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By W. T. Elwell

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Additional resources for Analysis of Copper and its Alloys

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Dissolve 18-6g of EDTA in water, then dilute the solution to 1 litre. BUFFER SOLUTION. Dissolve 50 g of ammonium acetate in about 250 ml of water, add 2-5 ml of glacial acetic acid, then dilute the solution to 500 ml. STANDARD ZINC SOLUTION ( 0 0 5 M). Dissolve 3-269 g of zinc in 60 ml of nitric Y ALUMINIUM 31 acid (1 + 3 ) , boil the solution gently for 1 to 2 minutes to expel oxides of nitrogen, then cool. Dilute the solution to about 100 ml, add ammonia solution until the solution is just alkaline (use litmus paper), add acetic acid (1+1) until the solution is just acid, then cool.

Calculate the aluminium content of the sample, using the factor obtained on the standard copper solution. 4. 1. 1. Special > „ Reagents J EDTA SOLUTION (0*05 M). Dissolve 18-6g of EDTA in water, then dilute the solution to 1 litre. BUFFER SOLUTION. Dissolve 50 g of ammonium acetate in about 250 ml of water, add 2-5 ml of glacial acetic acid, then dilute the solution to 500 ml. STANDARD ZINC SOLUTION ( 0 0 5 M). Dissolve 3-269 g of zinc in 60 ml of nitric Y ALUMINIUM 31 acid (1 + 3 ) , boil the solution gently for 1 to 2 minutes to expel oxides of nitrogen, then cool.

Wash the precipitate about four times with the hot neutral ammonium chloride solution (2 per cent), then transfer paper and precipitate to a tared small platinum dish. Ignite the residue, finally at a temperature of not less than 1100°C, to constant weight. Cover the dish, cool it in a desiccator and re-weigh as quickly as possible. A l 2 0 3 x 0-5291 = A 1 REPRODUCIBILITY: 0Ό5 AT 5 PER CENT LEVEL NOTES. (1) If the solution from the electrolytic determination of copper and/or lead is used, any insoluble residue present after the initial acid treatment of the sample must be recovered.

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