2,2',3,4-Tetrahydroxy-3'-sulpho-5'-nitroazobenzene for spectrophotometric determination of aluminium in pharmaceutical suspensions and granite [An article from: Analytica Chimica Acta]

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Description:
A selective and sensitive new spectrophotometric method has been developed for the determination of aluminium. 2,2',3,4-Tetrahydroxy-3'-sulpho-5'-nitroazobenzene (tetrahydroxyazon SN) formed an orange chelate with aluminium at pH 4. Molar absorptivity of the complex in 1:2 is 5.46x10^4lmol^-^1cm^-^1 at 479nm. The method obeys Beer's law in the range of 0.005-1.079@mgml^-^1. The determination of aluminium is not interfered with by earth alkaline, alkaline elements, rare earth elements, halides, phosphates, sulphates, urea, ascorbic acid, Sn^2^+, Sr^2^+, Cr^3^+, Cd^2^+, Hg^2^+, or Mn^2^+. The proposed method is rapid and simple, and it has been successfully applied to the determination of aluminium in certified pharmaceutical suspension and granite.