Aqueous uv radiation and uv/h2o2 oxidation of atrazine first degradation products: Deethylatrazine and deisopropylatrazine

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Abstract
The UV photolysis and H2O2/UV advanced oxidation of two intermediate compounds of the degradation of atrazine in water, deethylatrazine and deisopropylatrazine, have been studied. The influence of hydrogen peroxide and bicarbonate ion concentrations was observed both in organic‐free water and in surface waters. Both UV photolysis and UV/H2O2 oxidation techniques lead to significant rates of elimination of these compounds, although they were lower in surface waters, likely due to the presence of natural radical scavengers. However, in the presence of 0.01 M bicarbonate ion, degradation rates were similar regardless of the type of water used. A kinetic study of both techniques was also conducted. Quantum yields and rate constants of the reaction between the hydroxyl radical and both intermediates were determined.