Effects of exogenous salinity (NaCl) gradient on Cd release in acidified contaminated brown soil

3rd International Conference on Advances in Energy Resources and Environment Engineering

能源学;生态环境科学

Zhang, Lina^1 ; Rong, Yong^1 ; Mao, Li^1 ; Gao, Zhiyuan^1 ; Liu, Xiaoyu^1 ; Dong, Zhicheng^1

School of Resources and Environmental Engineering, Ludong University, Yantai, China^1

关键词: Adsorption site;    Brown soil;    Cation exchanges;    Field investigation;    Indoor simulation;    Research object;    Soil solutions;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/113/1/012189/pdf
DOI  :  10.1088/1755-1315/113/1/012189

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Taking acidified Cd contaminated brown soil in Yantai as the research object, based on different exogenous salinity (NaCl) gradient (0%, 0.3%, 0.6%, 0.9%, 1.5%, 2% and 5%), indoor simulation experiments of Cd release were carried out after field investigation. Results showed that there was a significantly positive relation (r>0.90) between Cd release concentration/amount/ratio and exogenous salt (NaCl). Besides, the more exogenous salt (NaCl) was added; maximum release concentration/amount of Cd appeared the earlier. It was found that exogenous salt (NaCl) addition could obviously promote Cd release from acidified Cd contaminated brown soil. It was believed that this could be mainly due to the cation exchange between Cd2+and Na+, together with the dissociation and/or complexation between Cl-and Cd2+. In addition, available adsorption sites reduction by exchange base in soil causing Cd changed from solid state to soil solution was also a probable reason.