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CEN
CEN/TS 16490:2013

CEN/TS 16490:2013

Current

Current

The latest, up-to-date edition.

Fertilizers - Comparison of the CEN/TC 260/WG 7 ring test results with tolerances given in the Regulation (EC) Nr 2003/2003 Annex II and conclusions

Published date

10-04-2013

Publisher

Comite Europeen de Normalisation

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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Statistical method validation
5 Conclusions
Annex A (informative) - Statistical data of the inter-laboratory
        tests and findings
Annex B (informative) - Refined statistical evaluation
Bibliography

In Regulation (EC) No. 2003/2003 [2] tolerance limits are mentioned for nutrient contents in mineral fertilizers (Annex II of Regulation (EC) No. 2003/2003) as well as prescribed methods for control purposes (Annex IV of Regulation (EC) No. 2003/2003). Prior to the work done by CEN/TC 260 following Mandate M/335, no statistical data were available for the official analytical methods to be applied. Due to the standardization work done for this mandate, statistical data have been generated as ring testing was a major topic in this mandate. This Technical Specification describes to what extent the presently applied tolerances are in line with the obtained precision data from the analytical methods studied. The purpose of this document is to give feedback on the applied tolerances within Regulation (EC) No. 2003/2003 based on the method evaluation done as an outcome of the work executed by CEN/TC 260/WG 7 according to Mandate M/335. This evaluation of the tolerances was part of Mandate M/418.

Committee
CEN/TC 260
DocumentType
Technical Specification
PublisherName
Comite Europeen de Normalisation
Status
Current

ISO 5725-1:1994 Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
EN 15477:2009 Fertilizers - Determination of the water-soluble potassium content
EN 16197:2012 Fertilizers - Determination of magnesium by atomic absorption spectrometry
EN 16198:2012 Fertilizers - Determination of magnesium by complexometry
EN 15956:2011 Fertilizers - Extraction of phosphorus soluble in mineral acids
EN 15750:2009 Fertilizers - Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
EN 16199:2012 Fertilizers - Determination of the sodium extracted by flame-emission spectrometry
EN 15479:2009 Fertilizers - Spectrophotometric determination of biuret in urea
EN 15478:2009 Fertilizers - Determination of total nitrogen in urea
EN 15926:2011 Fertilizers - Extraction of water soluble sulfur where the sulfur is in various forms
EN 15925:2011 Fertilizers - Extraction of total sulfur present in various forms
EN 16195:2012 Fertilizers - Determination of chlorides in the absence of organic material
EN 16196:2012 Fertilizers - Manganimetric determination of extracted calcium following precipitation in the form of oxalate
EN 15958:2011 Fertilizers - Extraction of water soluble phosphorus
EN 15960:2011 Fertilizers - Extraction of total calcium, total magnesium, total sodium and total sulfur in the forms of sulfates
ISO 5725-2:1994 Accuracy (trueness and precision) of measurement methods and results Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
EN 15961:2017 Fertilizers - Extraction of water-soluble calcium, magnesium, sodium and sulfur in the form of sulfates
EN 15475:2009 Fertilizers - Determination of ammoniacal nitrogen
ISO 5315:1984 Fertilizers — Determination of total nitrogen content — Titrimetric method after distillation
EN 15957:2011 Fertilizers - Extraction of phosphorus which is soluble in neutral ammonium citrate
EN 15476:2009 Fertilizers - Determination of nitric and ammoniacal nitrogen according to Devarda
EN 15749:2009 Fertilizers - Determination of sulfates content using three different methods

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