Name: SIST-TS CEN/TS 16490:2013 — 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
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SIST-TS CEN/TS 16490:2013 PDF

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

Название (английский):

SIST-TS CEN/TS 16490:2013

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

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 34
Дата публикации:: 22 апреля 2013 г.
ICS:: 65.080
Технический комитет:: KAT - Soil quality

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Описание (английский):

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.

Overview

CEN/TS 16490:2013 is a CEN Technical Specification that compares ring test (inter‑laboratory) results generated by CEN/TC 260/WG 7 with the nutrient tolerances specified in Regulation (EC) No. 2003/2003 (Annex II). Prepared under Mandates M/335 and reviewed under M/418, the document assesses whether existing regulatory tolerances for mineral fertilizer nutrient contents align with the precision data (repeatability and reproducibility) obtained from standardized analytical methods.

Key topics

Scope and purpose: Evaluates analytical variability from ring tests and provides feedback on regulatory tolerances for nutrient contents in mineral fertilizers.
Ring testing methodology: Ring tests were conducted across European laboratories following ISO 5725-2 principles to derive repeatability (r) and reproducibility (R) statistics.
Statistical evaluation: Classical outlier tests (Grubb’s, Cochran’s) and a refined statistical analysis (removing data outside 99.9% confidence intervals) were applied to reconcile method performance with tolerances.
Findings:
- Most methods produced precision data that do not necessitate immediate tolerance changes.
- Some analytes (e.g., water‑soluble sulfur and calcium) showed high reproducibility values, prompting deeper statistical scrutiny.
- Theoretical relationship used: R should be ≤ 0.7 · T (tolerance); if not met, options include improving methods, proposing alternative methods, or increasing tolerances.
Field data cross‑check: Approximately 450 anonymized enforcement analyses (e.g., CAN, CAN+MgO, NPK) were reviewed to see if enforcement conflicts exist between analytical results and tolerances.

Applications

This Technical Specification is practical for:

Regulatory authorities / enforcement labs assessing whether current fertilizer tolerances are compatible with laboratory precision and sampling variability.
Testing and calibration laboratories performing method validation, inter‑laboratory comparisons, and quality assurance for fertilizer analysis.
Fertilizer manufacturers and quality managers evaluating compliance risk and understanding analytical uncertainty in nutrient declaration.
Standards developers and statisticians seeking documented examples of applying ISO 5725 principles to complex product portfolios.

Related standards and references

Regulation (EC) No. 2003/2003 (Annex II - tolerances; Annex IV - control methods)
ISO 5725-1 / ISO 5725-2 (accuracy, repeatability and reproducibility of measurement methods)
CEN/TC 260 deliverables and Mandates M/335 and M/418

By linking ring test precision data with regulatory tolerances, CEN/TS 16490:2013 supports evidence‑based decisions on analytical method performance, enforcement practice, and potential tolerance revision for mineral fertilizers.

SIST-TS CEN/TS 16490:2013 PDF

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Abstract

Overview

Key topics

Applications

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