Nitrogen content detection in water

Nitrogen content detection in water, Total:210 items.

The international standard classification for "Nitrogen content detection in water" includes: Fertilizers , Ferroalloys , Organic chemicals , Edible oils and fats. Oilseeds , Tobacco, tobacco products and related equipment , Milk and milk products in general , Inorganic chemicals in general .

The Chinese standard classification for "Nitrogen content detection in water" includes: Basic standards and general methods on chemical fertilizers , Steel and iron alloy analysis method , Organic chemicals in general , Basic standards and general methods , Tobacco, beverage crop and product , Food sanitation , Inorganic chemicals in general , Petroleum products additive in general .

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

GB 8572-1988 Determination of total nitrogen content in compound fertilizer
GB/T 3600-2000 Fertilizers;Determination of ammoniacal nitrogen content;Formaldehyde method
GB/T 34532-2017 Coking wastewater - Determination of ammonia nitrogen content - Formaldehyde method
GB/T 3597-2002 Fertilizer - Determination of nitrate nitrogen content - Nitron gravimetric method
GB/T 42955-2023 Determination of total nitrogen content for fertilizers—Dumas combustion method
GB/T 6625-1986 Test methods for nitrogen content of nitrogen-doped getter
GB/T 24583.3-2019 Vanadium-nitrogen—Determination of nitrogen content—Distillation-neutralization titration method
GB/T 5687.4-2016 Nitrogen-bearing ferrochromium and nitride ferrochrome with high nitrogen content—Determination of nitrogen content—The distillation-neutralization titration method
GB 3597-1983 Determination of nitrate nitrogen content in fertilizers Nitrogen reagent gravimetric method
GB/T 21704-2008 Determination of non-protein-nitrogen content in milk and dairy products
GB/T 24583.3-2019(英文版) 钒氮合金氮含量的测定蒸馏-中和滴定法
GB/T 24583.3-2009 Vanadium-Nitrogen alloy-Determination of nitrogen content—The distillation-neutralization titration method
GB/T 13598-1992 A method for the determination of agricultural chemical residues containing nitrogenous in tobacco leaves
GB/T 17767.1-1999 Determination of total nitrogen content for organic-inorganic compound fertilizers
GB/T 23835.12-2009 Lithium perchlorate anhydrous - Part 12: Determination of total nitrogen content
GB 3598-1983 Fertilizers;Determination of urea nitrogen content;Urease method
GB/T 3598-1983 Fertilizers--Determination of urea nitrogen content--Urease method
SPC GB/T 24583.2-2019 Vanadium-nitrogen -- Determination of nitrogen content -- Thermal conductimetric method after fusion in a current of inert gas (TEXT OF DOCUMENT IS IN CHINESE)
GB/T 9823-2008 Inspection of grain and oils - Determination of total nitrogen content in plant oilseeds residues

Professional Standard - Ferrous Metallurgy

YB/T 4566.2-2016 Ferrovanadium nitride. Determination of nitrogen content. Distillation separation-acid-base neutral titration method
YB/T 4566.5-2016 Ferrovanadium nitride. Determination of silicon content. The sulphuric acid dehydration. gravimetric method
YB/T 4530-2016 Nitrogen-bearing ferromanganese. Determination of nitrogen content. The distillation-neutralization titration method
YB/T 4582.8-2017 Ferrosilicon nitride. Determination of silicon content. Perchloricacid dehydration gravimetric method
YB/T 4582.7-2017 Ferrosilicon nitride-Determination of total nitrogen content-Neutralization titration method

Taiwan Provincial Standard of the People's Republic of China

CNS 4052-1976 Methods for Determination of Nitrite Nitrogen in Polluted and Waste Water
CNS 4051-1976 Methods for Determination of Nitrate Nitrogen in Polluted and Waste Water
CNS 1289-1960 Method of Test for Leather (Nitrogen Content Test)

