文献类型：期刊文献

中文题名：钛石膏作土壤镉污染改良剂的可行性分析

英文题名：Red gypsum as a feasible additive for remediation of cadmium in soil

作者：黄佳乐[1];武斌[1];陈葵[1];范先国[2];周晓葵[2]

机构：[1]华东理工大学化学工程研究所,上海200237;[2]四川龙蟒集团

年份：2016

卷号：48

期号：10

起止页码：68

中文期刊名：无机盐工业

外文期刊名：Inorganic Chemicals Industry

收录：CSTPCD;;北大核心:【北大核心2014】；

语种：中文

中文关键词：钛石膏;镉污染;改良剂;可行性

外文关键词：red gypsum; Cd pollution; ameliorant; feasibility

摘要：采用等温吸附法研究了钛石膏对镉离子的吸附作用,实验测定了钛石膏对土壤的酸碱中和能力,在此基础上考察了含镉土壤中添加钛石膏作为土壤改良剂后土壤有效镉含量的变化。结果表明,钛石膏对镉具有良好的吸附作用,吸附过程符合Langmuir方程,pH=6时的最大吸附量为18.29 mg/g,吸附量随pH升高而增加;钛石膏的酸碱中和能力测定结果表明,将钛石膏添加到土壤不仅能有效提高土壤pH、降低镉的生物有效性,还能提高土壤pH的稳定性;添加钛石膏能够有效降低土壤镉的生物有效性,用氯化镁、二乙烯三胺五乙酸(DTPA)、氯化氢提取土壤有效镉含量的结果表明,这3种提取剂对应的土壤有效镉质量分数最大下降幅度为39%、33%和17%;钛石膏的重金属含量测定及浸取毒性检验结果表明,钛石膏作为土壤改良剂没有对土壤和地下水产生危害的风险。综合考虑钛石膏对土壤镉污染的抑制和钛石膏自身肥效,它可作为一种有效的土壤镉污染改良剂。
The adsorption behavior of red gypsum（RG） to cadmium was studied by isothermal adsorption method and the neutralization ability of RG to soil was determined.Then the change of effective Cd content in the Cd-contaminated soils with adding RG as soil ameliorant was researched.The Langmuir model was found to describe well the adsorption process,where maximum adsorption capacity was 18.29 mg/g at pH of 6.The adsorption capacity increased with the increase of pH.The acid and basic neutralization capacity tests of RG showed that the addition of RG to the soils could increase the soil pH and its stability,thus decreased Cd-bioavailability.The application of RG was found to significantly reduce the MgCl_2,DTPA and HCl extractable Cd concentrations in soil,the highest decreases were 39%,33%,and 17% respectively.The leaching toxicity and heavy metal concentrations of RG were also studied,and it had no hazards to soil and groundwater.Comprehensively considering the inhibition of Cd-contamination and fertilizing effect itself,RG could be an effective,feasible and environmental additive for the remediation of cadmium in soil.