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Spectrophotometric determination of trace amounts of iron(III) by extraction of mixed-ligand iron-tartrate-purpurin or iron-NTA-purpurin complex

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Spectropbotometric Determination of Trace Amounts of Iron(III) by Extraction of Mixed-Ligand Iron-Tartrate-Purpurin or Iron-NTA-Purpurin Complex

A selective method is described for the determination of microgram amounts of iron(III) by means of its reaction at pH 9.0 with purpurin (1,2,4-trihydroxyanthraquinone) and tartrate or NTA and extraction into methyl isobutyl ketone. The molar absorptivity of the 1∶1∶2 iron(III)-auxiliary ligand-purpurin complex is 4.8×104 1·mole−1·cm−1 at 595 nm. Beer's law is obeyed from 0.05 to 0.25 ppm of iron in the aqueous phase. Procedures for determination of iron in tartrate or NTA medium, and fluoride-tartrate-NTA medium are given. The method is suitable for determining iron in Zn metal, W metal, NTA, drinking water, wines, urine and tartrates.

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Authors and Affiliations

  1. Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Granada, Spain

    F. Capitán, A. Arrebola Ramírez & C. Jimenez Linares

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  1. F. Capitán
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  2. A. Arrebola Ramírez
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  3. C. Jimenez Linares
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Capitán, F., Arrebola Ramírez, A. & Jimenez Linares, C. Spectrophotometric determination of trace amounts of iron(III) by extraction of mixed-ligand iron-tartrate-purpurin or iron-NTA-purpurin complex. Mikrochim Acta 87, 197–207 (1985). https://doi.org/10.1007/BF01197001

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  • DOI: https://doi.org/10.1007/BF01197001

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