Professional Standard - Commodity Inspection

SN/T 0840-2015 Determination of nitrogen content of urea for import and export
SN/T 3097-2012 Determination of total nitrogen in fertilizers-Combustion
SN/T 0736.5-1999 Chemical analysis of fertilizers for import and export―Determination of nitrogen content
SN/T 0541.5-2009 Inspecting method of import and export standard rubber - Determination of nitrogen content
SN/T 0840-1999 Method for the determination of nitrogen content of urea for import and export

Professional Standard - Energy

NB/SH/T 6014-2020 Standard test method for nitrogen compounds in middle distillates by gas chromatography-nitrogen chemiluminescence detection

Professional Standard - Agriculture

NY/T 1977-2010 Water-soluble fertilizers--Determination of total nitrogen,phosphorus and potassium content

Professional Standard - Petrochemical Industry

SH/T 0224-1992 Determination method for nitrogen content in petroleum additive (Kjeldahl Method )
SH/T 0413-1992 Determination of minor basic nitrogen in liquid paraffin

Shandong Provincial Standard of the People's Republic of China

DB37/T 2735-2015 Determination of ammonium sulfate content in dry powder fire extinguishing agent Total nitrogen content method
DB37/T 343-2003 Determination method of phosphate content in cod and other aquatic products
DB37/T 4201-2020 Rapid Screening and Detection Method for Chloride Ion Content in Cement

Group Standards of the People's Republic of China

T/GDASE 0009-2020 Determination of the content of carbon, hydrogen, oxygen, nitrogen and sulfur in graphene
T/CPMA 021-2020 Method of on-site detection of ammonia nitrogen in drinking water - Salicylic Acid Method
T/SAASS 197-2025 Liquid nitrogen fertilizer containing medium elements

Xinjiang Provincial Standard of the People's Republic of China

DB65/T 4631.2-2023 Soil testing methods - Determination of available elements - Part 2: Determination of hydrolyzable nitrogen content

Professional Standard - Machinery

JB/T 13306-2017 Superabrasive一Testing method of impurity content in cubic boron nitride

Finnish Standards Institute

SFS 3029 E-1976 In the event of any differences in interpretation of this standard the Finnish version shall take precedence over this translation

British Standards Institution (BSI)

DD ENV 12260-1996 Water quality. Determination of nitrogen. Determination of bound nitrogen, after combustion and oxidation to nitrogen dioxide, using chemiluminescence detection
BS DD CEN/TS 15478:2006 Fertilizers - Determination of total nitrogen in urea
BS EN ISO 13395:1996 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
BS EN ISO 8968-5:2002 Milk. Determination of nitrogen content. Determination of protein-nitrogen content
BS EN 15750:2009 Fertilizers - Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
BS EN 15750:2010 Fertilizers. Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
PD CEN/TS 15750:2008 Fertilizers - Determination of different forms of nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
BS EN ISO 8968-4:2002 Milk. Determination of nitrogen content. Determination of non-protein nitrogen content
BS EN 15558:2009 Fertilizers - Determination of nitric and ammoniacal nitrogen according to Ulsch
BS DD CEN/TS 15561:2007 Fertilizers - Determination of total nitrogen in calcium cyanamide containing nitrates
BS EN 15561:2009 Fertilizers - Determination of total nitrogen in calcium cyanamide containing nitrates
BS EN ISO 8968-1:2002 Milk. Determination of nitrogen content-Kjeldahl method

Magyar Szabványügyi Testület

MSZ 3612/8.lap-1961 Detection of nitrogen content in canned food tomato products
MSZ 12050/7.lap-1968 Definition detection of latex. Nitrogen content
MSZ 279/7-1984 Detection of metal content in food. Detection of cadmium content
MSZ 3612/11-1982 Canned food metal content detection Mercury content detection
MSZ 18284/3-1979 Building stone inspection. Water content detection
MSZ 6116/8-1981 Multifaceted artificial substance detection. All defined nitrogen contents
MNOSZ 260-12.lap-1955 Experiments to detect sewage nitrogen and organic nitrogen
MNOSZ 9627-1952 Oil and paint testing. Water content detection
MSZ 448/16-1987 Drinking water testing, iodide ion content testing
MSZ 305-1957 Metal content and cadmium content detection in food
MSZ 5678-1972 Paper testing. Water pH content
MSZ 14214/12.lap-1968 Aluminum testing in aluminum production. Determination of soluble sodium oxide content in water
MSZ 10192/4-1970 Plastic testing. Hard foam (plastic) water content detection

