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| Residues and risk assessment of tetracycline antibiotics in vegetable-growing soils from suburban areas of northern Guangzhou |
| Received:April 12, 2017 |
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| KeyWord:antibiotic;soil pollution;suburban district of north Guangzhou City;vegetable production farms;risk assessment |
| Author Name | Affiliation | E-mail | | ZHU Xiu-hui | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | ZENG Qiao-yun | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | qiaoyunzeng@126.com | | XIE Qi-lai | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | DING dan | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | | | RU Shu-ling | College of Natural Resources and Environment, South China Agricultural University, Guangzhou 510642, China | |
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| Abstract: |
| From 20 different vegetable-growing farms in suburban areas of northern Guangzhou city, 30 soil samples were collected.They were analyzed for the contents of three different tetracycline-based antibiotics:tetracycline(TC), oxytetracycline(OTC), and chlorotetracycline(CTC), using a solid phase extraction(SPE) method and high performance liquid chromatography-tandem mass spectrometry(HPLC-MS/MS). The results showed that the concentrations ranged between ND~30.37(mean:5.64), ND~903.13(mean:38.39), and ND~103.02(mean:8.92) μg·kg-1 for TC, OTC, and CTC, respectively. Source analysis using an analytic hierarchy procedure indicated that manure used for growing vegetables was the principle source, accounting for more than 50% of the three antibiotics, whereas commercial organic fertilizers were the secondary source, accounting for 24%. Risk assessment using a combined approach of risk quotients and Kriging showed that the three antibiotics have low risks, with a few hotspots located in the western part of the studied area, where OTC possessed the highest risk, followed by CTC. |
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