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| Concentration and distribution of tetracycline antibiotics in soils from vegetable fields of dongguan City |
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Abstract The concentration and distribution of four tetracycline antibiotics (TCs) including tetracycline(TC), oxytetracycline (OTC), chlortetracycline (CTC) and deoxytetracycline (DC) in soils from 24 typical vegetable fields in 18 towns of Dongguan city using high-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) was discussed. The total concentrations of four tetracycline antibiotics (∑TCs) ranged from 0 (below LOQ) to 97.04μg/kg, which predominated with under 10μg/kg and averaged at 13.42μg/kg. The concentrations of four tetracycline compounds detected in 59~89% of the samples ranged from 0 (below LOQ) to 75.29μg/kg which falls mostly bellow 10μg/kg. Oxytetracycline which averaged at 6.51μg/kg was dominant compound, followed by chlortetracycline and deoxytetracycline which averaged at 2.95μg/kg and 2.92μg/kg respectively. The concentration and constitute of tetracycline compounds in soils from different vegetable fields varied greatly, consisting mainly of four models, i.e. the first one dominated with oxytetracycline, the second one dominated with chlortetracycline, the third one dominated with deoxytetracycline, and the last one dominated with both oxytetracycline and deoxytetracycline. However, the concentrations and constitute of tetracycline compounds in soils grown different cultivars within the same vegetable fields varied weakly. The concentrations of tetracycline antibiotics in soils from vegetable fields of Dongguan city were generally lower and less ecotoxic risk for soil ecosystem. But it should not be ignored as to combined toxic effect and resistance of various compounds.
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Received: 02 June 2010
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