3.REAGENTSU.K.
All reagents must be of recognized analytical reagent grade, and in particular, free of lead. The water used must be doubly distilled using borosilicate glass apparatus, or water of a similar purity.
3.1.85 % phosphoric acid (ρ20 = 1,71 g/ml).U.K.
3.2.Phosphoric acid solution obtained by diluting 8 ml of phosphoric acid with water to 100 ml.U.K.
3.3.Nitric acid (ρ20 = 1,38 g/ml).U.K.
3.4.Lead solution at 1 g per litre.U.K.
Use a standard commercial grade solution. This solution may be obtained by dissolving 1,600 g of lead (II) nitrate, Pb(NO3)2 in nitric acid diluted to 1 % (v/v) and made up to one litre. Keep the solution in a borosilicate glass bottle with a ground glass stopper.