环境工程学报2017，Vol.11Issue(9)：5298-5306,9.DOI:10.12030/j.cjee.201612218
多种有机酸对土壤中碳酸镉的活化效应
Mobilization effects of various organic acids on cadmium carbonate in soil
摘要
Abstract
This paper investigated the impact of 44 organic acids on mobilization of cadmium carbonate.The impact of five organic acids with best performance on Cd mobilization in garden soil was also examined.The results showed that the mobilization ability of low molecular weight organic acids (LMWOAs), phenolic acids (PAs)and amino acids (AAs) on cadmium carbonate were significantly different.The mobilization ability of LMWOAs was stronger than PAs and AAs.The mobilization rates of oxalic acid and citric acid were 7.48％ and 7.06％ ,respectively.Based on equivalent molarity of organic acid, the mobilized Cd by citric acid was 22.73 mg · L-1,followed by malic acid and cis-aconitic acid, which were 14.55 mg · L-1 and 12.75 mg · L-1 , respectively.The effect of PAs mobilization is not obvious.Among AAs, the mobilization effect of aspartic acid, histidine and glutamate was relatively strong and the rest were not significant.The main mechanism of Cd mobilization by citric acid was complexing, while the acid-soluble effect mainly contributes to Cd mobilization by oxalic acid.The citric acid with strongest ability to cadmium carbonate mobilization also had strongest ability to mobilize Cd in sewage-irrigated soil, and its mobilized Cd concentration reached the level of food safety risk.关键词
有机酸/碳酸镉/活化Key words
organic acid/cadmium carbonate/mobilization分类
资源环境引用本文复制引用
魏佳,李取生,徐智敏,周雪芳,杨耀帅,陈柯罕,林欣..多种有机酸对土壤中碳酸镉的活化效应[J].环境工程学报,2017,11(9):5298-5306,9.基金项目
国家自然科学基金资助项目(41371321) （41371321）
广东省科技计划项目(2016A020221015,2017A010105005) （2016A020221015,2017A010105005）
