Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Safety remarks
5 Sample
   5.1 Sample pre-treatment
   5.2 Mass of test portion
6 Equipment
   6.1 Closed vessel system
       6.1.1 Microwave unit
       6.1.2 Digestion vessels
   6.2 Semi-open vessel system
       6.2.1 Microwave unit
       6.2.2 Digestion vessels
   6.3 General equipment
7 Reagents
8 Interferences and sources of error
   8.1 General informations
   8.2 Closed vessel system
   8.3 Semi-open vessel system
9 Procedure
   9.1 Blank test
   9.2 Procedure for closed vessels
       9.2.1 Amount of samples and reagents
       9.2.2 Digestion
       9.2.3 Complexation of HF
       9.2.4 Preparation of the solution for analysis
   9.3 Procedure for semi-open vessels
       9.3.1 Amount of samples
       9.3.2 Digestion and complexation of HF
       9.3.3 Preparation of the solution for analysis
10 Test report
Annex A (normative) Calibration of the powder adjustment
Annex B (informative) Validation
Bibliography