螯合剂GLDA对土壤Cr的淋洗修复研究

采用螯合剂GLDA（谷氨酸，N，N-乙酰乙酸四钠）对Cr污染土壤进行批次淋洗，考察不同浓度和pH值的GLDA对土壤中Cr淋洗的效果，并比较GLDA与乙二胺四乙酸（EDTA）的淋洗差异，筛选优化GLDA淋洗土壤中Cr的过程中淋洗时间、水土比和淋洗次数等条件。结果表明：在低浓度时GLDA去除土壤中Cr的效果明显优于EDTA，当GLDA浓度为0．70％时淋洗率达到最高，为67．59％。在酸性和碱性条件下，GLDA与EDTA淋洗效果差异不显著。优化得出的最佳淋洗条件为淋洗时间24h，水土比25：1，淋洗次数2次。对土壤中Cr进行形态分析发现，GLDA可以有效去除弱酸提取态以及可还原态的Cr，部分去除可...

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Bibliographic Details
Published in西南农业学报 Vol. 29; no. 10; pp. 2422 - 2426
Main Author 胡造时 莫创荣 戴知友 胡吉卓 覃利梅
Format Journal Article
LanguageChinese
Published 广西大学环境学院,广西南宁,530004%广西大学化学化工学院,广西南宁,530004 2016
Subjects
Cr
GLDA
土壤修复
批次淋洗
重金属
Soil remediation
GLDA
土壤修复
批次淋洗
Chromium
Batch leaching
重金属
Cr
Heavy metal
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ISSN1001-4829
DOI10.16213/j.cnki.scjas.2016.10.031

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Summary:采用螯合剂GLDA（谷氨酸，N，N-乙酰乙酸四钠）对Cr污染土壤进行批次淋洗，考察不同浓度和pH值的GLDA对土壤中Cr淋洗的效果，并比较GLDA与乙二胺四乙酸（EDTA）的淋洗差异，筛选优化GLDA淋洗土壤中Cr的过程中淋洗时间、水土比和淋洗次数等条件。结果表明：在低浓度时GLDA去除土壤中Cr的效果明显优于EDTA，当GLDA浓度为0．70％时淋洗率达到最高，为67．59％。在酸性和碱性条件下，GLDA与EDTA淋洗效果差异不显著。优化得出的最佳淋洗条件为淋洗时间24h，水土比25：1，淋洗次数2次。对土壤中Cr进行形态分析发现，GLDA可以有效去除弱酸提取态以及可还原态的Cr，部分去除可氧化态的Cr，有效地降低土壤中Cr的毒性和生物有效性。
Bibliography:HU Zao-shi1 , MO Chuang-rong1 , DAI Zhi-you1 , HU Ji-zhuo2 , QIN Li-mei1 （ 1. College of the Environment, Guangxi University, Guangxi Nanning 530004, China ;2. College of the Chemistry and Chemical Engineering, Guangxi University, Guangxi Nanning 530004, China）
A chelate agent, N, N-bis （carboxymethyl） glutamic acid tetrasodium （GLDA） , was used as the eluting agent for the batch leaching experiments of chromium contaminated soil. The effects of GLDA concentration, pH, contact time,liquid/soil ratio, and extraction times on the removal rate of chromium were studied. The removal efficiencies of GLDA and EDTA were compared. The results showed that the removal efficiency of GLDA was higher than that of EDTA at low eluting agent concentration. The highest leaching rate of 67.59 % was obtained when GLDA concentration was 0.70 %. Acidic and alkaline conditions, the differences of leaching effect between GLBA and EDTA was not significant. The leaching condition of chromium with GLDA as eluting agent was optimized as
ISSN:1001-4829
DOI:10.16213/j.cnki.scjas.2016.10.031