Water quality nitrate nitrogen detection method

Water quality nitrate nitrogen detection method, Total:154 items.

In the international standard classification, Water quality nitrate nitrogen detection method involves: Environmental testing, Water quality, Soil quality. Pedology, Farming and forestry, Biology. Botany. Zoology, Fertilizers, Construction materials, Test conditions and procedures in general, Non-metalliferous minerals, Vocabularies, Beverages, Cutting tools, Fuels, Wind turbine systems and other alternative sources of energy, Products of the textile industry, Inorganic chemicals, Geology. Meteorology. Hydrology, Products of the chemical industry.

Indonesia Standards, Water quality nitrate nitrogen detection method

SNI 19-6964.7-2003 Seawater quality - Part 7: Test methods of nitrates (NO3-N) with cadmium reduction by spectrophotometry
SNI 19-1662-1989 Water and waste water, Test method for nitrite content
SNI 06-2413-2002 Test methods for solid matter content in water
SNI 03-6817-2002 Test methods of water quality for being used in concretes

Japanese Industrial Standards Committee (JISC), Water quality nitrate nitrogen detection method

JIS K 0170-2:2011 Testing methods for water quality by flow analysis -- Part 2: Nitrite nitrogen and nitrate nitrogen
JIS K 0170-2:2019 Testing methods for water quality by flow analysis -- Part 2: Nitrite nitrogen and nitrate nitrogen
JIS K 0170-1:2011 Testing methods for water quality by flow analysis -- Part 1: Ammonium nitrogen
JIS K 0170-1:2019 Testing methods for water quality by flow analysis -- Part 1: Ammonium nitrogen
JIS K 0400-44-40:2000 Water quality -- Determination of Kjeldahl nitrogen -- Method after mineralization with selenium
JIS K 0170-3:2011 Testing methods for water quality by flow analysis -- Part 3: Total nitrogen
JIS K 0170-3:2019 Testing methods for water quality by flow analysis -- Part 3: Total nitrogen

Association Francaise de Normalisation, Water quality nitrate nitrogen detection method

NF EN ISO 13395:1996 Water quality - Determination of nitrous nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
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 EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Solid phase extraction method with detection by gas chromatography and mass spectrometry
NF EN ISO 11732:2005 Water quality - Determination of ammoniacal nitrogen - Flow analysis method (CFA and FIA) and spectrometric detection
NF T90-080:1997 Water quality - Determination of ammonium nitrogen by flow analysis (CFA and FIA) and spectrometric detection.
NF T90-042:1995 Water quality - Determination of dissolved fluoride, chloride, nitrite, orthophosphate, bromide, nitrate and sulfate ions, using liquid chromatography of ions - Part 1 : method for water with low contamination.
NF T90-181*NF EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Method by solid phase extraction and gas chromatography with mass spectrometric detection.
NF EN ISO 787-19:2020 Méthodes générales d'essais des pigments - Partie 19 : détermination des nitrates solubles dans l'eau (Méthode à l'acide salicylique)

Korean Agency for Technology and Standards (KATS), Water quality nitrate nitrogen detection method

KS I ISO 13395-2018 Water quality－Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
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 I ISO 11732-2023 Water quality — Determination of ammonium nitrogen — Method by flow analysis (CFA and FIA) and spectrometric detection
KS I 3220-2007 Water quality－Determination of nitrate
KS I ISO 13395-2008(2018) Water quality－Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
KS I ISO 11905-2-2008(2013) Water quality－Determination of nitrogen－Part 2：Determination of bound nitrogen, after combustion and oxidation to nitrogen dioxide, using chemiluminescence detection
KS I ISO 16266:2007 Water quality－Detection and enumeration of Pseudomonas aeruginosa－Method by membrane filtration
KS I ISO 17495-2007(2017) Water quality－Determination of selected nitrophenols－Method by solidphase extraction and gas chromatography with mass spectrometric detection
KS I ISO 11732-2008(2018) Water quality－Determination of ammonium nitrogen－Method by flow analysis(CFA and FIA) and spectrometric detection
KS I ISO 14238:2008 Soil quality-Biological methods-Determination of nitrogen mineralization and nitrification in soils and the influence of chemicals on these processes

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, Water quality nitrate nitrogen detection method

GB/T 42487-2023 Soil quality Determination of soil nitrate nitrogen, nitrite nitrogen and ammonium nitrogen potassium chloride solution leaching flow analysis method
GB/T 42485-2023 Soil quality Determination of soil nitrate nitrogen, nitrite nitrogen and ammonium nitrogen
GB/T 18856.12-2002 Test methods for quality of coal water mixture--Part 12: Determination of nitrogen of coal water mixture
GB/T 17592.1-1998 Textiles--Test method of the use of banned azo colourants--Gas chromatography/mass spectrography method

Professional Standard - Urban Construction, Water quality nitrate nitrogen detection method

CJ 26.26-1991 Municipal sewage water quality inspection method standard Determination of nitrite nitrogen spectrophotometric method
CJ 26.25-1991 Determination of Standard Ammonia Nitrogen in Municipal Sewage Water Quality Inspection Method
CJ 26.27-1991 Municipal sewage water quality inspection method standard Determination of total nitrogen Titration method after distillation
CJ 26.13-1991 Municipal sewage water quality test method Determination of standard aniline Azo spectrophotometric method

