生态与农村环境学报2025，Vol.41Issue(4)：550-559,10.DOI:10.19741/j.issn.1673-4831.2024.0094
可生物降解螯合剂谷氨酸N,N-二乙酸和氨三乙酸强化红苋修复镉污染土壤的研究
Study on the Enhancement of Amaranthus mangostanus in the Remediation of Cadmium Contaminated Soil by Bi-odegradable Chelating Agents GLDA and NTA
摘要
Abstract
Chelating agents can improve the bioavailability of heavy metals in soil and the efficiency of hyperaccumulating plants to absorb and enrich heavy metals.In order to improve the efficiency of Cd extraction from soil by Cd hyperaccumu-lating plants,Amaranthus mangostanus was focused in this study.In addition,the effect of different concentrations of bio-degradable chelating agents,glutamic acid N,N-diacetic acid(GLDA)and nitrilotriacetic acid(NTA)on the enrichment of Cd from soil by Amaranthus mangostanus was investigated through laboratory pot experiment.The results show that addi-tion of 5.0 mmol·kg-1 NTA and 2.5 or 5.0 mmol·kg-1 GLDA could significantly increase the aboveground biomass of Amaranthus mangostanus.when the concentration of Cd in soil was 5 mg·kg-1,and the increment was 44.12％,17.12％and 8.00％,respectively.Both GLDA and NTA could effectively increase the Cd content in the aboveground parts of Ama-ranthus mangostanus.When 5 mmol·kg-1 of GLDA and NTA were added to the soil with Cd concentration of 40 mg·kg-1,Cd concentration in the aboveground parts of Amaranthus mangostanus could reach 100.88 and 63.08 mg·kg-1,which was 2.46 and 1.54 times higher than that without chelating agents,respectively.Moreover,addition of 5 mmol·kg-1 GLDA or NTA was more effective in increasing the Cd content in the aboveground parts of Amaranthus mangostanus compared to 2.5 mmol·kg-1 GLDA or NTA.Applying chelating agents to the soil could effectively increase the total a-mount of Cd enrichment in Amaranthus mangostanus.When applying 5.0 mmol·kg-1 GLDA to a soil with Cd content of 20 mg·kg-1,the total Cd extraction by Amaranthus mangostanus reached the highest point of 613.86 μg·pot-1,which was 1.4 times higher than that without chelating agent addition.Both GLDA and NTA could increase the available Cd con-tent in soil,and promote the absorption and enrichment of Cd from soil Cd by Amaranthus mangostanus compared with NTA and GLDA.It was found that in soil with Cd content of 5 and 10 mg·kg-1,the application of NTA was more effec-tive than GLDA in increasing the total Cd extraction by Amaranthus mangostanus.While in soil with Cd content of 20,30,and 40 mg·kg-1,the application of GLDA was more effective than NTA.This study provides a theoretical basis and refer-ence for improving the efficiency of Cd extraction by hyperaccumulating plants.关键词
超积累植物/镉/谷氨酸N,N-二乙酸(GLDA)/氨三乙酸(NTA)/红苋Key words
hyperaccumulator/cadmium/glutamate N,N-diacetic acid(GLDA)/nitrilotriacetic acid(NTA)/Amaran-thus mangostanus分类
资源环境引用本文复制引用
李张伟,何燕仪..可生物降解螯合剂谷氨酸N,N-二乙酸和氨三乙酸强化红苋修复镉污染土壤的研究[J].生态与农村环境学报,2025,41(4):550-559,10.基金项目
国家自然科学基金(31770584) （31770584）
广东省普通高校特色创新类项目(2021KTSCX073) （2021KTSCX073）
韩山师范学院校级科研项目(XKN202301) （XKN202301）
