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AS/NZS 1050.31:1994
[Current]Methods for the analysis of iron and steel, Part 31: Determination of niobium content — PAR spectrophotometric method
Specifies a PAR spectrometric method for the determination of niobium content between 0.005 percent and 1.3 percent in steel. This Standard is technically identical with and reproduced from ISO 9441:1988.
Published: 08/08/1994
Pages: 6
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
1 Scope
2 Normative references
3 Principle
4 Reagents
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
4.10
4.11
4.12
4.13
4.14
4.15
4.16
5 Apparatus
6 Sampling
7 Procedure
7.1 Test portion
7.2 Blank test
7.3 Determination
7.3.1 Dissolution of the test portion
7.3.2 Separation of the niobium
7.3.3 Preparation of the test solution
7.3.4 Colour development
7.3.5 Spectrophotometric measurement
7.4 Establishment of the calibration graph
7.4.1 Preparation of calibration solutions
7.4.2 Spectrophotometric measurements
7.4.3 Plotting of the calibration graph
8 Expression of results
8.1 Method of calculation
8.2 Precision
9 Test report
Annex A
Annex B
Cited references in this standard
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