石灰性褐土中柠檬酸对土壤Cu(Ⅱ)、Cd(Ⅱ)吸附-解吸的影响  

Effects of citric acid on Cu(Ⅱ) and Cd(Ⅱ) adsorption & desorption in calcareous cinnamon soil

作　　者：刘世亮[1] 陈娇君[1] 刘芳[1] 介晓磊[1,2] 田春丽[1,3] 

机构地区：[1]河南农业大学资源与环境学院/河南省高校农业资源与环境工程技术研究中心,郑州450002 [2]黄淮学院,驻马店463000 [3]河南农业职业学院,中牟451450

出　　处：《环境化学》2012年第6期849-855,共7页Environmental Chemistry

基　　金：河南省自然科学基金项目(2008A208014)资助

摘　　要：通过室内培养和吸附-解吸实验,研究了不同柠檬酸含量土壤对Cu2+、Cd2+吸附-解吸的影响.结果表明,土壤对Cu2+的吸附量随加入柠檬酸量的增加而明显增加,达到峰值后(柠檬酸含量为0.5 mmol.kg-1),吸附量随柠檬酸含量的增加而下降,即Cu2+的吸附曲线呈峰型.在低柠檬酸含量时,土壤对Cu2+的吸附量受Cd2+浓度影响较小,但随柠檬酸含量的增加,在低铜浓度处理(Cu2+浓度为600 mg·L-1,Cu600)下,土壤对Cu2+的吸附量随Cd2+浓度的增大而增大,但在高浓度铜处理(Cu2+浓度为1000 mg·L-1,Cu1000)下,土壤对Cu2+的吸附量随Cd2+浓度的增加而减少.Cu2+的解吸量随柠檬酸含量的增加而总体上降低;相同柠檬酸含量下,Cu600处理下,Cd2+浓度为10 mg·L-1(Cd10)条件下Cu2+解吸量明显低于无Cd2+(Cd0)和Cd2+浓度为1 mg·L-1(Cd1)条件下.而Cu1000处理下,Cd2+的浓度对Cu2+解吸量的影响较小.Cd2+吸附量随柠檬酸含量的增加无明显变化,但随Cu2+浓度的增加下降明显,其中无Cu2+处理Cd2+吸附量极显著地高于Cu600和Cu1000处理,而Cu600和Cu1000处理间差异不显著,且土壤对Cd2+的吸附随镉添加量增加而增加;Cd2+的解吸量随柠檬酸含量的增加先增大后保持稳定,在柠檬酸含量为0.5 mmol.kg-1时达到最大,Cu600处理的Cd2+的解吸量显著地高于Cu1000处理.The effect of citric acid （CA） on Cu（ Ⅱ ） and Cd（Ⅱ ） adsorption-desorption in calcareous cinnamon soil was investigated by incubated method. The results showed that Cu2 ＋ adsorption increased with the increase of CA concentration, and after the adsorption amount reach maximum value （ CA content was 0. 5 mmol- kg- 1 ）, Cu2 ＋ adsorption then decreased with CA concentration increase. The effect of Cd2 ＋ on Cu2 ＋ adsorption amount was very little under the low of CA concentration. When CA concentration increased, Cu adsorption amount would increase under low Cu2 ＋ concentration （Cu2 ＋ concentration was 600 mg. L-1, Cu600） and decrease under high Cu2 ＋ concentration （Cu2 ＋ concentrations was 1000 mg. L-1 , Cul000） as the Cd2 ＋ concentration increased. Cu2 ＋ desorption amount decreased with CA concentration increase. Under the same concentration of CA, Cu2 ＋ desorption amount under Cdl0 （Cd2 ＋ concentration was 10 mg. L-l） treatment was significantly lower than that under Cd0 （ Cd2 ＋ was 0 mg＂ L- 1 ） and Cdl （ Cd2 ＋ concentration was 1 mg. L- 1 ） treatment when the Cu concentration was 600 mg. L-1, however, it was not affected by Cd2 ＋ concentration when the Cu2 ＋ concentration was 1000 mg. L-1. There was no significantly change for Cd2 ＋ adsorption amount when CA concentration increase, but it decreased significantly with Cu2 ＋ concentration increase, and the Cd2 ＋ adsorption amount under CuO （ Cu2 ＋ was 0 mg- L - 1 ） treatment was significantly higher than that under Cu600 and Cul000 treatment. There was not significantly different between Cu600 treatment and Cul000 treatment. And Cd2 ＋ adsorption amount increased significantly with the addtion of Cd2 ＋. Cd2 ＋ desorption amount increased intially then kept stabilization with CA concentration increase. When CA concentration was 0.5 mmol. kg-1, Cd2 ＋ desorption amount reach maximum value, and the desorption amount was significantly higher under Cu600 treatment than that under

关 键 词：柠檬酸 Cu(Ⅱ) Cd(Ⅱ) 吸附 解吸 

分 类 号：X131.3[环境科学与工程—环境科学]