Download PDF by W. T. Elwell: Analysis of Copper and its Alloys

By W. T. Elwell

ISBN-10: 0080121608

ISBN-13: 9780080121604

Show description

Read Online or Download Analysis of Copper and its Alloys PDF

Similar social sciences books

Additional info for Analysis of Copper and its Alloys

Example text

Recovered arsenic is oxidised to the pentavalent state, then determined absorptiometrically, following reduction of arsenomolybdate to molybdenum-blue. m. of arsenic in copper, bronze or cupro-nickel. 1. Distillation/ Volumetric 1. 2. 3. 4. 1. Apparatus. The distillation apparatus (see Fig. 1) comprises: Resistance-glass Erlenmeyer flask (500 ml) with a B24 socket Still head with BIO and B24 cones Thermometer (110°C) with a BIO cone Receiver-beaker or flask (500 ml). FIG. 1. Schematic outline of apparatus for determining arsenic.

The procedure is applicable to most copper-base alloys; interference from beryllium is eliminated if an excess of ammonium benzoate is present. 3 is a direct volumetric method for the determination of aluminium in many alloys ; it is based on a method first proposed [ 4 ]7 [ 4 8] by S a j o , and later described by Freegarde and A l l e n . A slight excess of EDTA is added to a solution of the sample, followed by the addition of a standard copper solution to combine with the excess of E D T A .

Transfer the solution to a mercury-cathode cell, and electrolyse at 5 amp for about 1 hour, or until the electrolyte is colourless (Note 2). Rinse the cover-glass and inside of the beaker with water, and continue the electrolysis for a further 15 minutes. Remove the electrodes from the solution (wash the electrodes with water at the same time), and filter the solution, without delay, through a fluted N o . 541 Whatman paper (9 cm); wash the mercury and paper with warm water. T o the filtrate, add 10 g of ammonium chloride and a small amount of filter-paper pulp, then make the solution just ammoniacal to methyl-red.

Download PDF sample

Analysis of Copper and its Alloys by W. T. Elwell


by Charles
4.2

Rated 4.15 of 5 – based on 8 votes

Published by admin