A rapid method is described for the quantitative determination of from 0*001 to 0.01 per cent. of aluminium by means of aluminon. Thioglycollic acid is used as a complexing agent to suppress interference from iron, copper and tin; the pH a t the time of colour development is controlled by the use of a buffer solution. Data pertaining to interference from other metals are given and the method can be modified for the determination of aluminium in certain tin and cadmium-base alloys.
A rapid chemical method is describsed for the analysis of galvaniser's ash or other zinc residues containing metallic zinc, zinc oxide and zinc chloride.The zinc residue is shaken with ammonium acetate solution to dissolve zinc oxide and chloride. Zinc chloride is determined by titration with silver nitrate ; zinc oxide plus chloride is determined by titration with potassium ferrocyanide in presence of sulphuric acid and the amount of zinc oxide is given by difference between the two determinations, Metallic zinc is determined on the residue from the dissolution stage.
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