Organic azo-dyes in quantitative analysis |
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Authors: | M. R. Zaki and K. Shakir |
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Affiliation: | (1) Atomic Energy Establishment, Cairo |
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Abstract: | Summary Chrom red brown 5RD was used as an indicator for complexometric titration of thorium. The change in the colour at the end-point was from wine-red to yellow. It is recommended that the thorium buffered aliquot should not contain less then 200 g thorium per 10 ml for a precise estimation. A range of pH from 2.5 to 3.5 has been found satisfactory for such a titration. Ferri, ferro and zirconium ions interfere; they should be separated beforehand.Part I: Zaki, M. R., and K. Shakir: Z. analyt. Chem. 174, 274 (1960). |
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