Specifies a flame atomic absorption spectrometric method for the determination of chromium content between 0.002 percent and 2.0 percent in non-alloy and low alloy steel. The procedure involves dissolution of a test portion in acid and determination of the atomic absorption of the chromium spectral line, measured at either 357.9 nm or 425.4 nm in a flame atomic absorption spectrometer. This Standard is identical with and reproduced from ISO 10138:1991.
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
4.9.1
4.9.2
4.9.3
5 Apparatus
5.1
5.2
5.2.1 Minimum precision (see clause A.1).
5.2.2 Limit of detection (see clause A.2).
5.2.3 Graph linearity (see clause A.3).
5.2.4 Characteristic concentration (see clause A.4).
5.3
6 Sampling
7 Procedure
7.1 Test portion
7.2 Blank test
7.3 Determination
7.3.1 Preparation of the test solution
7.3.1.1 Dissolution of the test portion
7.3.1.2 Treatment of insoluble residue
7.3.1.3 Dilution of the test solution
7.3.2 Preparation of the calibration solutions
7.3.3 Adjustment of atomic absorption spectrometer
7.3.4 Optimizing the atomic absorption spectrometer settings
7.3.5 Spectrometric measurements
7.4 Plotting the calibration graph
8 Expression of results
8.1 Method of calculation
8.2 Precision
9 Test report
Annex A
A.1 Determination of minimum precision
A.2 Determination of limit of detection ρCr, min
A.3 Criterion for graph linearity
A.4 Determination of characteristic concentration ρCr,k
