中文摘要：

抗生素作为新兴环境污染物在区域农业土壤污染特征研究中鲜见报道.本文利用固相萃取-高效液相色谱-串联质谱分析方法,调查了东莞市18个区镇24个代表性蔬菜基地土壤中喹诺酮类抗生素（QNs）的含量与分布特征.结果表明,4种喹诺酮类化合物的检出率均在90%以上,以环丙沙星（平均含量24.93μg·kg^-1）和恩诺沙星（平均含量19.85μg·kg^-1）为主,总含量（∑QNs）为0～554.1μg·kg^-1,主要在10～50μg·kg^-1之间,平均为50.23μg·kg^-1.不同基地土壤中喹诺酮类化合物的含量和组成特征有明显差异,主要包括恩诺沙星和环丙沙星两个化合物为主、环丙沙星单个化合物为主、诺氟沙星和环丙沙星两个化合物为主和洛美沙星单个化合物为主4种组成模式.相同蔬菜基地不同土壤样品之间化合物的含量总体上差异不大,但不同蔬菜品种或基因型土壤中化合物的含量及组成特征有一定差异.研究结果显示,东莞市蔬菜基地土壤中喹诺酮类抗生素含量普遍较低,但部分含量超过了抗生素生态毒害效应触发值（100μg·kg^-1）.

英文摘要：

Although they are an emerging class of pollutants,antibiotics in regional agricultural soils are rarely studied.We investigated the concentration and distribution of four quinolone antibiotics（QNs） in the soils from 24 typical vegetable fields in 18 towns of Dongguan city using high-performance liquid chromatography-tandem mass spectrometry （HPLC-MS/MS）.The results showed that there were very high detection rates （above 90%） observed for four compounds,dominated by ciprofloxacin （CIP,average concentration of 24.93μg·kg-1） and enrofloxacin （ENR,average concentration of 19.85μg·kg-1）.The total concentrations of the four compounds ranged from 0 （below LOQ） to 554.1μg·kg-1 and focused between 10 and 50μg·kg-1,with an average of 50.23μg·kg-1.The concentration and constituents of the quinolone compounds in the soils from different vegetable fields were various,consisting mainly of four models,i.e.the first model dominated by both ENR and CIP,the second model dominated by CIP alone,the third model dominated with both NOR and CIP,and the last model dominated with single LOM.However,the concentrations of QNs in different soil samples from the same vegetable fields were in general comparative.While the concentration and constitute of quinolone compounds in soils grown different variety or genotype of vegetable varied to some extent.It is therefore concluded that the concentrations of quinolone antibiotics in soils from vegetable fields of Dongguan city were generally lower,But some of them were above the trigger value of ecological risk（100μg·kg-1）.