Nitrogen determination principle of Kjeldahl method

Nitrogen determination principle of Kjeldahl method, Total:226 items.

The international standard classification for "Nitrogen determination principle of Kjeldahl method" includes: Animal feeding stuffs , Chemical laboratories. Laboratory equipment , Water quality .

The Chinese standard classification for "Nitrogen determination principle of Kjeldahl method" includes: Analysis methods for toxic substances in water , Livestock and poultry feed and additive , Electrochemical, thermochemistry and optical profile type analyzer , Photographic-grade chemicals , Analysis methods for environmental quality of soils .

Group Standards of the People's Republic of China

T/QAS 071-2021 Determination of total nitrogen in brine Kjeldahl method
T/NAIA 044-2021 Urine Total Nitrogen Determination in Livestock Kjeldahl Method
T/NAIA 060-2021 Determination of true protein in feed Kjeldahl method
T/NAIA 001-2020 Determination of ammoniacal nitrogen in fermented feed Kjeldahl method
T/NAIA 0139-2022 Diesel engine nitrogen oxide reducing agent urea aqueous solution (AUS 32) Determination of urea content Automatic Kjeldahl method

Ningxia Provincial Standard of the People's Republic of China

DB64/T 1734-2020 Soil Hydrolyzable Nitrogen Determination Kjeldahl Method

Jilin Provincial Standard of the People's Republic of China

DB22/T 1932-2013 Determination method of total nitrogen content in peat (Kjeldahl method)
DB22/T 1995-2014 Determination of feed grade choline chloride content Kjeldahl method

Ministry of Ecology and Environment of the People's Replublic of China

GB 11891-1989 Water quility-Determination of Kjeldahl nitrogen

General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China

GB/T 33862-2017 Automatic(semi) Kjeldahl analyzer
GB/T 41965-2022 Photography—Processing waste—Determination of total amino nitrogen (microdiffusion Kjeldahl method)
GB/T 6432-2018 Determination of crude protein in feeds—Kjeldahl method
GB/T 11891-1989 Water quality--Determination of Kjeldahl nitrogen

Professional Standard - Environmental Protection

HJ 717-2014 Soil quality - Determination of total nitrogen - Modified Kjeldahl method
HJ/T 196-2005 Water quality -- Determination of Kjeldahl-nitrogen Gas-phase molecular absorption spectrometry

Inner Mongolia Provincial Standard of the People's Republic of China

DB15/T 1236-2017 Determination of volatile basic nitrogen in feedstuffs of animal origin by automatic Kjeldahl method

Shandong Provincial Standard of the People's Republic of China

DB37/T 2485-2014 Technical conditions for full (semi) automatic Kjeldahl nitrogen analyzer

IN-BIS

IS 5194-1969 Determination method of nitrogen-Kjeldahl method

Danish Standards Foundation

DS 242:1988 Water quality. Kjeldahl-nitrogen. Kjeldahl-method
DS/EN ISO 8968-1:2002 Milk - Determination of nitrogen content - Part 1: Kjeldahl method
DS/EN 12135:1998 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
DANSK DS/EN 12135:1997 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
DANSK DS/EN ISO 8968-1:2014 Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation
DANSK DS/EN ISO 3188:1994 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method
DANSK DS/ISO 1871:2009 Food and feed products - General guidelines for the determination of nitrogen by the Kjeldahl method
DS/EN ISO 3188:1995 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method
DS/ISO 5663:1994 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
DANSK DS/EN 25663:1994 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
DS/ISO 1871:2009 Food and feed products - General guidelines for the determination of nitrogen by the Kjeldahl method
DANSK DS/ISO 5663:1994 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium
DS/EN 13342:2001 Characterisation of sludges - Determination of total Kjeldahl nitrogen
DS/EN 25663:1994 Water quality-Determination of Kjeldahl nitrogen-Method after mineralization with selenium
DANSK DS/EN ISO 5378:1994 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophometric method
DANSK DS/EN 13342:2001 Characterisation of sludges - Determination of total Kjeldahl nitrogen
DS/EN ISO 20483:2007 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
DS/EN ISO 5378:1995 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophometric method
DANSK DS/EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
DS/EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
DANSK DS/EN ISO 20483:2014 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
DS/EN 16169:2012 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen
DANSK DS/EN 16169:2012 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen
DS/EN ISO 5983-1:2005 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method
DS/EN ISO 5983-1/AC:2009 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method
DANSK DS/EN ISO 5983-1:2005 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method

