POLAROGRAPHY RECOMMENDED AS A STANDARD METHOD FOR ESTIMATION OF COPPER, NICKEL AND CHROMIUM IN STEELS

Following published polarographic methods, statistical data were collected for the estimation of copper, nickel and chromium in samples of standard steels (British Chemical Standards) of different composition. This was done to study reliability and reproducibility of the polarographic methods for routine analysis. The results of polarographic estimation were found to be in good agreement with the chemical values reported. (auth) A method was standardised for the fast estimation of uranium in minerals and ores. The sample is dissolved with a mixture of hydrofluoric and nitric acids. After removing fiuoride with repeated nitric acid evaporations, uranium is separated on a paper strip using ethyl acetate or tri-n-butyl phosphate in mineral turpentine as solvent. The estimation is carried out by comparing the colour intensity developed with potassium ferrocyanide with known standards. (auth)