摘要
为探讨螯合剂对植物修复的影响,采用模拟铀镉复合污染土壤的盆栽试验,研究了3种可降解螯合剂乙二胺二琥珀酸(EDDS)、草酸(OA)和柠檬酸(CA)在不同浓度(0.0、2.5、5.0、7.5mmol/kg)下对吊竹梅吸收、转运、富集U和Cd的影响。结果表明:吊竹梅生长受螯合剂种类及浓度的影响,高浓度(7.5mmol/kg)的EDDS对吊竹梅有较大的毒害作用,而低浓度(2.5mmol/kg)的CA和OA显著促进吊竹梅的生长;螯合剂可促进吊竹梅对U和Cd的吸收和转运,其中,用5.0mmol/kg CA处理时,吊竹梅单株U含量达到峰值,为205.9mg/kg,是对照组(即0mmol/kg处理)的5.68倍,用5.0 mmol/kg EDDS处理时,吊竹梅单株Cd含量达到的峰值为47.03mg/kg,是对照组的2.65倍;在7.5 mmol/kg CA处理下,吊竹梅的U转运系数最高为0.342,是对照组的2.36倍,而EDDS对Cd的转运效果较佳;从单株U、Cd富集量来看,CA不仅对促进吊竹梅富集U的效果最佳,同时,对Cd也有一定效用,而EDDS仅能促进吊竹梅富集Cd,OA对U和Cd的富集效果均较差;此外,CA、EDDS的添加分别增强了土壤中U和Cd的有效态含量。综合而言,施加适宜浓度的螯合剂能增强吊竹梅对U和Cd污染土壤的修复效率。
To explore the effects of chelating agent on the phytoremediation in U and Cd contaminated soil,apot experiment was performed to study the effects of 3 chelatingagents（EDDS,OA and CA）and their additive concentrations（0.0,2.5,5.0,7.5 mmol/kg）on U and Cd extraction,translocation,and accumulation in Zebrina pendula.The results show that the growth of Zebrina pendulais affected by the type and concentration of chelating agents.The addition of 7.5 mmol/kg EDDS inhibits the growth of Zebrina pendula.The application of 2.5 mmol/kg OA and CA increases the net weight of Zebrina pendula.The chelating agents have a positive effect on the uptake and translocation of U and Cd in Zebrina pendula.Applying 5.0 mmol/kg CA,the U content maximally increases by 5.68 times of control check,with levels of 205.9 mg/kg attained.Applying 5.0 mmol/kg EDDS,the Cd content maximally increases by 2.65 times of control check,with levels of 47.03 mg/kg attained.The maximum value of the U translocation factor is 0.342 when CA concentration is 7.5 mmol/kg,which is 2.36 times of that of control check.EDDS could better improve the translocation factor of Cd.Based on the results of U and Cd bioaccumulation,it is concluded that CA has the greatest effect on the accumulation of U and also has effect on that of Cd,EDDS has effect on the accumulation of Cd,while OA has no effect on the accumulation of U and Cd.The addition of CA and EDDS respectively enhances the available contents of U and Cd in soil.These results suggest that chelating agents could improve the effectiveness of phytoremediation with Zebrina pendulain soil contaminated with U and Cd.
作者
陈立
王丹
龙婵
崔正旭
CHEN Li;WANG Dan;LONG Chan;CUI Zhengxu(College of Life Science and Engineering,Southwest University of Science and Technology,Mianyang 621010,China;State Defense Key Laboratory of Nuclear Waste and Environmental Security Southwest University of Science and Technology,Mianyang 621010,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2018年第8期1359-1366,共8页
Atomic Energy Science and Technology
基金
国防基础科研计划资助项目(16ZG6101
JCKY2016404C002)
西南科技大学研究生创新基金资助项目(15ycx076)
关键词
螯合剂
吊竹梅
铀
镉
富集
chelating agent
Zebrina pendula
uranium
cadmium
bioaccumulation
