摘要
在重金属污染土壤稳定化修复实践中,通常采用不同的浸提方法测定土壤中重金属由高活性态向低活性态的转化情况,进而评估污染土壤中重金属的稳定化修复效果。采用硫酸硝酸(AA)法、TCLP法、DTPA法和连续分级提取法评估了污染土壤中重金属铅和镉的稳定化修复效果,比较了不同浸提方法评估结果的差异及相关性。结果表明:AA法、TCLP法和DTPA法对污染土壤中铅和镉的浸提量均随着稳定化材料投加量的增加而下降,采用不同浸提方法得到的污染土壤中铅和镉的浸提量表现为DTPA法>TCLP法>AA法,且采用3种浸提方法得到的污染土壤中铅和镉的浸提量与重金属活性态(B1)均呈极显著的正相关关系,与重金属潜在活性态(B2)和稳定态(B3)均呈极显著的负相关关系,污染土壤中铅和镉的浸提量变化可反映土壤中铅和镉由活性态向潜在活性态和稳定态的转化情况;随着稳定化材料投加量的增加,不同浸提方法得到的污染土壤中铅和镉的稳定化率有一定的差异,但变化趋势基本相似。
In the practice of immobilization remediation of heavy metal contaminated soil,different extraction me-thods are usually used to determine the transformation of heavy metal from high active state to low active state in soil,so as to evaluate the remediation effect.This paper applies the sulphuric acid-nitric acid(AA)method,TCLP method,DTPA method and sequential extraction procedure to evaluating the immobilization effect of lead and cadmium,and then compares the difference and correlation of evaluation results of different methods.The results show that the amount of Pb and Cd extracted by AA method,TCLP method and DTPA method decreases with the increase of stablization material dosage,and the amount of Pb and Cd extracted by DTPA method>TCLP method>AA method,and the amount of Pb and Cd extracted by AA method is significantly positively correlated with active state(B1),and negatively correlated with potential active state(B2)and stable state(B3).The change of extraction amount can reflect the transformation from active state to potential active state and stable state of lead and cadmium.With the increase of the amount of stablization materials,the immobilization rate of lead and cadmium obtained by different methods is different,but the trend is similar.
作者
刘千钧
周阳媚
唐杰鹏
陈肇伟
罗家仪
林亲铁
王鹏
LIU Qianjun;ZHOU Yangmei;TANG Jiepeng;CHEN Zhaowei;LUO Jiayi;LIN Qintie;WANG Peng(School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou 510006,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2021年第4期188-193,共6页
Safety and Environmental Engineering
基金
广东省重点研发专项项目(2019B110207001)
广东省国际合作项目(2021A0505030045)。
关键词
污染土壤
铅
镉
稳定化
修复效果评估
contaminated soil
lead
cadmium
immobilization
remediation evaluation
