Complexometric estimation of thorium |
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| Authors: | Balwant Singh and M S Mankotia |
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| Institution: | (1) Chemistry Department, Panjab University, India |
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| Abstract: | Summary Thorium has been determined by titration with EDTA (disodium salt) solution as complexometric reagent at pH 3–4.5 using a drop of 0.01 M iron(III) solution mixed with thiocyanate-p-anisidine as indicator. Calcium, barium, strontium, magnesium or manganese ions do not interfere, but zinc, zirconium, lead, silver, aluminium, bismuth, phosphate, fluoride or oxalate ions interfere in this estimation. In these complexometric titrations the quantitative results obtained by using a drop of iron(III) solution mixed with thiocyanate-p-anisidine as indicator are comparable with those obtained with pyrocatechol violet indicator.
Zusammenfassung Thorium wird bei pH 4–4,5 mit ÄDTA titriert, wobei ein Gemisch eines Tropfens Eisen(III)-lösung mit Thiocyanat-p-Anisidinlösung als Indicator dient. Calcium, Barium, Strontium, Magnesium oder Mangan verursachen keine Störung, wogegen folgende Ionen stören: Zink, Zirkonium, Blei, Silber, Aluminium, Wismut, Phosphat, Fluorid oder Oxalat. Der erwähnte Mischindicator liefert ähnlich genaue Titrationsergebnisse wie bei Verwendung von Brenzcatechinviolett als Indicator.
The authors take this opportunity to thank the Council of Scientific and Industrial Research (India) for the award of Junior Fellowship to one of them (junior author). This has enabled us to pursue the study of complexometric titrations. |
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