1 - AS/NZS 1050.14:1994 METHODS FOR THE ANALYSIS OF IRON AND STEEL - DETERMINATION OF MANGANESE IN IRON AND STEEL-TITRIMETRIC METHOD
4 - PREFACE
4 - CONTENTS
5 - 1 SCOPE
5 - 2 REFERENCED DOCUMENTS
5 - 3 PRINCIPLE
5 - 4 REAGENTS
5 - 4.1 General requirements
5 - 4.2 Solutions
5 - 4.2.1 Sulfuric acid (r20 1.84 g/mL)
5 - 4.2.2 Sulfuric acid (500 mL/L)
5 - 4.2.3 Sulfuric acid (150 mL/L)
6 - 4.2.4 Sulfuric acid (50 mL/L)
6 - 4.2.5 Sulfuric acid (25 mL/L)
6 - 4.2.6 Ammonium hydroxide solution (500 mL/L)
6 - 4.2.7 Hydrochloric acid (r20 1.18 g/mL)
6 - 4.2.8 Nitric acid (r20 1.42 g/mL)
6 - 4.2.9 Sulfurous acid solution
6 - 4.2.10 Zinc oxide suspension
6 - 4.2.11 Phosphoric acid-sulfuric acid mixture
6 - 4.2.12 Ammonium persulfate solution (125 g/L)
6 - 4.2.13 Ammonium iron(II) sulfate solution (approx. 20 g/L)
6 - 4.2.14 Silver nitrate solution (10 g/L)
6 - 4.2.15 Potassium dichromate solution (0.008 334 mol/L)
6 - 4.2.16 Preoxidized sodium diphenylamine sulfonate solution (3.2 g/L)
7 - 5 APPARATUS
7 - 6 SAMPLING
7 - 7 PROCEDURE
7 - 7.1 Number of determinations
7 - 7.2 Blank test
7 - 7.3 Check test
7 - 7.4 Dissolution of sample
8 - 7.5 Removal of interfering elements
8 - 7.6 Determination of manganese content
9 - 7.7 Standardization of ammonium iron(II) sulfate solution
9 - 8 CALCULATIONS
9 - 9 PRECISION
10 - 10 ACCEPTANCE OF ANALYTICAL VALUES
10 - 10.1 Single test sample
10 - 10.2 Replicate determinations
11 - 10.3 Acceptance of reference material values
11 - 11 TEST REPORT