中文摘要：

为了阐明土壤组分以及各种环境因素对抗生素吸附行为的影响,通过批量吸附实验系统地研究了环丙沙星（CIP）在黑土（BS0）以及连续去除有机质（BS1）和去除铁氧化物（BS2）组分上的吸附行为,同时考虑了pH值、Cu2+和Ca2+的影响。结果表明,三种土样（BS0、BS1、BS2）对CIP的吸附能力为BS0>BS1≈BS2,pH 6条件下最大Kd值分别为9008、5063 L·kg-1和4583 L·kg-1,说明土壤有机质对CIP持留的贡献最大,其次为黏土矿物,相对而言铁氧化物的贡献最小。CIP在黑土表面的吸附以阳离子交换以及与有机质配合作用为主,土壤溶液p H值对CIP的持留有强烈影响,低pH更有利于CIP的吸附。金属离子Cu2+和Ca2+对CIP吸附的影响不同:Cu2+表现为随pH值升高先竞争抑制后络合促进,Ca2+主要为竞争抑制作用,这源于金属与CIP之间的配合能力的不同;另一方面,CIP的存在可促进Cu2+在酸性条件下的吸附,可能由于形成"土壤-CIP-Cu"三元表面络合物所致。

英文摘要：

Antibiotic contamination in the environment has drawn wide concerns. Its adsorption in soil may affect its fates in soil environ-ment. An experiment was performed to determine the effects of soil components(organic matter, iron oxides)and various environmental fac-tors(pH, Cu2+and Ca2+)on ciprofloxacin(CIP)adsorption onto a black soil(BS0)using batch adsorption experiment. Adsorption capacity of CIP was BS0 BS1(organic matter removal)≈BS2(organic matter and iron oxides removal). The maximum Kd value was 9008 L·kg-1, 5063 L·kg-1, and 4583 L·kg-1 for BS0, BS1, and BS2, respectively, indicating that soil organic matter was the main contributor to CIP reten-tion in soil, followed by soil clay minerals. The main adsorption mechanisms of CIP by BS0 were complexation with soil organic matters and cation exchange with clay minerals. Low pH favored CIP adsorption. Divalent cation Cu2+showed different effects on CIP adsorption, de-pending on pH:at pH≤6 it slightly depressed CIP adsorption on BS1 and BS2 because of the competition; while at pH﹥6 it significantly promoted the adsorption. Compared with Cu2+, Ca2+suppressed CIP adsorption at the tested pH range by acting as a competiting cation. On the other hand, CIP could promote Cu2+adsorption under acidic condition, which might be a result of forming a "soil- CIP- Cu" ternary surface complex.