Swedish Institute for Standards

SS 28133:1991 Determination of the sum of the nitrite and nitrate nitrogen content of water
SS 28101:1992 Nitrogen content of water - Determination with Kjeldahl method after reduction with Devarda's alloy
SIS SS 02 81 33-1991 Determination of the sum of the nitrite and nitrate nitrogen content of water
SS-EN 15478:2009 Fertilizers - Determination of total nitrogen in urea
SS-EN 12135:1998 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
SIS SS 02 81 01-1992 Nitrogen content of water — Determination with Kjeldahl method after reduction with Devarda's alloy

Polski Komitet Normalizacyjny (PKN)

PN C04576 ArkusZ14-1973 Water and wastewater Nitrogen compound content testing Calculation of total nitrogen
PN A86026-1990 Milk and dairy products Milk powdcr Determination of nitritc and nitrate contents
PN Z04075-1961 Speedy Me?hod for De?er mina?ion of Ni?rogen Oxyde* in Air
PN C87077-1992 Nitrogenous fertilizers. Determination of cooper

National Standardisation Body (ASRO)

SR 184-25-1998 Ethyl alcohol. Determination of ammonia and azotic bases nitrogen content
SR ISO 4176:1981 Fertilizers. Determination of nitrate nitrogen content. Nitrogen gravimetric method
STAS 7312-1983 SURFACE AND RESIDUAL WATERS Determination of azote content
STAS 12200-1985 SLUDGES RESULTED FROM= SURFACE WATERS TREATMENT AND WASTE WATERS PURIFI- CATION Nitrogen content determination
STAS 6843-1982 STEELS ANI) CAST 1RONS Determination of nitrogen content
STAS 6182/4-1979 WINE Determination of total nitrogen content
STAS 9065/7-1974 MEAT AND MEAT PRODUCTS Determination of easyly hydrolisable nitrogen content
STAS 7184/2-1985 SOILS Nitrogen content determination

Czech Standards Institute (UNMZ)

CSN 65 4814-1976 Determinaíion of nitrogen oontent in fertilizers
CSN 50 0393-1986 Determination of the content of or- ganic nitrogen in páper and paper- board

American Society for Testing and Materials (ASTM)

ASTM D5475-93(1997) Standard Test Method for Nitrogen- and Phosphorus-Containing Pesticides in Water by Gas Chromatography with a Nitrogen-Phosphorus Detector
ASTM D5475-93(2002) Standard Test Method for Nitrogen- and Phosphorus-Containing Pesticides in Water by Gas Chromatography with a Nitrogen-Phosphorus Detector
ASTM D6016-96(2001) Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
ASTM D6016-96 Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
ASTM RR-D31-1008 1996 D2868-Standard Test Method for Nitrogen Content (Kjeldahl) and Hide Substance Content of Leather

Korean Agency for Technology and Standards (KATS)

KS D 2555-2005 Methods for determination of nitrogen in tantalum
KS D 2530-2007 Methods for determination of nitrogen in titanium and titanium alloys
KS D 1811-2003 Methods for determination of nitrogen in iron and steel
KS D ISO 4945-2002(2017) Steel－Determination of nitrogen content－Spectrophotometric method
KS B 5360-1990 Continuous Analysers for Oxides of Nitrogen in Ambient Air
KS B 5360-2001 Continuous Analysers for Oxides of Nitrogen in Ambient Air
KS M 2112-2011 Crude petroleum and petroleum products-Determination of nitrogen content
KS I ISO 13395:2008 Water quality-Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
KS M ISO 5397-2002(2017) Leather－Determination of nitrogen content and “hide substance”－Titrimetric method
KS M ISO 4176-2006(2011) Fertilizers－Determination of nitrate nitrogen content－Nitron gravimetric method

