摘要
通过等温吸附试验和吸附动力学试验,研究了NaCl对贵州万山、石阡、松桃、德江、江口5个地区道路周边混合土壤中Hg2+的吸附解吸行为。结果表明,Hg2+在土壤中的吸附行为由于溶液中加入NaCl而有所差异。在同一浓度NaCl作用下,当Hg2+浓度小于3.00mg/L时,NaCl对Hg2+的吸附有促进作用;当Hg2+浓度大于3.00mg/L时,NaCl对Hg2+的吸附又显示出抑制作用,且随着NaCl浓度的增加抑制作用增强;添加NaCl使Hg2+最大吸附量最多可降低63.64%。解吸率也因NaCl的加入有所改变。0.01mol/LKNO3溶液对Hg2+的解吸率达3.31%～6.78%,而0.01mol/LKNO3+NaCl溶液对Hg2+的解吸率达21.5%～47.3%。吸附动力学试验结果表明,5个动力学方程都拟合得很好,方程的相关系数R2均在0.9以上,只是吸附过程有所不同。NaCl增大了Hg2+在土壤中的流动性,对Hg2+的迁移转化产生很大的影响。
An investigation on the effects of NaCl on adsorption of Hg^2＋ in Wanshan,Shiqian,Songtao,Dejiang and Jiangkou in Guizhou Province was carried out using isothermal adsorption and kinetic experiment.The results showed that the adsorption behaviour of Hg^2＋ was different when NaCl was carried into solution.In the mixed soil,NaCl enhanced Hg^2＋ adsorption obviously when the concentration of Hg^2＋was lower than 3.00 mg/L.The reduced effect was influenced by different contamination of NaCl.The addition of NaCl made the max adsorption of Hg^2＋ decreased 63.64%.The desorption rate of Hg^2＋was changed by the addition of NaCl.The rate of Hg^2＋ was between 3.31% and 6.78% in 0.01 mol/L KNO3 solution,but it was between 21.5% and 47.3% in 0.01 mol/L KNO3＋NaCl solution.The results of kinetic experiment showed that the characteristics of Kinetics equation of mercury adsorption were above 0.9 and the process of adsorption was different.The mobility of mercury was increased by NaCl and it could brought Hg^2＋ moving.
出处
《安徽农业科学》
CAS
北大核心
2010年第25期13750-13753,共4页
Journal of Anhui Agricultural Sciences
基金
中国自然科学基金项目(20967001)
贵州省科技攻关项目(黔科合SZ字[2008][3010])
