ISO 9647:2020
Steel — Determination of vanadium content — Flame atomic absorption spectrometric method (FAAS)
This document specifies a flame atomic absorption spectrometric method (FAAS) for the determination of the vanadium content in steel.
The method is applicable to vanadium contents between 0,01 % (mass fraction) and 0,80 % (mass fraction), provided that the tungsten content in a 1,0 g test portion is not higher than 1,0 % and/or the titanium content is not higher than 0,5 %.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
6.1 Atomic absorption spectrometer
6.1.1 Minimum precision (see Annex C)
6.1.2 Limit of detection (see Annex C)
6.1.3 Calibration linearity (see Annex C)
6.1.4 Characteristic concentration (see Annex C)
6.2 Ancillary equipment
7 Sampling
8 Procedure
8.1 Test portion
8.2 Blank test
8.3 Determination
8.3.1 Preparation of the test solution
8.3.2 Preparation of the calibration solutions
8.3.3 Adjustment of the atomic absorption spectrometer
8.3.4 Spectrometric measurements
9 Expression of results
9.1 Use of the calibration curve
9.2 Use of bracketing method
10 Precision
11 Test report
Annex A (informative) Additional information on the international interlaboratory test
Annex B (informative) Graphical representation of precision data
Annex C (normative) Procedures for the determination of instrumental criteria
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
6.1 Atomic absorption spectrometer
6.1.1 Minimum precision (see Annex C)
6.1.2 Limit of detection (see Annex C)
6.1.3 Calibration linearity (see Annex C)
6.1.4 Characteristic concentration (see Annex C)
6.2 Ancillary equipment
7 Sampling
8 Procedure
8.1 Test portion
8.2 Blank test
8.3 Determination
8.3.1 Preparation of the test solution
8.3.2 Preparation of the calibration solutions
8.3.3 Adjustment of the atomic absorption spectrometer
8.3.4 Spectrometric measurements
9 Expression of results
9.1 Use of the calibration curve
9.2 Use of bracketing method
10 Precision
11 Test report
Annex A (informative) Additional information on the international interlaboratory test
Annex B (informative) Graphical representation of precision data
Annex C (normative) Procedures for the determination of instrumental criteria
Bibliography