BS 576-2-1988 pdf download.Acetic acid for industrial use — Part 2: Methods of test for acetic acid.
6 Determination of residue on evaporation on a water bath Determine the residue on evaporation by the method described in BS 4524.
7 Determination of iron content
7.1 General Determine the iron content by the method described in BS 6337-3 using a 50 mL aliquot portion of a test solution prepared as described in 7.2. Calculate the result from the equation given in 7.3.
7.2 Test portion and preparation of the test solution Weigh, to the nearest 0.001 g, 40 g of the laboratory sample and transfer this test portion quantitatively to a 100 mL one-mark volumetric flask containing about 40 mL of water. Dilute to the mark and mix.
8.2.3 Silver nitrate, 50 g/L solution.
8.2.4 Standard chloride solution, containing 0.1 g of Cl – per litre. Transfer 28.2 mL of a standard volumetric hydrochloric acid solution, c(HCl) = 0.1 mol/L, to a 1 000 mL one-mark volumetric flask, dilute to the mark with water and mix. 1 mL of this solution contains 0.1 mg of Cl – . 8.3 Apparatus Ordinary laboratory apparatus together with the following. 8.3.1 Filter papers, chloride-free.
8.3.2 Two matched Nessler cylinders, graduated at 100 mL.
8.4 Procedure 8.4.1 Test portion. Weigh (M± 0.01 M) g of the laboratory sample, where the value of M depends on the limit set for the inorganic chlorides content, x % (m/m), and is given in Table 2.
9 Limit test for inorganic sulphates 9.1 Principle The turbidity obtained by adding a barium chloride solution to a test solution, acidified with hydrochloric acid, and the turbidity obtained from a sulphate solution, of known concentration, treated in the same manner are visually compared. 9.2 Reagents 9.2.1 General. Use only reagents of recognized analytical grade and only water complying with grade 3 of BS 3978. 9.2.2 Sodium carbonate, 53 g/L solution of the anhydrous salt. 9.2.3 Hydrochloric acid, 36.5 g/L solution of hydrogen chloride.
9.2.4 Barium chloride dihydrate, 100 g/L solution. 9.2.5 Standard sulphate solution, containing 0.1 g of SO 4 2– per litre. Transfer 20.8 mL of a standard volumetric sulphuric acid solution, c(1/2 H 2 SO 4 ) = 0.1 mol/L, to a 1 000 mL one-mark volumetric flask. Dilute to the mark with water and mix. 1 mL of this solution contains 0.1 mg of SO 4 2– . 9.3 Apparatus Ordinary laboratory apparatus together with the following. 9.3.1 Filter papers, sulphate-free.
9.3.2 Two matched Nessler cylinders, graduated at 100 mL. 9.4 Procedure 9.4.1 Test portion. Weigh (M± 0.01 M) g of the laboratory sample, where the value of M depends on the limit set for the inorganic sulphates content, y % (m/m), and is given in Table 3.
BS 576-2 pdf download.