1 Scope
2 Normative references
3 Principle
4 Reagents
5 Apparatus
6 Sample
6.1 Test sample
6.2 Test portion
7 Procedure
7.1 Number of determinations
7.2 Blank test
7.3 Dissolution of test portion
7.4 Preparation of the ion-exchange column
7.5 Adsorption of zinc on ion-exchange column
7.6 Elution of zinc from ion-exchange column
7.7 Titration
7.8 Determination of the titration factor of the
EDTA standard volumetric solution
8 Expression of results
9 Precision
9.1 Expression of precision
9.2 Procedure for obtaining the final result
9.3 Between-laboratories precision
9.4 Check of trueness
10 Test report
Annex A (normative) Ion-exchange resins and columns
Annex B (normative) Procedure for the preparation
and determination of the mass of a predried
test portion
Annex C (normative) Determination of cadmium by atomic
absorption spectrometry
Annex D (normative) Flowchart of the procedure for the
acceptance of analytical values for test samples
Annex E (informative) Effect of potentially interfering
elements
Annex F (informative) Derivation of precision equations
Bibliography