Titrimetric determination of aluminium in zinc-aluminium alloys, with edta and a cu(II)-selective electrode.
The end-point for the titration of EDTA with Cu(II), as measured by a Cu(II)-selective electrode, varies with pH and temperature. Moreover, the effect of pH and temperature on the behaviour of this electrode differs according to whether fluoride is present. As a consequence, the determination of aluminium in zinc-aluminium alloys by the Freegarde and Allen method with use of a Cu(II)-selective electrode must be performed with close control of pH and temperature to maximize accuracy and repeatability.
Steger
H F
HF
Mineral Sciences Division, Canada Centre for Mineral and Energy Technology, 555 Booth Street, Ottawa, Canada.