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Alkaline phosphatase (PHOS-OH) activity in control soil and soil treated with diclofenac (A), naproxen (B), ibuprofen (C), and ketoprofen (D) at concentrations of 1 and 10 mg/kg soil during the 90-day experiment. The data presented are the means and standard deviations of three replicates and are expressed as μg p-NP/g soil/h. Different letters (within each drug) indicate significant differences (P < 0.005, LSD test) related to the effects of concentration and time.
