Evaluation method for the measuring comprehensive suitability of chelating agents: a study of the temporal dynamics of heavy metal activation. Issue 14 (6th December 2019)

• Record Type: Journal Article
• Authors: Mai, Xiaotao; Luo, Dinggui; Wei, Lezhang; Liu, Yu; Huang, Xuexia; Wu, Qihang; Yao, Guangchao; Liu, Guowei; Liu, Lirong
• Is Part Of: International journal of phytoremediation. Volume 21:Issue 14(2019)
• Page Start: 1415
• Page End: 1422
• Publication Date: 2019-12-06
• Subjects: Dynamic activation experiment -- Cd -- Chelating agent -- comprehensive suitability -- Pb -- phytoextraction; Phytoremediation -- Periodicals; 628.5
• DOI: 10.1080/15226514.2019.1633262
• Languages: English
• ISSNs: 1522-6514

Abstract

Abstract: The effects of chelating agents on heavy metal activation in Cd- and Pb-contaminated soils were studied through a dynamic activation experiment. An evaluation method for the measuring comprehensive suitability of chelating agent was established by calculating indexes for the degree of activation effect suitability and activated heavy metals' half-life suitability. The following results were obtained: in Cd- and Pb-contaminated soils, heavy metal activation effects reached or approached maximum activating effects within 1 d and subsequently showed different levels of decline in all chelating agent treatment conditions. Declines in activation effects similarly subjected to the law of exponents over time and to the goodness of fit in DTPA, NTA, and GLDA ranged from 0.80 to 0.98. For Cd- and Pb-contaminated soils, chelating agents' levels of comprehensive suitability ( H ) were recorded as follows: NTA(1.40) > GLDA(1.31) > DTPA(1.14) > EDTA(1.00) > EDDS(0.14) > CA(0.06) and GLDA(1.56) > DTPA(1.48) > EDTA(1.00) > NTA(0.78) > EDDS(0.26) > CA (0.02). GLDA and DTPA are both suitable for Cd and Pb phytoextraction. Moreover, NTA and GLDA are optimal chelating agents for Cd and Pb phytoextraction, respectively.