Foreword
Introduction
1 Scope
2 Terms and definitions
3 Principle
4 Reagents
5 Apparatus
6 Sampling
7 Sample preparation
8 Procedure
   8.1 Blank solutions
   8.2 Standards
   8.3 Standard curve
   8.4 Phytase level control
   8.5 Feed test portions
9 Calculations
   9.1 Formulation standard curve
   9.2 Calculation phytase activity
   9.3 Correction for phytic acid purity and
        water content
   9.4 Interference with blank values
10 Precision
   10.1 Limit of detection and limit of quantification
   10.2 Interlaboratory test
   10.3 Repeatability
   10.4 Reproducibility
11 Test report
Annex A (informative) - Interlaboratory study results
Bibliography