Determination of iron in aluminium and nickel metals, non-ferrous alloys, feldspar and Portland cement using morin and Triton X-100

Abstract

A simple and rapid spectrophotometric method for the determination of iron in aluminium and nickel metals, non-ferrous alloys, feldspar and Portland cement is described. The procedure is based on the formation of an iron(III)-morin-Triton X-100 ternary complex at pH 2.6–4. The ternary complex has a molar absorptivity of 6.15 × 10⁴ l mol^–1 at 418 nm. The system adheres to Beer's law up to 1.1 µg ml^–1 of Fe and Sandell's sensitivity is 0.0009 µg cm^–2 of Fe. The effect of morin and Triton X-100 concentrations, pH, standing time, foreign ions and stoicheiometry are evaluated. The results of the analyses of some synthetic mixtures and standard samples are reported.