Abstract
The use of chelators with high biodegradability is a promising strategy to remove potentially toxic elements (PTEs) from soils by washing. The current study investigated the potential of nitrilotriacetic acid (NTA) to remove Cd from Cd-contaminated soil from Iran (calcareous soil, ICd) and Belgium (acidic soil, BCd). Washing tests were carried out with soils artificially contaminated with 2 levels of Cd (20 and 40 mg kg−1), 4 levels of NTA (0, 2, 5, and 15 mmol L−1), different pHs (4, 7, and 10), and different contact times (20, 40, and 60 min). The results showed that the optimal concentrations of NTA were 5 and 2 mmol L−1 for ICd and BCd, respectively. After using NTA5 compared to NTA0, Cd removal at pH 4, 7, and 10 increased by 1, 76, and 80% in ICd20 and 1, 77, and 81% in ICd40, respectively. These values were 46, 53, and 52% in BCd20 and 32, 64, and 62% in BCd40, respectively, after using NTA2. Also, in the first 20 min of the experiment, 95–100% and 75–80% of the maximum extractable Cd were removed from ICd and BCd, respectively. Moreover, NTA extracted a higher percentage of Ca, Fe, Al, Zn, and Cu from BCd compared to ICd (as an exception, the percentage of Ca extracted at pH 4 was higher in ICd compared to BCd). The results showed that the physical/chemical properties of soils affect the washing efficiency and should be taken into account before selecting the type and dose of chelate to remove metals in a given soil.
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Acknowledgements
The authors appreciate the financial and scientific support of the Shahid Chamran University of Ahvaz, Iran, and the Ghent University of Belgium.
Funding
This study was funded by the Research Vice Chancellor of Shahid Chamran University of Ahvaz, Iran (Grant No. SCU.AS99.692), and the New-C-Land Project (Interreg France-Wallonie-Vlaanderen, with the support of the European Regional Development Fund, Grant No. 1.2.294), OVAM, the Province West Flanders, and the Walloon Region.
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Mehrab, N., Chorom, M., Fernandes de Souza, M. et al. Effectiveness of nitrilotriacetic acid (NTA) on cadmium removal in calcareous soil and acidic soil. Arab J Geosci 16, 622 (2023). https://doi.org/10.1007/s12517-023-11745-y
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DOI: https://doi.org/10.1007/s12517-023-11745-y