中文摘要 采集银川市农田表层土壤样品共43个，采用高效液相色谱法检测了土霉素（OTC）、四环素（TC）、金霉素（CTC）和强力霉素（DOC）的含量，结合空间克里金插值方法，分析了银川市农田土壤中这4种四环素类抗生素（TCs）的污染特征及空间分布状况，采用风险商值法评价了农田土壤中OTC、TC、CTC和DOC的生态风险.结果表明，四环素类抗生素在所有土壤样品中均有检出，土壤中ΣTCs含量在40.68~1074.42 μg·kg-1之间，平均值为462.24 μg·kg-1，在ΣTCs中平均占比为：CTC（69.26%） > OTC（16.34%） > TC（12.86%） > DOC（1.54%），CTC为主要污染物；在空间分布上OTC、CTC和DOC这3种抗生素的浓度呈现中部高四周低的趋势，而TC则在西北部浓度最高；在不同种植类型土壤中ΣTCs的平均含量为：设施菜地（596.01 μg·kg-1） > 牧草地（487.04 μg·kg-1） > 耕地（437.52 μg·kg-1） > 园地（404.99 μg·kg-1）；生态风险评价结果显示，农田土壤中OTC、TC、CTC和DOC的风险平均值分别为0.14、0.69、0.14和1.02，其中23.26%样品的TC与6.98%样品的DOC处于高风险水平，应当引起重视. 英文摘要 A total of 43 surface soil samples were collected from Yinchuan farmland and high performance liquid chromatography(HPLC) was used to measure the concentrations of oxytetracycline(OTC), tetracycline(TC), chlortetracycline(CTC), and doxycycline(DOC). The pollution characteristics and spatial distribution of TC were further analyzed using spatial Kriging interpolation, and the ecological risks of OTC, TC, CTC, and DOC in farmland soils were also assessed. Tetracycline antibiotics were detected in all the soil samples at concentrations ranging from 40.68 to 1074.42 μg·kg-1 and an average of 462.24 μg·kg-1. The average proportions were ranked ΣTCs: CTC(69.26%) > OTC(16.34%) > TC(12.86%) > DOC(1.54%), and CTC pollution was the most serious among. The space tended to be high in the middle and low in the periphery, but the concentrations of TC were highest in the northwest. The average contents of ΣTCs in different soils was ranked as follows:vegetable field(596.01 μg·kg-1) > pasture(487.04 μg·kg-1) > cultivated land(437.52μg·kg-1) > garden plot(404.99 μg·kg-1). The average risk values of OTC, TC, CTC, and DOC in farmland soils were 0.14, 0.69, 0.14, and 1.02, respectively. TC and DOC represented a high level of risk in 23.26% and 6.98% of the samples, respectively, which requires particular attention.
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