Tatsuhiko Tanaka, K. Hotta, T. Yoshimori
Mar 1, 1980
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0
Influential Citations
4
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The purity of recrystallized disodium dihydrogen ethylenediaminetetraacetate dihydrate was determined accurately by titration with zinc ion coulometrically generated from an amalgamated zinc anode. The reagents used were of 99.446% ±0.002% homogeneity when the sample was dehydrated and stored in a hygrostat (relative humidity, ca. 58% at 20 °C) over 1 year. Aluminium of high purity (99.99%) was coulometrically titrated with the purified reagent. Aluminium was allowed to react with a certain amount of the reagent, excess of the reagent being titrated with zinc ion anodically generated. The end point was determined potentiometrically using a mercury electrode. The purity was found to be 99.976% with a standard deviation of 0.010% for 6 degree of freedom. Cause of the lower result (0.01%) is discussed.