The oxidation degradation effects of tetracycline residues in pharmaceutical wastewater with H_2O_2,HClO_4,and NaClO were compared.The results showed that the effect,pathway,and products of tetracycline degraded by three kinds of oxidants were different.The degradation rate of tetracycline by H_2O_2 was80%,but some of tetracycline was transformed into epitetracycline rather than oxidation degradation.Also,about 88% of tetracycline was degraded by HClO_4,but elimination reaction and conversion into anhydrote...