Colorimetric determination of copper, nickel and cobalt in their respective soaps

Summary The metal ion content of heavy metal soaps can be successfully determined colorimetrically using their dilute solutions in pyridine. Measurements with copper and nickel soaps (myristates and palmitates) could be carried out at 675 and 650 nm respectively, those for the corresponding cobalt soaps (myristate and palmitate) at 550 nm.

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Zusammenfassung Der Metallgehalt von Schwermetallseifen kann mit gutem Erfolg colorimetrisch bestimmt werden, wenn man die verdünnte Lösung der Substanz in Pyridin verwendet. Messungen an Kupfer- und Nickelseifen (Myristate und Palmitate) wurden bei 675 bzw. 650 nm, an Kobaltseifen (ebenfalls Myristat und Palmitat) bei 550 nm durchgeführt.

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Thanks are due to Prof. A. R. Kidwai for providing facilities and to the Council of Scientific and Industrial Research, India for the award of a fellowship to one of us (R. H.) to carry out this work.