Determination of citrate as its iron(III) complex by differential pulse polarography.

A method for determining citrate as its complex with iron(II1) by differential pulse polarography is described. The method is sensitive to 5 pg ml-1 of citrate, without any interference from equimolar propan-2-onedicarboxylate and propenetricarboxylate ions and 10% of oxalate and tartrate ions. The limits of error in citrate concentrations determined by the proposed method are better than &2.6y0. The feasibility of determining oxalate, succinate and tartrate by means of differential pulse polarography was also explored and the method was found to be applicable to the determination of oxalate.