Abstract
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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