International Organization for Standardization (ISO)

ISO 332:1974 Title missing - Legacy paper document
ISO 332:1981 Coal — Determination of nitrogen — Macro Kjeldahl method
ISO 8968-1:2001 | IDF 20-1: 2001 Milk — Determination of nitrogen content — Part 1: Kjeldahl method
ISO 8968-1:2014 | IDF 20-1:2014 Milk and milk products — Determination of nitrogen content — Part 1: Kjeldahl principle and crude protein calculation
ISO 1871:2009 Food and feed products - General guidelines for the determination of nitrogen by the Kjeldahl method
ISO 5663:1984 Water quality; Determination of Kjeldahl nitrogen; Method after mineralization with selenium
ISO/TS 17837:2008 | IDF/RM 25: 2008 Processed cheese products — Determination of nitrogen content and crude protein calculation — Kjeldahl method
ISO 3188:1978 Starches and derived products; Determination of nitrogen content by the Kjeldahl method; Titrimetric method

Association Francaise de Normalisation

NF V04-211:1971 MILK. DETERMINATION OF TOTAL NITROGEN CONTENT. (KJELDAHL METHOD).
NF EN 12135:1997 Fruit and vegetable juices - Nitrogen dosage - Kjeldahl method
NF ISO 11261:1995 Soil quality - Total nitrogen dosage - Modified Kjeldahl method
NF V04-221-1*NF EN ISO 8968-1:2014 Milk and milk products - Determination of nitrogen content - Part 1 : Kjeldahl principle and crude protein calculation
NF EN ISO 3188:1994 Starches and derived products - Determination of nitrogen according to the Kjeldahl method - Titrimetric method
NF EN 13342:2000 Characterization of sludge - Determination of Kjeldahl nitrogen
NF X31-111*NF ISO 11261:1995 Soil quality. Determination of total nitrogen. Modified kjeldahl method.
NF V03-032:2024 Foodstuffs - Determination of the nitrogen content by the Kjeldahl method and calculation of the protein content
NF ISO 1871:2009 Food and feed products - General guidelines for the determination of nitrogen using the Kjeldahl method
NF EN 25663:1994 Water quality - Kjeldahl nitrogen dosage - Method after selenium mineralization
NF EN 13654-1:2002 Soil amendments and growing media - Determination of nitrogen - Part 1: modified Kjeldahl method
NF EN ISO 20483:2014 Cereals and legumes - Determination of nitrogen content and calculation of crude protein content - Kjeldahl method
NF V03-750:1999 Cereals and pulses. Determination of the nitrogen content and calculation of the raw protein content. Kjeldahl method.
NF EN ISO 5378:1994 Starches and derived products - Determination of nitrogen according to the Kjeldahl method - Spectrophotometric method
NF EN 16169:2012 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen
NF EN ISO 5983-1:2005 Animal feed - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method

British Standards Institution (BSI)

BS EN ISO 8968-1:2002 Milk. Determination of nitrogen content-Kjeldahl method
BS ISO 6851:2001 Photography. Processing waste. Determination of total amino nitrogen (microdiffusion Kjeldahl method)
BS 7755-3.7:1995 Soil quality. Chemical methods. Determination of total nitrogen. Modified Kjeldahl method
BS EN ISO 3188:1994(1999) Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method
BS EN ISO 5378:1994(1999) Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectrometric method
DD ISO/TS 17837:2008 Milk and milk products. Determination of nitrogen content and crude protein calculation. Kjeldahl method
BS DD ISO/TS 17837:2008 Milk and milk products. Determination of nitrogen content and crude protein calculation. Kjeldahl method
BS EN 25663:1993 Water quality. Determination of Kjeldahl nitrogen. Method after mineralization with selenium
BS EN ISO 8968-1:2014 Milk and milk products. Determination of nitrogen content. Kjeldahl principle and crude protein calculation
BS 5697-1:1979 Methods of test for starch and its derivatives and by-products. Determination of nitrogen conteny by the Kjeldahl method ( titrimetric method)
07/30142476 DC BS ISO 1871. Food products. General guidelines for the determination of nitrogen by Kjedahl method
BS EN ISO 5983-1:2005(2009) Animal feeding stuffs — Determination of nitrogen content and calculation of crude protein content — Part 1 : Kjeldahl method

