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Influence of Humic acids and oxides (Fe2O3 and TiO2) on Tribenuron‐methyl herbicide photolysis in water

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 16 w). 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 Fe2O3 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.