摘要
采用平衡液吸附法和CaCl2与HCl溶液的连续解吸法研究了太湖地区水稻土(黄泥土)在pH值为2~6范围内pH值对Cu2+的静电吸附和专性吸附的影响以及吸附过程土壤溶液pH值的变化.研究结果表明,吸附量随pH值升高而增加.低pH值条件下利于静电吸附,吸附过程H+减少使平衡液pH值上升;高pH值条件下主要是专性吸附所控制,释放H+使平衡液pH值下降.所以土壤酸化可以增加重金属的生物有效性,降低土壤对重金属的缓冲能力.
Paddy soil samples are collected in Tai Lake region. The effects of electrostatic sorption and the special specific sorption of Cu^2＋ by paddy soil are studied using equilibrium adsorption method and continuous desorption method of CaCl2 and HCl solution with pH value from 2 to 6. The results showed that sorption amounts of Cu^2＋ increased with pH value enhancing in soil balance solution. Reaction is dominated by electrostatic sorption under low pH value and pH value increased with decreasing H ^＋ in balance solution, while special sorption under high pH value with pH value decreased with releasing H^＋ in balance solution. It suggested that soil acidification cause heavy metal availability increasing and buffer capacity decreasing in paddy soil.
出处
《哈尔滨商业大学学报（自然科学版）》
CAS
2008年第3期309-312,共4页
Journal of Harbin University of Commerce：Natural Sciences Edition
基金
国家自然科学基金重点项目(40231016)
关键词
PH值
水稻土
CU^2+
静电吸附
专性吸附
pH value
paddy soil
Cu^2＋
electrostatic adsorption
specific adsorption
