NF EN 13654-1

Soil improvers and growing media - Determination of nitrogen - Part 1 : modified Kjeldahl method

Le présent document décrit une méthode pour la détermination de l'azote dans les amendements du sol et les supports de culture. La méthode de Kjeldahl détermine la teneur en N-ammonium, N-nitrate, N-nitrite et N-organique des amendements du sol et des supports de culture. L'azote contenu dans les liaisons N-N, N-O et certains hétérocycliques (en particulier la pyridine) n'est déterminé que partiellement. Cette méthode ne s'applique pas aux amendements calciques ni aux matériaux préformés tels que la laine de roche et les mousses.

To comply with a standard, you need to quickly understand its issues in order to determine its impact on your activity.

The Requirements department helps you quickly locate within the normative text:
- mandatory clauses to satisfy,
- non-essential but useful clauses to know, such as permissions and recommendations.

The identification of these types of clauses is based on the document “ISO / IEC Directives, Part 2 - Principles and rules of structure and drafting of ISO documents ”as well as on a constantly enriched list of verbal forms.

With Requirements, quickly access the main part of the normative text!

- The UPSELL service allows you to easily update one of your standards.
- With a single click, add a new language, the Requirements or Redline+ service and add one or more additional users.
- Whether you are in the process of acquiring a standard or it is already available in your personal space, the UPSELL service is available at every stage to help you understand it and implement it within your organization.

COBAZ is the simple and effective solution to meet the normative needs related to your activity, in France and abroad.

Available by subscription, CObaz is THE modular solution to compose according to your needs today and tomorrow. Quickly discover CObaz!

Request your free, no-obligation live demo

I discover COBAZ