摘要
选择上海地区广泛分布的水稻土,通过静态吸附平衡试验,比较土壤去除非晶质氧化铁和去除游离氧化铁后对Pb2+的吸附-解吸行为,采用数学模型拟合,探讨3种土壤的最佳拟合方程、最大吸附的理论值和亲和能力,进而研究非晶质氧化铁和游离氧化铁对Pb2+吸附-解吸的影响。结果表明,去除氧化铁后吸附能力和亲和能力均减弱,原土的最大吸附量为29.21 g/kg,非晶质氧化铁的贡献值为3.52 g/kg,游离氧化铁的贡献值为8.32 g/kg。
Through the static adsorption experiments on selected paddy soil distributed widely in Shanghai,the adsorption-desorption of Pb by removal of amorphous iron oxide and free iron oxide were compared. According to Langmuir,Freundlich and Temkin mathematical models,the best fitting equation of 3 types of soils,the maximum adsorption theoretical value and affinity,the effect of amorphous iron oxide and free iron oxide on the adsorption-desorption of Pb were studied. The results showed that adsorption capacity and affinity were weakened after iron oxide removal,the maximum adsorption capacity of the original soil was 29. 21 g / kg,with the contribution value of 3. 52 g / kg by amorphous iron oxide and 8. 32 g / kg by free iron oxide.
出处
《环境监测管理与技术》
CSCD
2016年第6期60-63,共4页
The Administration and Technique of Environmental Monitoring
基金
上海市科委科技课题"建设场地污染土的快迅诊断与土工处置关键技术研究"支撑基金资助项目(13231202300)
关键词
铅
非晶质氧化铁
游离氧化铁
吸附
解吸
土壤
Pb
Amorphous iron oxide
Free iron oxide
Adsorption
Desorption
Soils
