摘要
通过室内土柱淋溶试验,对2种磺胺类抗生素——磺胺嘧啶和磺胺甲基异噁唑在土壤中的淋溶行为,及其受到淋溶流速、淋溶浓度和不同剖面土壤理化性质的影响进行了研究.结果表明,随着剖面土层深度增加磺胺类抗生素的淋出速率变快且在土柱中的残留量减少,磺胺甲基异噁唑在0~20 cm土层土柱中的残留含量是其在40~60 cm土层土柱中的2倍.淋溶流速越快,淋出液中磺胺类抗生素浓度越大且在土柱中的残留含量越低.用浓度为500μg·L-1淋溶液以2 mL·min-1的速度淋溶时,淋出液中磺胺类抗生素的浓度接近500μg·L-1,而以1 mL·min-1和1.5 mL·min-1速度淋溶时,其浓度仅为100~200μg·L-1.随淋溶液浓度升高,磺胺类抗生素淋溶性增强,其在土柱中的残留含量也明显增高.用浓度为250μg·L-1和125μg·L-1淋溶液以2 mL·min-1进行淋溶时,磺胺甲基异噁唑在淋出液中仅有少量检出,而用浓度为500μg·L-1淋溶液淋洗时,其在淋出液中的浓度接近500μg·L-1,其在土柱中的残留含量是低浓度淋溶液淋溶时的2~3倍.本研究结论可为管理含磺胺类抗生素的水源灌溉方式提供理论依据.
Leaching characteristics and influencing factors of the typical sulfa antibiotics-sulfadiazine and sulfamethoxazole were studied by soil column experiments. The results showed that the leaching rate increased and the residues of sulfa antibiotics in soil column decreased as the soil profile depth increased. The residual concentration of sulfa antibiotics in column filled with 0-20 cm profile soil was 2 times higher than that with 40-60 em profile soil. The concentration of sulfa antibiotics in the leaehate was higher, while the residual concentration in the soil column was lower under a higher leaching velocity. The concentration of sulfa antibiotics in the leaehate was close to 500 p^g.L-I when the leaching velocity was 2 mL.min-l, while the concentration of sulfa antibiotics in the leachate was between 100-200 trg＂ L-1 when the leaching velocity was 1 and 1.5 mL.min-1. The concentrations of sulfa antibiotics in the leachate and soil column increased as the concentration of leaching solution increased. The concentration of sulfa antibiotics in the leaehate was close to 0 μg. L - 1 when the concentration of leaching solution was 250 μg. L -1 and 125 ixg. L 1. When the concentration of leaching solution was 500 μg. L-1, the concentration of sulfa antibiotics in the leachate was close to 500 μg. L-1 and the residue concentration in the soil column was 2 to 3 times higher than that with lower concentration of leaching solution. The results in this research may provide a scientific basis for water irrigation with anibiotics.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2013年第10期4042-4049,共8页
Environmental Science
基金
国家自然科学基金项目(41001330)
关键词
磺胺嘧啶
磺胺甲基异噁唑
土柱
淋溶
土壤
sulfadiazine（SDZ）
sulfamethoxazole（SMZ）
soil column
leaching
soil
