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

By W. T. Elwell

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P . m . m. of bismuth) Measure the wave-height, and calculate the bismuth content of the sample by reference to the wave-height of the control. M. LEVEL NOTE. 7, page 93), the use of nitric acid supplied as "Lead-free For Foodstuffs Analysis'*, or of similar quality, is advised. CHAPTER 9 BORON BORON is sometimes used as a deoxidant for copper, and as much as 0-2 per cent of boron may be present. Several colorimetric reagents have been used for determining [ 9 ]1 small amounts of b o r o n , but a preliminary separation as methyl borate is usually necessary.

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. 2. Special Reagent POTASSIUM BROMATE SOLUTION (001 N). Dissolve 0-2784 g of potassium bromate (dried at 180°C) in water, transfer the solution to a calibrated flask and dilute to 1 litre. Use twice the weight of potassium bromate for a 0-02 Ν solution.

The best way of recovering this aluminium is to fuse the recovered acid-insoluble residue with potassium hydrogen sulphate, extract the cold melt with hot water, and add the extract to the main filtrate. 1. 1. Procedure Aluminium Sample (per cent) (g) 0 1 to 1 1 to 2-5 Above 2-5 5 2 Containing 20 to 50 mg Al Transfer the appropriate weight of sample to a beaker (400 ml), and add 5 ml of cone, nitric acid and 5 ml of cone, hydrochloric acid for each 1 g of sample (Note 1). Warm to assist solution of the sample.

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