Effect of EDTA and NTA on Arsenic Bioaccumulation and Translocation Using Phytoremediation by Mimosa pudica L. from Contaminated Soils
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This study aimed to investigate the effects of Nitrilotriacetic acid (NTA) and Elthylenediaminetetraacetic acid (EDTA) on the bioaccumulation and translocation of arsenic (As) by Mimosa pudica L. using soils with 5 mg/kg of added As and NTA and EDTA concentrations of 50, 100, and 200 mg/kg. Soil and plant samples were collected every 30–120 days to analyze the As concentrations in the soil, underground part of the plants (root), and aboveground parts of the plants (shoots and leaves). The results showed that the plants with EDTA concentrations of 100 mg/kg had the highest As accumulation. At 120 days, M. pudica L. had a higher accumulation in the underground parts (29.71 mg/kg) than in the aboveground parts (6.32 mg/kg), with statistical significance (p < 0.05). The As translocation factor in the aboveground parts was less than 1, indicating As accumulation in the underground part only. With EDTA concentrations of 50 and 100 mg/kg, M. pudica L. had the highest bioaccumulation potential of As of 8.00 and 8.44, respectively. However, this research did not examine the reaction between As and any growth promoters. Further research should investigate the details of such a reaction at the molecular level, as well as explore how fertilizer factors might affect the As absorption of M. pudica L.
KeywordsPhytoextraction Mimosa pudica L. Accumulation Chelating agent Arsenic
The authors would like to thank the Office of Higher Education Commission (OHEC) and the S&T Postgraduate Education and Research Development Office (PERDO) for the financial support of the Research Program and the Ratchadaphiseksomphot Endowment Fund, Chulalongkorn University Research Unit. We also express our sincere thanks to the Environmental Research Institute, Chulalongkorn University (ERIC), the Center of Excellence on Hazardous Substance Management (HSM) and the Synchrotron Light Research Institute (SLRI) for their invaluable support in terms of facilities and scientific equipment.
Authors participated in all experiments, coordinated the data-analysis and contributed to the written text of this manuscript.
Compliance with Ethical Standards
Conflict of interest
The authors declare no conflicts of interest.
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