s Degradation of atrazine was investigated in UV, UV/H 2 O 2 , UV/ HSO 5 À and UV/S 2 O 8 2À AOPs. UV/S 2 O 8 2À process was found to be more efficient as well as more economical. The pH affected UV/S 2 O 8 2À but had no significant influence on UV, UV/H 2 O 2 and UV/HSO 5 À . Second order rate constants of atrazine with SO 4 ÅÀ and Å OH were found to be comparable. Degradation mechanism was investigated by GC-MS and LC-MS/ MS analysis.
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