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Evaluation of modified chitosan for remediation of zinc contaminated soils

Evaluation of modified chitosan for remediation of zinc contaminated soils

Tripathi, Nimisha, Choppala, Girish and Singh, Raj S. (2016) Evaluation of modified chitosan for remediation of zinc contaminated soils. Journal of Geochemical Exploration, 182 (B). pp. 180-184. ISSN 0375-6742 (Print), 1879-1689 (Online) (doi:https://doi.org/10.1016/j.gexplo.2016.08.011)

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Abstract

This study evaluated the effects of pure and modified chitosan beads on the remediation of zinc (Zn) polluted soils and estimated the bioavailability of Zn for Indian mustard plants. The soil was spiked with 0 to 400 mg kg−1 of Zn and subsequently amended with pure chitosan beads (PCB) and chitosan beads modified with molybdenum (MoCB), iron (ICB), single super phosphate (SSPCB) and mono calcium phosphate (MCPCB). Compared to the non-amended soils, chitosan bead amended soils had greater plant biomass, reduced plant metal uptake and increased immobilisation of Zn in soil and pore water. Shoot uptake of Zn decreased the most in MoCB amended soil, and least in PCB amended soil relative to unspiked soil. The decrease in plant Zn uptake and enhanced Zn immobilisation may be attributed to Zn complexation by modified chitosan beads with high surface area and cation exchange capacity (CEC). The application of modified chitosan beads to Zn contaminated soil could significantly decrease Zn bioavailability and toxicity.

Item Type: Article
Uncontrolled Keywords: chitosan, zinc, contamination, soil, immobilisation, remediation
Subjects: Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > School of Engineering (ENN)
Last Modified: 22 Oct 2019 12:24
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/25482

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