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  • BS EN ISO 20541:2008

    Current The latest, up-to-date edition.

    Milk and milk products. Determination of nitrate content. Method by enzymatic reduction and molecular- absorption spectrometry after Griess reaction

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  30-09-2008

    Publisher:  British Standards Institution

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

    Foreword
    Foreword
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Principle
    5 Reagents
    6 Apparatus
    7 Sampling
    8 Preparation of test sample
       8.1 Dried milk, dried whey and milk
            protein concentrates
       8.2 Caseins and caseinates
       8.3 Cheese
       8.4 Whey cheese
    9 Procedure
       9.1 Preparation of the test portion
       9.2 Removal of fat and protein
       9.3 Reagent blank test
       9.4 Determination
       9.5 Calibration
    10 Calculation and expression of results
       10.1 Nitrite (matrix blank) content
       10.2 Total nitrite/nitrate content
       10.3 Nitrate content
    11 Precision
       11.1 Interlaboratory testing
       11.2 Repeatability
       11.3 Reproducibility
    12 Test report
    Annex A (informative) - Interlaboratory trials
    Bibliography

    Abstract - (Show below) - (Hide below)

    Describes a method for the determination of the nitrate content of milk and milk products by molecular-absorption spectrometry after Griess reaction (preceded by enzymatic reduction).

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

    Committee AW/5
    Development Note Supersedes 06/30150050 DC. (09/2008)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

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

    ISO 707:2008 Milk and milk products — Guidance on sampling
    ISO 1042:1998 Laboratory glassware One-mark volumetric flasks
    ISO 648:2008 Laboratory glassware — Single-volume pipettes
    ISO 835:2007 Laboratory glassware — Graduated pipettes
    ISO 565:1990 Test sieves — Metal wire cloth, perforated metal plate and electroformed sheet — Nominal sizes of openings
    EN 12014-3:2005 Foodstuffs - Determination of nitrate and/or nitrite content - Part 3: Spectrometric determination of nitrate and nitrite content of meat products after enzymatic reduction of nitrate to nitrite
    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 3696:1987 Water for analytical laboratory use — Specification and test methods
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