Korean Agency for Technology and Standards (KATS)

KS E ISO 333-2018 Coal－Determination of nitrogen－Semi-micro Kjeldahl method
KS E ISO 333-2003(2013) Coal－Determination of nitrogen－Semi-micro Kjeldahl method
KS I ISO 11261-2008(2021) Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS I ISO 11261-2008(2018) Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS H ISO 1871-2013(2023) Agricultural food products ― General directions for the determination of nitrogen by the Kjeldahl method
KS I ISO 11261-2021 Soil quality－Determination of total nitrogen－Modified Kjeldahl method
KS H ISO 1871-2023 Agricultural food products ― General directions for the determination of nitrogen by the Kjeldahl method
KS H ISO 3188-2023 Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Titrimetric method
KS H ISO 3188-2008(2018) Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Titrimetric method
KS H ISO 3188-2008(2023) Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Titrimetric method
KS I ISO 5663-2023 Water quality — Determination of Kjeldahl nitrogen — Method after mineralization with selenium
KS I ISO 5663-2007(2017) Water quality－Determination of Kjeldahl nitrogen－Method after mineralization with selenuium
KS H ISO 5378-2023 Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Spectrophotometric method
KS M ISO 6851-2002(2017) Photography－Processing waste－Determination of total amino nitrogen－Microdiffusion Kjeldahl method
KS H ISO 5378-2008(2018) Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Spectrophotometric method
KS H ISO 5378-2008(2023) Starches and derived products－Determination of nitrogen content by the Kjeldahl method－Spectrophotometric method
KS M ISO 6851-2022 Photography－Processing waste－Determination of total amino nitrogen－Microdiffusion Kjeldahl method
KS I ISO 5663:2007 Water quality－Determination of Kjeldahl nitrogen－Method after mineralization with selenuium
KS H ISO 1871-2013(2018) Agricultural food products ― General directions for the determination of nitrogen by the Kjeldahl method

Swedish Institute for Standards

SS-ISO 333:1996 Coal - Determination of nitrogen - Semi-micro Kjeldahl method
SS 28101:1992 Nitrogen content of water - Determination with Kjeldahl method after reduction with Devarda's alloy
SS-ISO 11261:1996 Soil quality - Determination of total nitrogen - Modified Kjeldahl method
SS-EN 12135:1998 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
ISO 3188 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method
SS-EN 13342:2000 Characterization of sludges - Determination of Kjeldahl nitrogen
SS-EN ISO 8968-1:2002 Milk - Determination of nitrogen content - Part 1: Kjeldahl method (ISO 8968-1:2001)
ISO 6851 Photography - Processing waste - Determination of total amino nitrogen (microdiffusion Kjeldahl method)
SS-EN ISO 3188:1995 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)
SS-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
SS-EN ISO 5378:1995 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophotometric method (ISO 5378:1978)
SS-EN ISO 20483:2006 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2006)

SE-SIS

SIS SS 18 71 63-1984 Coal - Determination of nitrogen - Macro Kjeldahl method
SIS SS 02 81 01-1992 Nitrogen content of water — Determination with Kjeldahl method after reduction with Devarda's alloy

VN-TCVN

TCVN 6498-1999 Soil quality.Determination of total nitrogen.Modifierd Kejldahl method
TCVN 6014-2007 Hard coal.Determination of nitrogen.Semi-micro Kjeldahl method
TCVN 5987-1995 Water quality.Determination of Kjeldahl nitrogen.Method after mineralization with selenium

Association of Official Analytical Chemists (AOAC)

AOAC 991.20 AOAC Official Method 991.20 Nitrogen (Total) in Milk Kjeldahl Methods

Gosstandart of Russia

GOST 34111-2017 Juice products. Determination of nitrogen content by Kjeldahl method
GOST 2408.2-1975 Brown coals, hard coals, anthracite, combustible shales and turf. Method for thedetermination of nitrogen content
GOST 34789-2021 Brewing products. Identification. Determination of mass concentration of total nitrogen by Kjeldahl method
GOST R 55246-2012 Milk and milk products. Determination of non-protein nitrogen content by Kjeldahl method
GOST 26889-1986 Food-stuffs and food additives. General directions for the determinations of nitrogen content by the Kjeldahl method
GOST 34454-2018 Dairy products. Determination of protein content by the Kjeldahl method