Indonesia Standards

SNI 19-4780-1998 Cara uji kadar nitrogen amoniak dalam air limbah penyamakan kulit
SNI 13-4721-1998 Methods for determination of total nitrogen content in soils
SNI 06-6323-2000 Determination of total nitrogen content in peat
SNI 2354.8:2009 Cara uji kimia - Bagian 8: Penentuan kadar Total Volatil Base Nitrogen (TVB-N) dan Trimetil Amin Nitrogen (TMA-N) pada produk perikanan
SNI 06-4372-1996 Cara uji kadar hidrazin dalam air boiler
SNI 2354.2:2015 Cara uji kimia - Bagian 2: Pengujian kadar air pada produk perikanan
SNI 03-6791-2002 Test method of cement content in soil-cement mixture by chemistry analysis
SNI 01-2354.2-2006 Cara uji kimia - Bagian 2: Penentuan kadar air pada produk perikanan

Japanese Industrial Standards Committee (JISC)

JIS H 1685:1976 Methods for determination of nitrogen in tantalum
JIS G 1228:1997 Iron and steel -- Methods for determination of nitrogen content
JIS K 0104:2000 Methods for determination of nitrogen oxides in flue gas
JIS K 0104:1984 Methods for determination of oxides of nitrogen in flue gases
JIS K 0104:2011 Methods for determination of nitrogen oxides in flue gas

Gosstandart of Russia

GOST 32459-2013 White phosphorus. Determination in water by gas chromatography with nitrogen-phosphorus detector
GOST EN 15478-2013 Fertilizers. Determination of total nitrogen in urea
GOST 32527-2013 Mineral nitrogen-containing substances. Determination in air and water
GOST 30181.3-1994 Mineral fertilizers. Method for determination of mass fraction of nitrogen in fertilizers with nitrate nitrogen
GOST 30181.6-1994 Mineral fertilizers. Method for determination of mass fraction of nitrogen in ammonium salts (in ammonium form, using the formaldehyde method)
GOST EN 15750-2016 Fertilizers. Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
GOST 8775.4-1987 Lithium. Method of determination of nitrogen
GOST R 51438-1999 Fruit and vegetable juices. Kjeldahl method for determination of nitrogen content
GOST ISO 17234-1-2022 Leather. Chemical tests for the determination of azo colorants in dyed leathers. Part 1. Determination of certain aromatic amines derived from azo colorants
GOST EN 15561-2013 Fertilizers. Determination of total nitrogen in calcium cyanamide containing nitrates
GOST ISO 17234-2-2022 Leather. Chemical tests for the determination of azo colorants in dyed leathers. Part 2. Determination of 4-aminoazobenzene
GOST 21600.6-1983 Ferrochrome. Method for the determination of nitrogen
GOST 15933.11-1970 Ferroniobium. Method for the determination of nitrogen content

Association Francaise de Normalisation

NF U42-191:1988 Fertilizers. Nitrogenous fertilizers containing synthetic organic nitrogen. Determination of the types of nitrogen.
NF T90-015:1975 TESTING WATER-DETERMINATION OF NITROGEN (AMMONIA)
NF U42-503*NF EN 15750:2010 Fertilizers - Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
NF U42-416*NF EN 15478:2009 Fertilizers - Determination of total nitrogen in urea.
NF T90-012*NF EN ISO 13395:1996 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection.
NF V04-221-5:2002 Milk - Determination of nitrogen content - Part 5 : determination of protein-nitrogen content.
NF U42-141:1984 Fertilizers. Determination of nitrate nitrogen content. Nitrogen gravimetric method.
NF U42-147*NF EN 15561:2009 Fertilizers - Determination of total nitrogen in calcium cyanamide containing nitrate
NF V03-032:2024 Foodstuffs - Determination of the nitrogen content by the Kjeldahl method and calculation of the protein content
NF V04-221-4:2002 Milk - Determination of nitrogen content - Part 4 : determination of non-protein nitrogen content.
NF V76-134*NF EN 12135:1997 Fruit and vegetable juices. Determination of nitrogen content. Kjeldahl method.
NF V04-211:1971 MILK. DETERMINATION OF TOTAL NITROGEN CONTENT. (KJELDAHL METHOD).
NF X43-009:1973 Nitrogen dioxyde content of the atmosphere (griess saltzman reaction).

