【摘要】 为了解蔬菜基地土壤中四环素类抗生素的残留及风险状况,采集了广州市北郊20个蔬菜基地30个土壤样品,利用固相萃取（SPE）-高效液相色谱-串联质谱（HPLC-MS/MS）分析方法,检测土壤中四环素类抗生素（四环素、土霉素和金霉素）的残留状况,并引入层次分析法、风险商值法和指示克里金法,分析研究区域土壤抗生素的主要来源、生态风险以及空间分布。结果表明,广州市北郊蔬菜基地土壤四环素（Tetracycline,TC）、土霉素（Oxytetracycline,OTC）和金霉素（Chlorotetracycline,CTC）的含量范围分别为ND³0.37μg·kg^-1、ND⁹03.13μg·kg^-1和ND¹03.02μg·kg^-1,其平均值分别为5.64、38.39μg·kg^-1和8.92μg·kg^-1,3种TCs在土壤中的平均含量高低顺序为:OTC>CTC>TC。粪肥是土壤3种TCs的主要来源,其贡献率大于50%;其次是商业性有机肥,其权重系数为24%左右。广州市北郊蔬菜基地土壤中3种TCs的生态风险整体较低,但西部部分区域处于中、高风险等级,首要防控污染物为OTC,其次是CTC。更多还原

【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（HPLCMS/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.更多还原