Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Procedure
7.1 Sampling and preparation of samples
7.2 Preparation of analytical solution
7.3 Determination of chromium(VI) in the solution
obtained from the extraction procedure
7.4 Blank solution
7.5 Calibration
7.6 Determination of the recovery rate
7.6.1 Influence of the matrix
7.6.2 Influence of the RP material
8 Calculation and expression of results
8.1 Calculation of chromium(VI) content
8.2 Recovery rate
8.3 Expression of results
9 Test report
Annex A (informative) Reversed phase material
Annex B (informative) Accuracy