Multiwavelength spectral correction for the simultaneous determination of Cu(II), Fe(II), and Zn(II) with 1-(5-bromo-2-pyridylazo)-2-naphthol-6-sulfonic acid

A new analytical method is described for the simultaneous determination of various components by multiwavelength spectrophotometry, Because of the inf luence of the free ligand and various complexes on spectrophotometric absor ption, the spectral correction principle was used to establish the calculat ion matrix formula. The 3 sensitive reactions of Cu(ll), Fe(ll), and Zn(ll) , with 1-(5-buomo-2-pyridylazo)-2-naphthol-6-sulfonic acid were studied at pH 10.5, In analyses of fortified samples, the recoveries of Fe, Zn, and Cu were between 93.0 and 103%, 87.0 and 108%, and 92.5 and 108%, respectively ; the relative standard deviations for 5 determinations of Fe, Zn, and Cu i n unfortified ore were 3.6, 5.8, and 4.5 %, respectively.