摘要
研究了磺胺甲恶唑(SMX)在11种土壤上的吸附行为.相关性分析表明,单一的土壤性质与表观吸附没有表现出明显的相关关系,SMX在土壤中的吸附可能受憎水性作用、阳离子交换、表面积等多个机理或因素的共同作用.进而研究了Ca2+、Mg2+、Zn2+3种金属离子与SMX在土壤中的共吸附.其中,Zn2+显著地促进了SMX的表观吸附,而Ca2+、Mg2+两种离子对SMX的吸附没有明显的影响.同时,SMX的存在也影响了3种离子的吸附行为,Ca2+和Mg2+的吸附降低,而Zn2+的吸附受SMX的影响不大.可能是由于Zn2+在土壤中是内界吸附,占据了内部的位点,取代了大量的H原子,使表面的负电荷减弱,降低了土壤与SMX的排斥作用,从而使其吸附增加.
This study investigated the adsorption behavior of sulfamethoxazole （SMX） on 11 soils collected in Yunnan Province. The correlation between individual soil properties and the apparent sorption coefficients was not significant, indicating that SMX sorption on the soil may be controlled by various mechanisms. The presence of Ca2＋ , Mg2＋ or Zn2＋ in the sorption system showed distinct influences on SMX adsorption. Among the three metal ions, Zn2＋ dramatically increased SMX sorption, while Ca2＋ and Mg2＋ did not alter SMX sorption significantly. The sorption of SMX also decreased Ca2＋ or Mg2＋ adsorption, but didn＇t decrease Zn2＋ adsorption. This phenomenon may be resulted from inner-sphere complexation of Zn2＋ with soil particles, which consequently resulted in the occupation of the internal sites and replacement of H ＋. This process led to the decrease of the negative surface charge, and decline of the repulsion between soil and SMX.
出处
《环境化学》
CAS
CSCD
北大核心
2013年第4期640-645,共6页
Environmental Chemistry
基金
国家自然科学基金(40973081
40803034)
教育部留学回国人员启动基金
云南省学术带头人后备人才项目资助
关键词
抗生素
环境归趋
药物
土壤
吸附
antibiotics, environmental fate, pharmaceuticals, soil, adsorption.
