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  • Title: Spectrophotometric titration of bismuth with EDTA.
    Author: Ramaiah NA, Tewari GD, Trivedi SR, Katiyar SS.
    Journal: Talanta; 1968 Mar; 15(3):352-6. PubMed ID: 18960305.
    Abstract:
    A new spectrophotometnc method for the estimation of bismuth with EDTA, using iron-salicylate complex as the indicator, has been developed. The determinations were carried out by measuring the absorbance at 520 mmu. of solutions containing bismuth, iron(III), salicylic acid and various quantities of EDTA, at pH 0.5. It has been shown from the stability constants of the complexes present that before the end-point iron(III) will not react appreciably with the Bi-EDTA complex. The interference from iron(III) in the estimation of bismuth, which is a serious drawback in many other methods, is eliminated in the present method, as iron(III) acts as the indicator.
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