BS EN 13654-1:2001

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Reagents
6 Apparatus
7 Test sample
8 Procedure
9 Calculation
10 Expression of results
11 Precision
12 Test report
Annex A (informative) Results of an inter-laboratory trial
        to determine nitrogen (modified Kjeldahl method)
Annex B (informative) Methods of analysis used in the
        inter-laboratory trial
Bibliography

Specifies a method for the determination of nitrogen in soil improvers and growing media and is not applicable to liming and preformed materials such as mineral wool slabs and foam slabs.

This European Standard specifies a method for the determination of nitrogen in soil improvers and growing media. The Kjeldahl method determines ammonium-N, nitrate-N, nitrite-N and organic N content of soil improvers and growing media. Nitrogen in N-N-linkages, N-O-linkages and some heterocyclics (especially pyridine) is only partially determined. [6], [7], [8] The method is not applicable to liming materials and preformed materials such as mineral wool slabs and foam slabs. NOTE The requirements of the standard may differ from the national legal requirements for the declaration of the products concerned.