1. Residues of bentazon and carbofuran
The results of this study indicate that the Ararangua/Mampituba river basin
presented the highest values for bentazon residues in terms of the percentage of
occurrence as well as the mean and maximum concentrations (Table 3).
However, the Itapocu/Putanga and D'Una/Rio Tubarao basins showed a
persistence of residues of~ the herbicide on different crops, with maximum
values ranging from 40.68 to 69.77 mg L1
, but with no clear tendency to increase
over time.
For the insecticide carbofuran, the residues were homogeneously distributed
in all basins (with the exception of the Camboriú river basin), and therefore areas
of greater impact were not apparent.