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BS ISO 20620:2021

BS ISO 20620:2021

$86.31

Fertilizers and soil conditioners. Determination of total nitrogen by combustion

Published By Publication Date Number of Pages
BSI 2021 12
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This document specifies a method for the determination of total nitrogen content in all nitrogen containing fertilizers by combustion method.

NOTE 1

The presence of non-nutritive sources of nitrogen (e.g. chelating agents) causes positive bias to samples being analysed for nutritive nitrogen content. The non-nutritive nitrogen content is subtracted from the total nitrogen value to determine the nutritive nitrogen content.

NOTE 2

Common internationally traded fertilizers were evaluated for total nitrogen by combustion analysis in the ring-study in this document. While the fertilizers analysed in this international ring study were mineral fertilizers, previous studies have shown that total nitrogen by combustion is suitable for use with many non-mineral, nitrogen-containing fertilizers.

PDF Catalog

PDF Pages PDF Title
2 National foreword
6 Foreword
7 1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
5.2 Analytical balance.
8 5.4 Customary chemically resistant glass.
6 Chemicals
6.2 Standard substances for nitrogen determination, preferably with certified nitrogen content.
7 Procedure
7.1 General
9 7.2 Reference curve
7.3 Inspection and calibration
7.4 Measurement
8 Results
8.1 Calculation
8.2 Expression of results
9 Precision
11 Bibliography

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BS ISO 20620:2021
$86.31