Different-metal complexes of copper-bismuth (zirconium)-citrate and their analytical use

Formation of different-metal complexes of copper and bismuth, copper and zirconium or aluminium with citric acid is investigated. Introduction of the mentioned metal nitrates into solutions of copper citrate results in the latter optical density increase and in the shift of light absorption maximum. The component ratio in the complexes is established using the method of molar ratios and isomolar series. The method of indirected photometric bismuth determination according to increase of optical density of copper citrate solution is developed