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W. T. Elwell's Analysis of Copper and its Alloys PDF

Posted On March 15, 2018 at 10:37 pm by / Comments Off on W. T. Elwell's Analysis of Copper and its Alloys PDF

By W. T. Elwell

ISBN-10: 0080121608

ISBN-13: 9780080121604

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Preparation of Calibration Graph (Note). Add, separately, 0-5,1-0, 1-5, 2Ό, 3 0 and 4 0 ml of the standard aluminium solution (1 ml = 0 0 1 mg Al) to six 100-ml calibrated flasks. A d d to each (and a blank), 1-5 ml of copper sulphate solution ( l m l Ξ 1-0 mg Cu), and dilute each solution to about 25 ml. Proceed with each solution as follows : Add 2 ml of thioglycollic acid ( 1 + 2 5 ) and 15Ό ml of the aluminonbuffer composite solution, then stand the flask in boiling water for exactly 5 minutes.

Filter the solution through a filter pad, and wash the residue with sulphuric acid (1 + 2 0 0 ) . Ignite the pad and residue in a small platinum dish, cool, add about 0-5 ml of sulphuric acid ( 1 + 1 ) and 2 to 3 ml of hydrofluoric acid ( 1 + 1 ) , evaporate the solution to dryness, then cool the dish. Fuse the residue with 2 g of potassium hydrogen sulphate, cool, dissolve the melt in water and add the extract to the original filtrate. Dilute the solution to about 100 ml, transfer to a mercury-cathode cell, and electrolyse at 5 amp until the electrolyte is colourless (about 1 hour).

Proceed with each solution as follows : Add 2 ml of thioglycollic acid ( 1 + 2 5 ) and 15Ό ml of the aluminonbuffer composite solution, then stand the flask in boiling water for exactly 5 minutes. Remove the flask from the water-bath, cool to room tempera- 33 ALUMINIUM ture, then transfer to a cold-water bath ( 2 0 ± 2 ° C ) for 20 minutes. Dilute the solution to the mark, and measure the optical density at a wavelength of 545 ηιμ, using 2-cm cells. 3. Procedure {Note). Simultaneously determine a blank on the reagents.

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


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