BE-NBN

NBN T 91-255-1976 Water analysis methods - Determination of the ammoniacal and organic nitrogen - (Kjeldahl nitrogen)

Indonesia Standards

SNI 4146-2013 Method for determination of total nitrogen content in sediment by Kjeldahl titration method

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 11261:2015 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
OS GSO ISO 1871:2008 Agricultural food products — General directions for the determination of nitrogen by the Kjeldahl method
OS GSO ISO 8968-1:2014 Milk and milk products -- Determination of nitrogen content -- Part 1: Kjeldahl principle and crude protein calculation
OS GSO ISO 20483:2013 Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method
OS GSO ISO 5983-1:2007 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method

Kingdom of Bahrain Testing and Metrology Directorate

BH GSO ISO 11261:2017 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
BH GSO ISO 5663:2016 Water quality -- Determination of Kjeldahl nitrogen -- Method after mineralization with selenium

GCC Standardization Organization

GSO ISO 11261:2015 Soil quality -- Determination of total nitrogen -- Modified Kjeldahl method
GSO ISO 1871:2008 Agricultural food products — General directions for the determination of nitrogen by the Kjeldahl method
GSO ISO 3188:2015 Starches and derived products -- Determination of nitrogen content by the Kjeldahl method -- Titrimetric method
GSO ISO 5663:2015 Water quality -- Determination of Kjeldahl nitrogen -- Method after mineralization with selenium
GSO ISO 6851:2015 Photography -- Processing waste -- Determination of total amino nitrogen (microdiffusion Kjeldahl method)
GSO ISO 5378:2015 Starches and derived products -- Determination of nitrogen content by the Kjeldahl method -- Spectrophotometric method
GSO ISO 20483:2013 Cereals and pulses -- Determination of the nitrogen content and calculation of the crude protein content -- Kjeldahl method

South African Bureau of Standard

SANS 333:1996 Coal - Determination of nitrogen - Semi-micro Kjeldahl method
SANS 8968-1:2006 Milk - Determination of nitrogen content Part 1: Kjeldahl method

Spanish Association for Standardization (UNE)

UNE 77318:2001 Soil quality. Determination of total nitrogen. Modified Kjeldahl method.
UNE-EN 12135:1998 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
UNE 32013:1995 COAL. DETERMINATION OF NITROGEN. SEMI-MICRO KJELDAHL METHOD.
UNE-EN 13342:2001 Characterization of sludges - Determination of Kjeldahl nitrogen
UNE-EN ISO 8968-1:2002 Milk - Determination of nitrogen content - Part 1: Kjeldahl method. (ISO 8968-1:2001)
AENOR UNE-EN 13342:2001 Characterization of sludges - Determination of Kjeldahl nitrogen
UNE-EN ISO 3188:1995 STARCHES AND DERIVED PRODUCTS. DETERMINATION OF NITROGEN CONTENT BY THE KJELDAHL METHOD. TITRIMETRIC METHOD. (ISO 3188:1978).
UNE-EN ISO 8968-1:2014 Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation (ISO 8968-1:2014)
AENOR UNE 53282:1975 Plastic materials. Determination of nitrogen content in resins and plastic materials by the Kjeldahl method.
AENOR UNE-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
UNE-EN 13654-1:2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
UNE-EN ISO 20483:2007 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2006)
UNE-EN 25663:1994 WATER QUALITY. DETERMINATION OF KJELDAHL NITROGEN. METHOD AFTER MINERALIZATION WITH SELENIUM. (ISO 5663:1984).
UNE-EN ISO 20483:2014 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013)
UNE-EN 16169:2012 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen (Endorsed by AENOR in October of 2012.)
UNE-EN ISO 5983-1:2007/AC:2009 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method (ISO 5983-1:2005/Cor 1:2008)

American Society for Testing and Materials (ASTM)

