上海苏州河底泥重金属淋洗效果的研究  

Chemical Leaching and Dissolution of Heavy Metals in the Sediments of Suzhou River in Shanghai

作　　者：李慧[1,2] 王增长[1] 黄仁华[2] 施永军[2] 赵由才[2] 

机构地区：[1]太原理工大学环境科学与工程学院,山西太原030024 [2]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《有色冶金设计与研究》2010年第2期41-44,共4页Nonferrous Metals Engineering & Research

基　　金：上海市科委2008年重大项目(08DZ1208100)

摘　　要：采用批提取实验(batch experiment),利用柠檬酸溶液、酒石酸溶液、聚天冬氨酸溶液及EDTA溶液依次淋洗受重金属污染的苏州河底泥。分析不同溶液在不同浓度下其淋洗液中的重金属含量及其浸提率,优化重金属淋洗试剂及其相应的浓度。结果表明,柠檬酸溶液、酒石酸溶液和EDTA溶液对底泥重金属均有显著的淋滤效果,其中,柠檬酸溶液的淋洗效果最好,其浓度为0.75mol/L时,对不同重金属的浸提率均在90%以上。聚天冬氨酸溶液对重金属的浸提能力相对较差,对底泥中的Cu淋洗能力较强,但浸提率亦不足60%。聚天冬氨酸对碳酸盐态重金属有较好的淋洗效果,酒石酸淋洗可去除交换态、碳酸盐结合态和氧化物结合态的重金属。In this work, citric acid, tartaric acid, PASP and EDTA solutions were used to wash out heavy metal- contaminated sediments of Suzhou River in Shanghai China. The experimental results showed that citric acid, tartaric; acid and EDTA can be used for the effective leaching and dissolution of the heavy metals present in the sediments while PASP showed an ineffective performance. When the concentrations of citric acid solutions was 0.75 mol/L, the dissolution of all the heavy metals were found to be over 90%, and less than 60% of dissolution of Cu may be obtained using PASP as the leaching agent. However, PASP may be used for the removal of heavy metals with carbonate states, while tartaric acid for the heavy metals with the exchangeable, carbonate and oxidizable states.

关 键 词：底泥 重金属 淋洗 

分 类 号：X703.1[环境科学与工程—环境工程]