AS/NZS 1050.14:1994

AS/NZS 1050.14:1994 METHODS FOR THE ANALYSIS OF IRON AND STEEL - DETERMINATION OF MANGANESE IN IRON AND STEEL-TITRIMETRIC METHOD

PREFACE

CONTENTS

1 SCOPE

2 REFERENCED DOCUMENTS

3 PRINCIPLE

4 REAGENTS

4.1 General requirements

4.2 Solutions

4.2.1 Sulfuric acid (r20 1.84 g/mL)

4.2.2 Sulfuric acid (500 mL/L)

4.2.3 Sulfuric acid (150 mL/L)

4.2.4 Sulfuric acid (50 mL/L)

4.2.5 Sulfuric acid (25 mL/L)

4.2.6 Ammonium hydroxide solution (500 mL/L)

4.2.7 Hydrochloric acid (r20 1.18 g/mL)

4.2.8 Nitric acid (r20 1.42 g/mL)

4.2.9 Sulfurous acid solution

4.2.10 Zinc oxide suspension

4.2.11 Phosphoric acid-sulfuric acid mixture

4.2.12 Ammonium persulfate solution (125 g/L)

4.2.13 Ammonium iron(II) sulfate solution (approx. 20 g/L)

4.2.14 Silver nitrate solution (10 g/L)

4.2.15 Potassium dichromate solution (0.008 334 mol/L)

4.2.16 Preoxidized sodium diphenylamine sulfonate solution (3.2 g/L)

5 APPARATUS

6 SAMPLING

7 PROCEDURE

7.1 Number of determinations

7.2 Blank test

7.3 Check test

7.4 Dissolution of sample

7.5 Removal of interfering elements

7.6 Determination of manganese content

7.7 Standardization of ammonium iron(II) sulfate solution

8 CALCULATIONS

9 PRECISION

10 ACCEPTANCE OF ANALYTICAL VALUES

10.1 Single test sample

10.2 Replicate determinations

10.3 Acceptance of reference material values

11 TEST REPORT