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

By W. T. Elwell

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541 Whatman paper (9 cm); wash the mercury and paper with warm water. T o the filtrate, add, and dissolve, 0-25 g of E D T A , followed by ammonia solution (stir continuously), until a permanent precipitate is formed, then add 10 ml of ammonia solution in excess. Allow the solution to stand at room temperature for 3 hours or, preferably, overnight. Filter off the precipitate on to a N o . 40 Whatman paper, and wash the paper and precipitate with ammonium nitrate solution (2 per cent)—neutral to methyl-red solution; transfer final traces of precipitate from the beaker with the aid of a little paper pulp and a rubber-tipped glass rod; discard the filtrate.

REPRODUCIBILITY: 0 0 0 3 AT 0Ό4 PER CENT LEVEL FOR ALUMINIUM CONTENTS 0 0 4 to 0 4 PER CENT. 3, up to the stage where the solution is diluted to 250ml in a calibrated flask. Transfer a 25-ml aliquot o f this solution to a 100-ml calibrated flask, and dilute to the mark. Transfer a 10-ml aliquot to a 100-ml calibrated flask, add 4 ml of sulphuric acid ( 1 + 1 0 ) , dilute to about 25 ml, add 2 ml o f thioglycollic acid ( 1 + 2 5 ) , then continue as described under Preparation of Calibration Graph.

41 Whatman paper (9 cm) into a dry 1-cm cell, and immediately measure the optical density at a wavelength of 553 ηιμ. 3. Procedure. Transfer 0-1 g of the sample (Note) to a beaker (50 ml), add 5 ml of cone, hydrochloric acid and 1 ml of cone, nitric acid, then continue as described under Preparation of Calibration Graph. Calculate the antimony content of the sample, using the calibration graph. REPRODUCIBILITY: 0-002 AT 0 0 2 PER CENT LEVEL NOTE. This weight of sample is suitable for antimony contents up to about 0-025 per cent.

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