ISO 1871:2009 PDF

Name: ISO 1871:2009 — Food and feed products — General guidelines for the determination of nitrogen by the Kjeldahl method
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Food and feed products — General guidelines for the determination of nitrogen by the Kjeldahl method

Название (английский):

ISO 1871:2009

Food and feed products — General guidelines for the determination of nitrogen by the Kjeldahl method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 11
Дата публикации:: 14 августа 2009 г.
Издание:: ISO IS 1871 edition 2 version 1
ICS:: 67.050

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Описание (английский):

ISO 1871:2009 provides general guidelines for the determination of nitrogen by the Kjeldahl method. It applies to food and feed products containing nitrogenous compounds that can be directly determined by the Kjeldahl method. This measurement principle does not take into account the nitrogen from nitrates and nitrites.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 1871:2009 - "Food and feed products - General guidelines for the determination of nitrogen by the Kjeldahl method" provides practical, laboratory-focused guidance for measuring organic nitrogen in food and feed matrices using the classical Kjeldahl method. It covers the full analytical workflow (digestion, alkalinization/distillation, titration) and clarifies critical control points, safety considerations and minimum performance objectives. Note: nitrogen from nitrates and nitrites is not included in this measurement principle.

Key topics and technical requirements

Principle: Conversion of organic nitrogen to ammonium sulfate by digestion with concentrated sulfuric acid plus catalysts; release of ammonia by addition of sodium hydroxide; capture in boric acid and titration with standardized acid to calculate nitrogen.

Reagents: Analytical-grade sulfuric acid, catalysts (commonly copper sulfate ± titanium oxide; potassium sulfate to raise boiling point), boric acid/indicator, H2O2 (optional, with care), concentrated NaOH, ammonium salts for controls.

Apparatus: Analytical balance (0.001 g), digestion units, steam-distillation and titration systems, anti-foaming agents and appropriate fume extraction.

Operating method: Guidance on test portion selection, acid volumes, digestion temperature/time, alkalinization and distillation procedures, endpoint detection (colorimetric or potentiometric).

Control tests & performance criteria:

Blank test and digestion control (using tryptophan, acetanilide or lysine hydrochloride) - digestion recovery should be 98–101%.
Distillation–titration control (using ammonium sulfate or chloride) - recovery should be 99–101%.

Results expression: Nitrogen % (or g/100 ml) calculated from titrant volumes and titre; formulae provided in the standard.

Safety: Warnings about hazardous reagents and the need for ventilation, safe handling of catalysts (selenium-containing), and care when adding oxidizers like H2O2.

Applications and users

ISO 1871:2009 is intended for:

Food and feed testing laboratories performing nitrogen determination / Kjeldahl nitrogen analyses.

Quality assurance, regulatory compliance and laboratory method validation teams.

Manufacturers, contract labs and research groups needing standardized guidance for Kjeldahl workflows across diverse matrices (meat, dairy, cereals, feeds). Nitrogen results are frequently used to calculate crude protein content (via appropriate conversion factors) for labeling, nutritional assessment and regulatory reporting.

Related standards

ISO 1871 provides general guidelines and complements matrix-specific standards, e.g.:

ISO 5983-1 (animal feeding stuffs - Kjeldahl method)

ISO 8968-1 (milk - Kjeldahl)

ISO 20483 (cereals and pulses - Kjeldahl)

Keywords: ISO 1871:2009, Kjeldahl method, nitrogen determination, food and feed analysis, digestion, distillation, titration, sulfuric acid, laboratory QA.

ISO 1871:2009 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and users

Related standards

Технические детали

SIST ISO 1871:2011

Food and feed products -- General guidelines for the determination of nitrogen by the Kjeldahl method

SIST EN ISO 5983-1:2005/AC:2009

Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1:…

SIST EN ISO 8968-1:2014

Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein cal…

SIST EN ISO 20483:2014

Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kje…