Tunisia Institut National de la Normalisation et de la Propriété Industrielle

NT 14.33-1983 Determination of all nitrogen contents in milk

Argentine Institute of Standardization

IRAM 14 522-1961 How to measure nitrogen content in beer

Ente Nazionale Italiano di Unificazione

UNI EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Determination of protein- nitrogen content
UNI EN 12135:1999 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
UNI EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Determination of non-protein nitrogen content
UNI EN ISO 4945:2009 Steel - Determination of nitrogen content - Spectrophotometric method
UNI EN ISO 4945:2019 Steel - Determination of nitrogen - Spectrophotometric method

Spanish Association for Standardization (UNE)

UNE-EN 12135:1998 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
UNE 36317-1:1985 DETERMINATION OF NITROGEN CONTENT OF STEELS. SPECTROPHOTOMETRIC METHOD
UNE-CEN/TS 17762:2022 Inorganic fertilizers - Determination of the copper content in ammonium nitrate fertilizers of high nitrogen content (Endorsed by Asociación Española de Normalización in May of 2022.)
UNE-CEN/TS 17761:2022 Inorganic fertilizers - Determination of the chloride content in ammonium nitrate fertilizers of high nitrogen content (Endorsed by Asociación Española de Normalización in May of 2022.)
UNE-EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content. (ISO 8968-5:2001)
UNE 59-018-1986 leather. Determination of nitrogen content in cortex. Volume determination

Standards Norway

NS-EN 12135:1997 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method
NS 4865:1983 Air quality — Determination of the sum of nitrite- and nitrate-nitrogen in precipitation

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 CEN/TS 15558:2007 Fertilizers - Determination of nitric and ammoniacal nitrogen according to Ulsch; German version CEN/TS 15558:2007
DIN CEN/TS 15750:2008 Fertilizers - Determination of total nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods; German version CEN/TS 15750:2008
DIN EN 12260:2003 Water quality - Determination of nitrogen - Determination of bound nitrogen (TN<(Index)b>), following oxidation to nitrogen oxides; German version EN 12260:2003
DIN EN 10179:2024-10 Steels - Determination of nitrogen (trace amounts) - Spectrophotometric method
DIN EN ISO 11905-1:1998 Water quality - Determination of nitrogen - Part 1: Method using oxidative digestion with peroxodisulfate (ISO 11905-1:1997); German version EN ISO 11905-1:1998
DIN CEN/TS 15559:2007 Fertilizers - Determination of nitric and ammoniacal nitrogen according to Arnd; German version CEN/TS 15559:2007
DIN EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of the non-protein-nitrogen content (ISO 8968-4:2001); German version EN ISO 8968-4:2001
DIN EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content (ISO 8968-5:2001); German version EN ISO 8968-5:2001
DIN 53308:1968 Testing of leather; determination of the contents of total nitrogen and of ammonium salts, calculation of hide substance
DIN CEN/TS 15561:2007 Fertilizers - Determination of total nitrogen in calcium cyanamide containing nitrates; German version CEN/TS 15561:2007

Danish Standards Foundation

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
DS/EN ISO 8968-4:2002 Milk - Determination of nitrogen content - Part 4: Determination of non-protein nitrogen content
DS/EN ISO 8968-5:2002 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
DS/EN 10179:1989 Chemical analysis of ferrous materials. Determination of nitrogen (trace amount) in steels. Spectrophotometric method

Lithuanian Standards Office

LST EN 12135-2001 Fruit and vegetable juices - Determination of nitrogen content - Kjeldahl method

