Water-soluble pyridylazoaniline reagents for the spectrophotometric determination of metals

Add time:07/23/2019    Source:sciencedirect.com

Three water-soluble pyridylazoaniline reagents were synthesized and their application as spectrophotometric reagents for iron(II), copper(II), nickel(II) and cobalt(III) was investigated. Of the three reagents, 2-(5-bromo-2-pyridylazo)-5-(N-propyl-N-sulfopropylamino)aniline (5-Br-PSAA) was found to be very sensitive (ϵ = 8.9 × 104 l mol−1 cm−1 at 558 nm, pH 4.3) and selective for iron(II). The iron(II) complex has a 1:2 metal/reagent ratio and, once formed, is not decomposed by EDTA, whereas the copper(II) and nickel(II) complexes are readily decomposed by EDTA. Thus, 5-Br-PSAA is useful for the determination of traces of iron(II) in biological samples, and is successfully applied to blood serum. The reagent is four times more sensitive than bathophenanthroline for iron(II). High sensitivity is also obtained for cobalt(III) in 3 M hydrochloric acid.

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