Skip to content
Please enter a keyword to search

  • BS EN ISO 20483:2013

    Current The latest, up-to-date edition.

    Cereals and pulses. Determination of the nitrogen content and calculation of the crude protein content. Kjeldahl method

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  31-12-2013

    Publisher:  British Standards Institution

    Add To Cart

    Table of Contents - (Show below) - (Hide below)

    Foreword
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Principle
    5 Reagents
    6 Apparatus
    7 Sampling
    8 Preparation of test sample
    9 Determination of the moisture content
    10 Procedure
    11 Expression of results
    12 Precision
    13 Test report
    Annex A (informative) - Results of interlaboratory tests
    Annex B (informative) - Critical difference and practical
            application of the repeatability and reproducibility
            limits to different protein contents
    Annex C (informative) - Factors for converting nitrogen
            content to protein content
    Bibliography

    Abstract - (Show below) - (Hide below)

    Defines a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content.

    Scope - (Show below) - (Hide below)

    This International Standard specifies a method for the determination of the nitrogen content of cereals, pulses and derived products, according to the Kjeldahl method, and a method for calculating the crude protein content.

    The method does not distinguish between protein nitrogen and non-protein nitrogen. If it is important to determine the non-protein nitrogen content, an appropriate method would be applied.

    NOTE In certain cases, full recovery of the nitrogen in nitrates and nitrites is not possible by this method.

    General Product Information - (Show below) - (Hide below)

    Committee AW/4
    Development Note Supersedes 05/30131416 DC. (11/2006) Supersedes 12/30251275 DC. (01/2014)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    ISO 1871:2009 Food and feed products General guidelines for the determination of nitrogen by the Kjeldahl method
    ISO 5983-1:2005 Animal feeding stuffs Determination of nitrogen content and calculation of crude protein content Part 1: Kjeldahl method
    ISO 3188:1978 Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method
    ISO 712:2009 Cereals and cereal products — Determination of moisture content — Reference method
    ISO 5725-3:1994 Accuracy (trueness and precision) of measurement methods and results — Part 3: Intermediate measures of the precision of a standard measurement method
    ISO 5725-6:1994 Accuracy (trueness and precision) of measurement methods and results — Part 6: Use in practice of accuracy values
    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
    ISO 6540:1980 Maize Determination of moisture content (on milled grains and on whole grains)
    ISO 24333:2009 Cereals and cereal products — Sampling
    ISO 24557:2009 Pulses Determination of moisture content Air-oven method
    View more information

    • Access your standards online with a subscription

      Features

      • Simple online access to standards, technical information and regulations
      • Critical updates of standards and customisable alerts and notifications
      • Multi - user online standards collection: secure, flexibile and cost effective