ASTM D3590-11 Standard Test Methods for Total Kjeldahl Nitrogen in Water
ASTM D3590-02 Standard Test Methods for Total Kjeldahl Nitrogen in Water
ASTM D3590-17 Standard Test Methods for Total Kjeldahl Nitrogen in Water
ASTM E147-61(2017) Standard Specification for Apparatus for Microdetermination of Nitrogen by Kjeldahl Method
ASTM E258-67(2002) Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method
ASTM D3228-22 Standard Test Method for Total Nitrogen in Lubricating Oils and Fuel Oils by Modified Kjeldahl Method
ASTM RR-D31-1008 1996 D2868-Standard Test Method for Nitrogen Content (Kjeldahl) and Hide Substance Content of Leather

International Dairy Federation (IDF)

IDF 20-1-2001 Milk - Determination of nitrogen content - Part 1: Kjeldahl method
IDF 20-1-2014 Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation

Lithuanian Standards Office

LST EN 12135-2001 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
LST EN ISO 8968-1:2002 Milk - Determination of nitrogen content - Part 1: Kjeldahl method (ISO 8968-1:2001)
LST EN 13342-2002 Characterization of sludges - Determination of Kjeldahl nitrogen
LST EN ISO 3188:2000 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978)
LST EN 13654-1-2002 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method
LST EN 25663-2000 Water quality - Determination of Kjeldahl nitrogen - Method after mineralization with selenium (ISO 5663:1984)
LST EN 16169-2012 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen
LST EN ISO 20483:2007 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2006)
LST EN ISO 5378:2000 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophotometric method (ISO 5378:1978)

German Institute for Standardization

DIN EN 12135:1997-12 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method; German version EN 12135:1997
DIN EN ISO 8968-1:2014-06 Milk and milk products - Determination of nitrogen content - Part 1: Kjeldahl principle and crude protein calculation (ISO 8968-1:2014); German version EN ISO 8968-1:2014
DIN 51722-1:1990-07 Testing of solid fuels; determination of nitrogen content; semi-micro Kjeldahl method
DIN EN ISO 8968-1 E:2013-04 Determination of nitrogen content of milk and milk products Part 1: Principles of Kjeldahl method and calculation of crude protein (draft)
DIN EN ISO 8968-1:2002 Milk — Determination of nitrogen content — Part 1: Kjeldahl method (ISO 8968-1:2001)
DIN EN 13342:2001-01 Characterization of sludges - Determination of Kjeldahl nitrogen; German version EN 13342:2000
DIN EN ISO 3188:1994-10 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Titrimetric method (ISO 3188:1978); German version EN ISO 3188:1994
DIN EN ISO 20483:2014-03 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method (ISO 20483:2013); German version EN ISO 20483:2013
DIN EN 13654-1:2002-01 Soil improvers and growing media - Determination of nitrogen - Part 1: Modified Kjeldahl method; German version EN 13654-1:2001
DIN EN 25663:1993-11 Water quality; determination of Kjeldahl nitrogen; method after mineralization with selenium (ISO 5663:1984); German version EN 25663:1993
DIN EN ISO 5378:1994-10 Starches and derived products - Determination of nitrogen content by the Kjeldahl method - Spectrophotometric method (ISO 5378:1978); German version EN ISO 5378:1994
DIN EN ISO 8968-1 E:2013 Draft Document - Milk and milk products - Determination of nitrogen content and crude protein calculation - Part 1: Kjeldahl principle (ISO/DIS 8968-1:2013); German version prEN ISO 8968-1:2013
DIN EN ISO 5983-1:2005-10 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method (ISO 5983-1:2005); German version EN ISO 5983-1:2005
DIN EN 16169:2012-11 Sludge, treated biowaste and soil - Determination of Kjeldahl nitrogen; German version EN 16169:2012
DIN EN ISO 20483 E:2012-07 Determination of nitrogen content and calculation of crude protein content in cereals and legumes Kjeldahl method (draft)
DIN EN ISO 5983-1 Berichtigung 1:2009-07 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Part 1: Kjeldahl method (ISO 5983-1:2005); German version EN ISO 5983-1:2005, Corrigendum to DIN EN ISO 5983-1:2005-10; German version EN ISO 5983-1:20...

