AS/NZS 1050.26:1994
Methods for the analysis of iron and steel - Silicon in iron and steel - Spectrophotometric method
Specifies a spectrophotometric method using reduced beta-silicomolybdate complex, for the determination of the total silicon content of iron and steel. The method covers the range 0.005 percent to 5.0 percent silicon and is applicable to all grades of iron and steel.
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AS/NZS 1050.26:1994 METHODS FOR THE ANALYSIS OF IRON AND STEEL - SILICON IN IRON AND STEEL-SPECTROPHOTOMETRIC METHOD
PREFACE
CONTENTS
1 SCOPE
2 REFERENCED DOCUMENTS
3 PRINCIPLE
4 REAGENTS
4.1 General requirements
4.2 Solids
4.2.1 Iron sponge or chips (purity >99.99% Fe)
4.2.2 Silicon dioxide
4.2.3 Sodium carbonate
4.2.4 Sodium peroxide
4.3 Solutions
4.3.1 Ascorbic acid solution (20 g/L)
4.3.2 Nitric acid (150 mL/L)
4.3.3 Hydrochloric acid-nitric acid mixture
4.3.4 Sulfuric acid (250 mL/L)
4.3.5 Sulfuric acid (50 mL/L)
4.3.6 Sulfuric acid (7 mL/L)
4.3.7 Hydrogen peroxide (60 g/L)
4.3.8 Oxalic acid solution (50 g/L)
4.3.9 Potassium permanganate solution (22.5 g/L)
4.3.10 Sodium carbonate solution (10 g/L)
4.3.11 Sodium molybdate-sulfuric acid mixture
4.3.12 Sulfuric acid-nitric acid mixture
4.4 Standard Solution
5 APPARATUS
5.1 Spectrophotometer
5.2 Volumetric glassware
5.3 Spectrophotometric cells
5.4 Zirconium crucible
4.4.1 Stock silicon standard solution (1 mL b 1 mgSi)
4.4.2 Working silicon standard solution (1 mL b 200 mg Si)
6 SAMPLING
7 PROCEDURE
7.1 Number of determinations
7.2 Blank test
7.3 Check test
7.4 Procedure
7.5 Colour development
7.5.1 Aliquots for colour development
7.5.2 Colour reaction
7.5.3 Measurement of absorbance
7.6 Calibration
8 CALCULATION
9 PRECISION
10 ACCEPTANCE OF RESULTS
10.1 Single test sample
10.2 Replicate determinations
10.3 Acceptance of reference material values
11 TEST REPORT
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AS/NZS 1050.26:1994 METHODS FOR THE ANALYSIS OF IRON AND STEEL - SILICON IN IRON AND STEEL-SPECTROPHOTOMETRIC METHOD
PREFACE
CONTENTS
1 SCOPE
2 REFERENCED DOCUMENTS
3 PRINCIPLE
4 REAGENTS
4.1 General requirements
4.2 Solids
4.2.1 Iron sponge or chips (purity >99.99% Fe)
4.2.2 Silicon dioxide
4.2.3 Sodium carbonate
4.2.4 Sodium peroxide
4.3 Solutions
4.3.1 Ascorbic acid solution (20 g/L)
4.3.2 Nitric acid (150 mL/L)
4.3.3 Hydrochloric acid-nitric acid mixture
4.3.4 Sulfuric acid (250 mL/L)
4.3.5 Sulfuric acid (50 mL/L)
4.3.6 Sulfuric acid (7 mL/L)
4.3.7 Hydrogen peroxide (60 g/L)
4.3.8 Oxalic acid solution (50 g/L)
4.3.9 Potassium permanganate solution (22.5 g/L)
4.3.10 Sodium carbonate solution (10 g/L)
4.3.11 Sodium molybdate-sulfuric acid mixture
4.3.12 Sulfuric acid-nitric acid mixture
4.4 Standard Solution
5 APPARATUS
5.1 Spectrophotometer
5.2 Volumetric glassware
5.3 Spectrophotometric cells
5.4 Zirconium crucible
4.4.1 Stock silicon standard solution (1 mL b 1 mgSi)
4.4.2 Working silicon standard solution (1 mL b 200 mg Si)
6 SAMPLING
7 PROCEDURE
7.1 Number of determinations
7.2 Blank test
7.3 Check test
7.4 Procedure
7.5 Colour development
7.5.1 Aliquots for colour development
7.5.2 Colour reaction
7.5.3 Measurement of absorbance
7.6 Calibration
8 CALCULATION
9 PRECISION
10 ACCEPTANCE OF RESULTS
10.1 Single test sample
10.2 Replicate determinations
10.3 Acceptance of reference material values
11 TEST REPORT
AS/NZS 1050.26:1994
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