Determination of total iron in ground waters and multivitamin tablets using a solid-phase reactor with tiron immobilised on amberlite ion-exchange resin in a flow injection system |
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Authors: | J F van Staden and L G Kluever |
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Institution: | (1) Department of Chemistry, University of Pretoria, Pretoria 0002, South Africa e-mail:JvStaden@Scientia.up.ac.za, ZA |
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Abstract: | A method is described for the flow injection determination of total iron as Fe(III) using a solid-phase reactor containing
disodium-1,2-dihydroxybenzene-3,5-disulphonate (tiron) as substrate. The iron(III) reacted with tiron to form a complex which
absorbs strongly at 667 nm, where it was measured spectrophotometrically. The system has a linear range of 1 to 50 mg L–1 with a detection limit of 0.67 mg L–1. It is suitable for the determination of total iron in multivitamin tablets and iron-rich ground waters, with a relative
standard deviation of better than 1.1%. The results obtained compared favourably with the certified values and a standard
ICP-AES method.
Received: 12 November 1997 / Revised: 9 March 1998 / Accepted: 15 March 1998 |
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