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Assessment of biodegradable chelating agents in the phytoextraction of heavy metals from multiemetal contaminated soil

Diarra, Ivan and Kotra, Krishna K. and Prasad, Surendra (2020) Assessment of biodegradable chelating agents in the phytoextraction of heavy metals from multiemetal contaminated soil. Chemosphere, 2020 . pp. 1-14. ISSN 0045-6535

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    A pot incubation experiment under natural conditions was designed to investigate the effects of three biodegradable chelating agents, namely; the [S,S]-isomer of ethylenediamine disuccinate (EDDS), citric acid (CA), and tetrasodium N,N-Bis(carboxymethyl)-L-glutamate acid (GLDA), on two plant species (Brassica juncea and Brassica rapa) in terms of plant foliar growth, dry matter yield, and heavy metal (HM) accumulation. Both plant species exhibited diminished growth and symptoms of phytotoxicity under HM stress. The application of EDDS and CA affected plant foliar growth, biomass production, and led to the development of chlorotic lesions on leaves. EDDS and CA also decreased the shoot length by 38.5% and 45.2% in B. juncea, and 60.1% and 100% in B. rapa, respectively. In contrast, GLDA relieved HM stress by significantly increasing plant growth (P > 0.05) and was shown to be well tolerated (tolerance index [TI]; B. juncea ¼ 99% and B. rapa ¼ 123%). Among both plants, B. juncea displayed the ability to accumulate a wider range of HMs at higher concentrations. Amongst the three chelators, EDDS induced the highest bioconcentration (BCF) of Pb (2.45), Zn (2.68), and Cd (3.36) while CA achieved better results for Ni (4.01) and Cr (1.45). However, the current results showed that even with the application of chelating agents, HMs were predominantly accumulated in roots and translocation factor was generally <1. The findings of this investigation emphasize that chelateeassisted phytoextraction with Brassica spp. is highly limited in multiemetal settings, making it an unsuitable option for severely contaminated sites.

    Item Type: Journal Article
    Uncontrolled Keywords: Phytoextraction, Remediation, Heavy metals, Biodegradable chelating agents, Pacific Islands
    Subjects: Q Science > QD Chemistry
    S Agriculture > S Agriculture (General)
    Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
    Depositing User: Krishna Kotra
    Date Deposited: 15 Nov 2020 17:55
    Last Modified: 18 Nov 2020 12:08

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