Simultaneous determination of iron(III) and total iron by flow injection analysis using kinetic spectrophotometry with tiron

Abstract

Two flow injection analysis systems have been developed for the simultaneous spectrophotometric determination of iron(III) and total iron using Tiron as the colour developing reagent. The first system uses a single detector with two flow cells aligned with the same optical path to yield two peaks corresponding to iron(III) and total iron in the sample. The sample through put is high (60 samples h–1) with a precision of 0.35% for iron(III) and 0.55% for total iron. The second system is a multi-detection system which allows 30 samples to be analysed per hour with the advantage of much simpler instrumentation.