CZ-CSN

CSN 56 0020-1987 General directions for the determination f nitrogen by the Kjeldahl method
CSN ISO 1871:1994 Agricultural food products-General directions for the determination of nitrogen by the Kjeldahl method

Ente Nazionale Italiano di Unificazione

UNI EN 12135:1999 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
UNI EN 25663:1995 Water quality. Determination of Kjeldahl nitrogen. Method aftyer mineralization with selenium.
UNI EN 13342:2002 Characterisation of sludges - Determination of Kjeldahl nitrogen
UNI EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Modified Kjeldahl method
EC 1-2023 UNI EN 13654-1:2001 Soil improvers and growing media - Determination of nitrogen - Modified Kjeldahl metho
UNI ISO/TS 17837:2013 Processed cheese products - Determination of nitrogen content and crude protein calculation - Kjeldahl method
UNI EN ISO 20483:2014 Cereals and pulses - Determination of the nitrogen content and calculation of the crude protein content - Kjeldahl method
UNI 10760:1998 Dairy products - General directives for the nitrogen determination according to Kjeldahl method
UNI EN ISO 3188:1995 Starches and derived products. Determination of nitrogen content by the Kjeldahl method. Tritimetric method.

Standards Norway

NS-EN 12135:1997 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
NS-EN 13342:2000 Characterization of sludges — Determination of Kjeldahl nitrogen
NS-EN ISO 8968-1:2001 Milk — Determination of nitrogen content — Part 1: Kjeldahl method (ISO 8968-1:2001)
NS-EN ISO 8968-1:2014 Milk and milk products — Determination of nitrogen content — Part 1: Kjeldahl principle and crude protein calculation (ISO 8968-1:2014)
NS-EN ISO 3188:1994 Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Titrimetric method (ISO 3188:1978)
NS-EN 25663:1993 Water quality — Determination of Kjeldahl nitrogen — Method after mineralization with selenium (ISO 5663:1984)
NS-EN 13654-1:2001 Soil improvers and growing media — Determination of nitrogen — Part 1: Modified Kjeldahl method
NS-EN ISO 5378:1994 Starches and derived products — Determination of nitrogen content by the Kjeldahl method — Spectrophotometric method (ISO 5378:1978)
NS-EN 16169:2012 Sludge, treated biowaste and soil — Determination of Kjeldahl nitrogen
NS-EN ISO 20483:2013 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method (ISO 20483:2013)
NS-EN ISO 20483:2006 Cereals and pulses — Determination of the nitrogen content and calculation of the crude protein content — Kjeldahl method (ISO 20483:2006)

PL-PKN

PN C04576 ArkusZ12-1973 Water and waste water Tests for nitrogenDetermination of total nitrogen of Kjeldahl

Standard Association of Australia （SAA）

AS ISO 8968.1:2021 Milk and milk products — Determination of nitrogen content, Part 1: Kjeldahl principle and crude protein calculation
AS 2300.1.2.1:1988 Methods of chemical and physical testing for the dairying industry, Method 1.2.1: General methods and principles - Determination of nitrogen - Reference Kjeldahl method
AS 1871.11:1976 List of methods for examination of waters Nitrogen (total Kjeldahl incl. ammoniacal)

Bureau of Indian Standards

IS 11917-2018 Milk and Milk Products â€” Determination of Nitrogen Content â€” Kjeldahl Principle and Crude Protein Calculation ( First Revision )
IS 14825-2000 Animal Feeding Stuff - Determination of Nitrogen Content and Calculation of Crude Protein Content - Kjeldahl Method
IS/ISO 5983-1-2005 Animal Feeding stuffs - Determination of nitrogen content and calculation of crude protein content-1 Kjeldahl method

PT-IPQ

NP 1986-1991 Milks Determination of protein content. Kjeldahl technique

AT-ON

ONORM L 1082-1999 Chemical analyses of soils - Determination of nitrogen according to Kjeldahl

BG-BDS

BGC ISO 5983:2001 Animal feeding stuffs - Determination of nitrogen content and calculation of crude protein content - Kjeldahl method

European Committee for Standardization (CEN)

EN 13342:2000 Characterisation of sludges - Determination of Kjeldahl nitrogen
CEN EN 13654-1-2001 Soil Improvers and Growing Media - Determination of Nitrogen - Part 1: Modified Kjeldahl Method

Universal Oil Products Company (UOP)

UOP 384-1976 Nitrogen in Petroleum Distillates and Heavy Oils by Acid Extraction or Direct Kjeldahl Procedure

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