Articles written in Proceedings – Section A
Volume 59 Issue 4 April 1964 pp 241-250
2′:4′-Dihydroxy chalcone is a highly sensitive reagent for ferric iron (1:1,50,000) in weakly acid medium. The absorption maximum is at 440 m
Volume 60 Issue 4 October 1964 pp 259-264
The estimation of copper by titration with 2′, 3′, 4′-trihydroxy chalcone was carried out amperometrically. The titranions were performed in 30% aqueous alcoholic media at pH 4·5 and an applied potential of −0·4 v (
Volume 67 Issue 2 February 1968 pp 90-98
1·0–6·0 p.p.m. of germanium could be estimated spectrophoto-metrically with 2′, 3′, 4′-trihydroxy chalcone as reagent at pH 5·8–6·0. The complex was shown to contain three gram-moles of the reagent to one gram-atom of germanium both by Job’s method of continuous variations and the slope ratio method of Harvey and Manning. The instability constant was determined by the method of Edmonds and Birnbaum and found to be 1·670×10−11 at 28° C. It is concluded that complex formation involved only the two ortho hydroxyls in each molecule of the reagent and the carbonyl group played no part.