CEN/TR 15106:2005

Foreword
Introduction
1 Scope
2 Normative references
3 Test procedure for ring test A
4 Test procedure for ring test B
5 Final conclusion
Annex A (informative) Non-standardized method:
                      "Fertilizers - Determination of
                      Fe chelated by the chelating agents
                      EDDHA and EDDHMA in fertilizers by
                      ion pair chromatography"
Annex B (informative) Comments received from the participating
                      laboratories and suggestions of
                      CEN/TC 260/WG 5 for improvement of
                      the non-standardized method
Annex C (informative) Suggestions received from the
                      participating laboratories of
                      CEN/TC 260/WG 5 after ring test B
Bibliography

This Technical Report covers the results from two ring tests (A and B, see Introduction) to compare the repeatability and reproducibility of the standardized method for the determination of EDDHA and EDDHMA by ion chromatography (EN 13368 2:2001) with a non-standardized alternative method using ion-pair chromatography ("Lucena-method", given in Annex A). This Technical Report also provides the results of an univariate multifactorial ANOVA test and F-test for ring test A and F-test for ring test B to verify the significance of the reproducibility and the repeatability data.