A study on the distribution of plumbum, cadmium on soybeans and deprotonation of carboxyl functional groups of citric acid in the chelation process. This study was deprotonation phase of carboxyl functional groups of citric acid as chelating agent, that was review chemically activity (protons number) functional group of citric acid was caused of chelation environment pH changes. Research factors were 1) ratios of citric acid with water, consists of three levels i.e. 0,1:1; 0,2:1 and 0,3:1 second factors was chelation environment pH, consists of three levels i.e. 5; 7.5 and 10. The results showed that, the plumbum (Pb) accumulation in seed coat tissue average value 0,37 ± 0,03 ppm, whereas Pb on cotyledon tissue average value 0,39 ± 0,07 ppm. Cadmium (Cd) accumulation in seed coat tissue average value was 0,02 ± 0,004 ppm while the Cd on cotyledon tissue average value 0,02 ± 0,003 ppm. The highest deprotonation of functional groups citric acid as chelating agent 9,43cmol+kg was reached on chelation condition citric acid ratios with water 0,3:1 on chelation environment pH 10 (A3B3–1). The study result non significant difference with citric acid ratios with water 0,2:1 and 0,1:1 on chelation environment pH 10.
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