金霉素与强力霉素在不同剖面土壤中的淋溶行为研究

Leaching behavior of chlortetracycline and doxycycline in different soil profiles

环境中的抗生素主要通过有机添加物如污水污泥、牲畜粪便和泥浆进入土壤,采用土柱淋溶法研究了不同初始浓度金霉素与强力霉素在不同剖面土壤(0~30、30~60、60~90 cm)淋溶与各土层渗滤液变化。结果表明,金霉素与强力霉素在土壤中残留浓度均表现为表土层>中土层>底土层;各土层渗滤液抗生素浓度均呈现先快速达到峰值随后逐渐降低的趋势,且强力霉素的淋溶特性强于金霉素。综合这2种抗生素在剖面土壤中的淋溶特性发现,金霉素与强力霉素可以在土壤中向下迁移至深层土壤,且污染物浓度越大在土壤中的残留浓度越大,对生态及地下水存在一定的风险。

Antibiotics in the environment enter the soil mainly through organic additives such as sewage sludge,livestock manure and mud.In order to explore the leaching behavior of tetracycline antibiotics in different sections of soil,the soil column leaching method is utilized to study the leaching behaviors of different initial concentrations of chlortetracycline and doxycycline in different soil profiles(0-30,30-60,60-90 cm),and leachate changes at each soil layer.It is shown that the residual concentrations of both chlortetracycline and doxycycline in the surface layer of soil are larger than that in the middle soil layer,that in the subsoil layer is the fewest.The concentration of antibiotics in the leachate of each soil layer shows a trend of rapidly reaching the peak value and then gradually decreasing,and the leaching characteristics of doxycycline is stronger than that of chlortetracycline.Chlortetracycline and doxycycline both can migrate down to the deep soil,and the higher the concentration of pollutants,the greater the residual concentration in the soil.