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“ EDTA and 1 and 10% citric acid showed decreasing effectiveness with time, and the decrease was significant for citric acid at both concentrations (P < 0.001).”
“The results indicated that the removal rate of the heavy metals decreased in the order of Zn > Ni > Cd > Pb > Cu > Cr, when EDTA was used in conjunction with citric acid and glutamic acid.”
Environmental Science and Pollution Research • 2016 | View Paper
“The result shows that in Cr-contaminated soil, the application of EDTA + citric acid significantly (p < 0.05) decreased the shoot dry matter of M. sativa by 55 % and, as such, decreased the Cr removal potential from the soil.”