Netherlands Institute for Standardization

NEN 6642-1992 Water-Calculation of total nitrogen content

COMMISSION FOR THE STANDARDS, METROLOGY AND QUALITY OF VIETNAM (STAMEQ)

TCVN 3706-1990 Aquatic products.Method for the determination of nitrogen ammonia content
TCVN 3707-1990 Aquatic products.Method for the determination of amine ammonia nitrogen content
TCVN 3708-1990 Aquatic products.Method for the determination of nitrogen amino acid content
TCVN 3705-1990 Aquatic products.Method for the determination of total nitrogen and protein content

Portuguese Institute of Quality

NP EN 12135-2000 Fruit and vegetable juices Determination of nitrogen content Kjeldahl method
NP 3646-1987 fertilizer. Measurement of total nitrogen content
E 211-1967 water. Determination of the percentage content of nitrogen and ammonia components (transparent step)

Yugoslav Association for Standardization

JUS F.S2.011-1989 Testing of textiles. Detennination of moisture regain in wool
JUS H.G8.447-1990 Reagents. Zine sulphate heptahydrate. Determination of total nitrogen content. Colorimetric method

Universal Oil Products Company (UOP)

UOP 936-2020 Combined Nitrogen in LPG including Propylene by Chemiluminescence

International Organization for Standardization (ISO)

ISO 8968-5:2001|IDF 20-5:2001 Determination of milk nitrogen content Part 5: Determination of protein nitrogen content
ISO 8968-4:2001 | IDF 20-4:2001 Milk — Determination of nitrogen content — Part 4: Determination of non-protein-nitrogen content
ISO 8968-5:2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
ISO 8968-5:2001 | IDF 20-5:2001 Milk — Determination of nitrogen content — Part 5: Determination of protein-nitrogen content
ISO 8968-4:2001 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content
ISO 8968-4:2001|IDF 20-4:2001 Determination of milk nitrogen content Part 4: Determination of non-protein nitrogen content
ISO 13395:1996 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection

GCC Standardization Organization

GSO ISO 8968-5:2014 Milk -- Determination of nitrogen content -- Part 5: Determination of protein-nitrogen content

Associação Brasileira de Normas Técnicas

ABNT MB-1133-1979 Use the Devada aluminum-copper-zinc alloy test method to detect nitrogen and ammonia-containing nitrogen compounds in fertilizers

International Dairy Federation (IDF)

IDF 20-5-2001 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
IDF 20-4-2001 Milk - Determination of nitrogen content - Part 4: Determination of non-protein-nitrogen content

South African Bureau of Standard

SANS 8968-5:2006 Milk - Determination of nitrogen content - Part 5: Determination of protein-nitrogen content
SANS 13395:1996 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
SANS 8968-4:2006 Milk - Determination of nitrogen content Part 4: Determination of non-protein-nitrogen content
SANS 333:1996 Coal - Determination of nitrogen - Semi-micro Kjeldahl method
SANS 5386:1987 Potassium in solutions, detection
SANS 5287:1975 Calcium in solutions, detection

The Directorate General of Specifications and Metrology (DGSM)

OS GSO ISO 8968-5:2014 Milk -- Determination of nitrogen content -- Part 5: Determination of protein-nitrogen content

European Committee for Standardization (CEN)

EN ISO 13395:1996 Water Quality - Determination of Nitrite Nitrogen and Nitrate Nitrogen and the Sum of Both by Flow Analysis (CFA and FIA) and Spectrometric Detection
EN ISO 8968-4:2001 Milk - Determination of Nitrogen Content - Part 4: Determination of Non-Protein Nitrogen Content

Fondo para la Normalización y Certificación de la Calidad Venezuela, République bolivarienne du

NORVEN 378 Regulation of nitrogen content in cocoa beans

Belgian Standards Institute

NBN V 21-013-1978 Determination of the total nitrogen contaimng substances content of milk - Amido black method

National Sanitation Foundation (NSF)

NSF 245A-2010 Wastewater Treatment Systems - Nitrogen Reduction