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Comparison of final/initial nitrate (NO3-N) concentrations for sulfamethazine (SM-0.01, -0.1, and -1.0 mg/L) and chlortetracycline (CT-0.01, -0.1, and -1.0 mg/L) after 19 days of incubation. Same letters above each bar indicate no difference between different treatments at a 0.05 significance level of the Tukey's studentized range test.
