The photometric determination of traces of aluminium in zinc

Abstract

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.

Direct Photometric Determination of Aluminum in Iron Ores

“…The x-ray diffraction powder patterns of 15 calcium phosphates are reported. The monocalcium and dicalcium orthophosphates used as starting materials were of commercial origin.…”

“…The shortcomings of the usual phosphate gravimetric procedure for aluminum in iron ores have been pointed out by Saxer and Jones {18). Numerous photometric methods have been described {9, 10, 15,16), but tedious and time-consuming separations of iron and other interfering elements make these procedures unattractive for routine use.…”

“…Chenery (1) employed thioglycollic acid in an aurintricarbo.xylic acid method for aluminum, but limited his study to the interference of iron, magnesium, and phosphorus. Chenery's method has been applied to the determination of aluminum in bronzes and other nonferrous alloys by Sherman (30), Luke and Braun (11), and Pellowe and Hardy (15). The earlier work of Richter (16,17) with thioglycollic acid has been overlooked by Chenery (1) and others.…”

Separation and determination of small quantities of aluminum in steel

“…The recommended aluminon photometric procedure has been described by Pellowe and Hardy [ 10 ]. The optimum amount of aluminum in the final aliquot is between 0.02 and 0.30 mg.…”