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The occurrence and distribution of five selected fluoroquinolones (FQs) were studied in the Dongjiang River and the Beijiang River, South China. Ciprofloxacin, norfloxacin and enoxacin, used as human and veterinary medicines, were detected with detection frequencies of 75%–100% and average concentrations of 9.5–18.8 ng L−1 in the two rivers. Meanwhile, enrofloxacin, which is only used as veterinary...
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