Louis E. Hibbs

The coulometric determination of sulfur in silicon-iron

Abstract A coulometric method for the determination of sulfur in metallurgical products has been developed which meets the needs of production control of low sultur contents. The method is rapid and more precise than the conventional combustion technique.

The determination of aluminium, titanium and nickel in their alloys

Abstract An ion-exchange method for the separation of aluminium, titanium, and nickel is described. Aluminium, titanium and nickel are absorbed on a cation-exchange column which is coupled with an anion-exchange column. A 0.8M hydrofluoric-0.06M hydrochloric acid mixture elutes aluminium from both columns, transfers titanium to the second column and leaves nickel in the first column. The method, which is applied to a permanent magnet alloy, also gives an improved ion-exchange method for the separation of mixtures of nickel, aluminium, cobalt, copper and iron which eliminates a preliminary separation of copper. A metalfluorechromic indicator is used to facilitate the titration of an excess of EDTA for the determination of those elements which form highly coloured complexes.

Determination of nickel in gold-nickel alloys

Abstract An ion exchange separation based on the difference in adsorption from a chloride solution combined with an EDTA titration is suggested as a rapid and accurate method for the determination of nickel in nickel-gold alloys.

The determination of cobalt in cobalt-platinum alloys

Abstract The separation and analysis of cobalt-platinum alloys by ion exchange or hydrazine reduction are superior to the usual techniques of hydrogen sulfide precipitation or base metal reduction. Cobalt is determined by controlled potential electrodeposition.

The determination of copper with triethylenetetramine using a metalfluorechromic indicator

Abstract Triethylenetetramine (trien) has been applied as a selective titrant for the determination of copper without separations or masking of many elements normally found in brasses and bronzes. The application of a metalfluorechromic indicator has made possible the use of trien for the determination of macro amounts of copper without resort to an instrumental end-point detection method. Calcein W serves as a selective indicator for copper in the presence of many elements normally found in brasses and bronzes.