Effect of citric acid and EDTA on chromium and nickel uptake and translocation by Datura innoxia

• Published in: Environmental pollution (1987) 2008-06, Vol.153 (3), p.555-563
• Main Authors: Jean, Liliane, Bordas, François, Gautier-Moussard, Cécile, Vernay, Philippe, Hitmi, Adnane, Bollinger, Jean-Claude
• Format: Article
• Language: English
• Subjects: Analytical chemistry; application rate; Applied sciences; Biodegradation, Environmental; Biological and medical sciences; Biotechnology; Chelant; Chelating Agents; Chemical Sciences; Chromium; Chromium - analysis; Chromium - metabolism; Citric Acid; Contaminated soil; Datura - metabolism; Datura innoxia; Datura inoxia; Decontamination. Miscellaneous; Earth sciences; Earth, ocean, space; Edetic Acid; EDTA (chelating agent); Engineering and environment geology. Geothermics; Environment and pollution; Environmental Restoration and Remediation - methods; Environmental Sciences; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; heavy metals; hyperaccumulators; Industrial applications and implications. Economical aspects; Industrial Waste; Inorganic chemistry; metal tolerance; Miscellaneous; Mobilization; Nickel; Nickel - analysis; Nickel - metabolism; plant physiology; Plant Roots - chemistry; Plant Shoots - chemistry; Pollution; Pollution, environment geology; Soil and sediments pollution; Soil Pollutants - analysis; Soil Pollutants - metabolism; solubilization; Translocation; translocation (plant physiology); uptake mechanisms
• ISSN: 0269-7491; 1873-6424
• DOI: 10.1016/j.envpol.2007.09.013

EDTA and citric acid were tested to solubilize metals and enhance their uptake by Datura innoxia, chosen because of its ability to accumulate and tolerate metals. Two application modes were used on an industrial soil contaminated mainly by Cr and Ni. The results showed that citric acid was the most effective at increasing the uptake of Cr and EDTA for Ni. These results are consistent with the effectiveness of both chelants in solubilizing metals from the soil. The translocation factor (TF) of Ni was 1.6- and 6.7-fold higher than the control, respectively, for one and two applications of 1 mmol kg −1 EDTA. After two applications of 5 and 10 mmol kg −1 citric acid, the TF of Cr increased 2- and 3.5-fold relative to the control. Whatever the concentration, the application of EDTA modified the plant physiology significantly. For citric acid this was only observed with the highest dose (10 mmol kg −1). Chelant effectiveness in increasing chromium and nickel uptake by Datura innoxia is the result of the increase in translocation versus negative effect on plant physiology.