Separation of the non-volatile noble metals by reversed-phase extraction chromatography.
The procedure involves the use of tri-n-butyl phosphate (TBP) adsorbed by Porasil C and stepwise elution with sulphuric acid and hydrochloric acid. The distribution coefficients for the two systems (TBP and hydrochloric acid and TBP and sulphuric acid) and the elution characteristics were studied. A description is given of a procedure applicable to the analysis of prills obtained from the fire assay of platinum-bearing ores.
Chromatographic separation and determination of noble metals in matte-leach residues.
The practical application of various chromatographic methods to the analysis of residues obtained from the leaching of copper-nickel mattes is described. The procedure involves the separation of gold on a TBP-treated Porasil column, the separation of base metals by cation-exchange, the separation of tellurium from platinum-group metals, and the separation of the non-volatile platinum-group metals on one cellulose column.
Measurement of water regain and macropore volume of ion‐exchange resins
Various modifications of the method of centrifuging have been critically studied. The correction for interstitial water is complicated by finite angles of contact, compression of the resin bed, and slow attainment of equilibrium. The use of a non-ionic detergent of high molecular weight has led to a procedure which eliminates errors caused by these effects, and which is convenient and rapid. It can be adapted to the measurement of the volume of macropores in macroporous resins.