无患子联合EDTA-2Na协同洗脱高细粒土壤中Pb和Cd  

Synergistic Elution of Pb and Cd from High Fine-grained Soil Using Sapindus Combined with EDTA-2Na

作　　者：何苏祺 李正 陈建学 HE Suqi;LI Zheng;CHEN Jianxue(Fujian Longking Co.,Ltd.,Longyan,Fujian 364000,China)

机构地区：[1]福建龙净环保股份有限公司,福建龙岩364000

出　　处：《土壤》2024年第5期1144-1150,共7页Soils

基　　金：福建龙净环保股份有限公司项目(201907)资助。

摘　　要：利用振荡淋洗试验探讨不同浓度的无患子(WHZ)和EDTA-2Na用量对重金属Pb、Cd的去除效果,并选择合适的淋洗方式,探究其最佳淋洗参数,分析淋洗前后重金属形态变化。结果表明,“WHZ+EDTA-2Na”淋洗参数中固液比为1∶3,优选的用量为EDTA-2Na为1 g,无患子粗提液浓度为5 g/L,淋洗2 h对Pb和Cd的去除率分别达到76.50%和73.40%。无患子粗提液联合低浓度EDTA-2Na复合淋洗效果均优于单独淋洗,其中两者混合淋洗组合效果最好。形态分析结果表明,复配淋洗剂对土壤中重金属Cd的可交换态和Pb的铁锰氧化物态有较好的洗脱效果。The effects of different concentrations of Sapindus(WHZ)and EDTA-2Na on the removal of Pb and Cd were investigated by oscillatory leaching test,the suitable leaching method was selected,the best leaching parameters were explored,and the morphological changes of Pb and Cd before and after leaching were analyzed.The results showed that the solid-liquid ratio of“WHZ+EDTA-2Na”leaching parameters was 1:3,the optimal dosage was 1 g EDTA-2Na,the concentration of Sapindus crude extract was 5 g/L,and the removal rates of Cd and Pb reached 76.50%and 73.40%,respectively,after 2 h of leaching.The effect of Sapindus crude extract combined with low concentration EDTA-2Na was better than that of single leaching,and the combination of the two was the best.Form analysis showed that the complex eluent had a good elution effect on the exchangeable state of Cd and Fe-Mn oxide state of Pb in soil.

关 键 词：无患子粗提液 EDTA-2Na Pb、Cd污染土壤 复配淋洗 重金属形态分析 

分 类 号：X53[环境科学与工程—环境工程]