The Effect of Different Organic Acids on Existing forms and Bioavailability of Cadmium

In order to reveal the effect of the exudation of organic acids by root on existing forms and bioavailability of Cd2+,the effects of tartaric acid,oxalic acid,malic acid,citric acid,acetic acid and EDTA of different concentrations on existing forms of Cd2+ were studied.The results showed that EDTA was the most beneficial to enhance the activity of Cd2+,and citric acid and acetic acid came second,and effect of malic acid was the worst.When the concentrations of acetic acid and citric acid were one,and three mmol/kg,and the concentrations of EDTA were five,six and seven mmol/kg,the bioavailability would be improved.