INFLUENCE OF HUMIC ACIDS AND OXIDES (Fe_2O_3 AND TiO_2) ON TRIBENURON-METHYL HERBICIDE PHOTOLYSIS IN WATER

摘要

The photolysis of Tribenuron-methyl (TRB) was studied in the presence of humic acids (HA) and oxides. Samples were irradiated in polychromatic light using a Heraeus apparatus equipped with Xenon lamp and with low pressure mercury lamp (Philips 16w). The concentration of remaining herbicide was followed using a high pressure liquid chromatograph (HPLC) equipped with UV detector at 235 nm. The presence of HA and Fe_2O_3 induced a decrease of the photodegradation of the pesticide with respect to the pure water solution. However, in the presence of titanium dioxide, the degradation of TRB was fast.