生态环境学报2016，Vol.25Issue(4)：724-728,5.DOI:10.16258/j.cnki.1674-5906.2016.04.025
冻融周期对棕壤性质及砷吸附解吸特性的影响
Effects of Freeze-thaw on Soil Characters and Arsenate Adsorption and Desorption
摘要
Abstract
Freeze-thawing is the common natural phenomena in northern China whichis the role of abiotic stress in soil. Freeze-thawing could influence the minerals, charge and organic material quantity, it also could influence the kind of charge and organic material form in soil. This study was based on brown soil test materials. Indoor experiment were employed to investigate the effects of arsenate adsorption and desorption ability in soils under different freeze-thawing treatments and its influencing factors. The results showed that the arsenate adsorption ability on soils could be well-described by the Langmuir equation.When the arsenic content in liquid balance was 15mg·kg-1, arsenic adsorption was tended to equilibrium state in soil. The amount of arsenate adsorption tened to increase with the the increasing of arsenate concentration. Compared with the no freeze-thaw treatments samples, arsenate adsorption capability of soils was significantly greater than unfreeze-thaw treatments samples. The amount of arsenate desorption of soils tended to decline when the amount of arsenate adsorption of soils were declined. The amount of arsenate desorption tened to increase with the the increasing of the amount of arsenate adsorption. Compared with the no freeze-thaw treatments samples, the amount of arsenate desorption of freeze-thaw treatments tened to increase with the rising cycles of freeze-thaw. The Arsenate maximum buffer capacity (MBC) of freeze-thaw soils closely related to pH, organic matter (OM), cation exchange capability (CEC), negative variable charge (CECv) and the degree reached 0.01 or 0.05 significance level. Meanwhile, the effects of CECv in freeze-thaw soils could be the main reason for the difference of soils arsenate adsorption and desorption under different freeze-thaw treatments. Explore the effects of arsenate adsorption and desorption ability in soils under different freeze-thawing treatments and its influencing factors could provide data reference and theoretical basis for restoration and ecological environment risk evaluation of the soil pollution under freeze-thawing area of arsenic which has important theoretical and realistic significance.关键词
冻融/砷/吸附-解吸Key words
freeze-thaw/arsenate/adsorption-desorption分类
资源环境引用本文复制引用
孙跃嘉,田甜,何娜,叶祝弘,孙明慧,杨丹..冻融周期对棕壤性质及砷吸附解吸特性的影响[J].生态环境学报,2016,25(4):724-728,5.基金项目
国家自然科学基金项目 （）