PL-PKN, Water quality nitrate nitrogen detection method

PN C04576-10-1986 Water and waste water Tests for nitrogen Determination of nitrate nitrogen by potentiometric method with ion selective electrode

Tianjin Provincial Standard of the People's Republic of China, Water quality nitrate nitrogen detection method

DB12/T 512-2014 Determination method of nitrate nitrogen in soil samples

Group Standards of the People's Republic of China, Water quality nitrate nitrogen detection method

T/ZFL 022-2023 Detection method of nitrate nitrogen and ammonium nitrogen uptake in root hair cells of Arabidopsis thaliana based on non-invasive micro-measurement technology
T/ZFL 022-2022 Detection method of nitrate nitrogen and ammonium nitrogen uptake in root hair cells of Arabidopsis thaliana based on non-invasive micro-measurement technology
T/XMTIC 0001-2024 Rapid method for the determination of nitrite in water
T/NAIA 0247-2023 Determination of water quality nitrate nitrogen by continuous flow analysis method
T/NAIA 0248-2023 Determination of nitrite nitrogen in water quality by continuous flow analysis method
T/CHES 13-2017 Water Quality Determination of Nitrate Nitrogen Gas Phase Molecular Absorption Spectrometry
T/CHES 14-2017 Water Quality Determination of Nitrite Nitrogen Gas Phase Molecular Absorption Spectrometry

SCC, Water quality nitrate nitrogen detection method

DANSK DS/EN ISO 13395:1997 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
AS 1871.11:1976 List of methods for examination of waters Nitrogen (total Kjeldahl incl. ammoniacal)
AS 1871.10:1976 List of methods for examination of waters Nitrogen (ammonia)
DANSK DS/EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection
NS-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 (ISO 13395:1996)
BS DD CEN/TS 15750:2006 Fertilizers. Determination of different forms of nitrogen in fertilizers containing nitrogen only as nitric, ammoniacal and urea nitrogen by two different methods
AS 1871.9:1976 List of methods for examination of waters Nitrogen (albuminoid)
AENOR UNE-EN ISO 13395:1997 WATER QUALITY. DETERMINATION OF NITRITE NITROGEN AND NITRATE NITROGEN AND THE SUM OF BOTH BY FLOW ANALYSIS (CFA AND FIA) AND SPECTROMETRIC DETECTION. (ISO 13395:1996).
NS-EN ISO 11732:2005 Water quality — Determination of ammonium nitrogen — Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005)
UNE 77028:2002 Water quality. Determination of ammonium nitrogen. Destillation and titrimetric method, or colorimetric method.
BS EN ISO 11732:1997 Water quality. Determination of ammonium nitrogen by flow analysis (CFA and FIA) and spectrometric detection
AAMI TIR58:2014 Water testing methodologies
AAMI TIR58:2021 Water testing methodologies
NS-EN ISO 11732:1997 Water quality — Determination of ammonium nitrogen by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:1997)
BS DD ENV 12260:1996 Water quality. Determination of nitrogen. Determination of bound nitrogen, after combustion and oxidation to nitrogen dioxide, using chemiluminescence detection
DANSK DS/EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection
DANSK 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
NS-EN ISO 17495:2003 Water quality — Determination of selected nitrophenols — Method by solid-phase extraction and gas chromatography with mass spectrometric detection (ISO 17495:2001)
AENOR UNE-EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection (ISO 17495:2001)
DANSK DS/ISO 29441:2010 Water quality - Determination of total nitrogen after UV digestion - Method using flow analysis (CFA and FIA) and spectrometric detection

British Standards Institution (BSI), Water quality nitrate nitrogen detection method

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 11732:2005 Water quality. Determination of ammonium nitrogen. Method by flow analysis (CFA and FIA) and spectrometric detection
BS EN ISO 13395:1996(1998) Water quality — Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
BS ISO 23695:2023 Water quality. Determination of ammonium nitrogen in water. Small-scale sealed tube method
21/30396472 DC BS ISO 23695. Water quality. Determination of ammonium nitrogen in water. Small-scale sealed tube method
BS DD CEN/TS 15750:2009 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 17495:2003(2008) Water quality — Determination of selectednitrophenols — Method by solid - phase extraction and gas chromatography with mass spectrometric detection
DD ENV 12260-1996 Water quality. Determination of nitrogen. Determination of bound nitrogen, after combustion and oxidation to nitrogen dioxide, using chemiluminescence detection
BS 6068-2.36:1989 Water quality. Physical, chemical and biochemical methods. Spectrometric method for the determination of nitrate using sulphosalicylic acid
BS ISO 22863-10:2021 Fireworks. Test methods for determination of specific chemical substances. Nitrogen content in nitrocellulose by iron(II) sulfate titration

European Committee for Standardization (CEN), Water quality nitrate nitrogen detection method

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
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
EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005)
EN ISO 16266-2:2021 Water quality - Detection and enumeration of Pseudomonas aeruginosa - Part 2: Most probable number method (ISO 16266-2:2018)

International Organization for Standardization (ISO), Water quality nitrate nitrogen detection method

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
ISO 23695:2023 Water quality — Determination of ammonium nitrogen in water — Small-scale sealed tube method
ISO 16266:2006 Water quality - Detection and enumeration of Pseudomonas aeruginosa - Method by membrane filtration
ISO 14238:1997 Soil quality - Biological methods - Determination of nitrogen mineralization and nitrification in soils and the influence of chemicals on these processes
ISO 16266-2:2018 Water quality - Detection and enumeration of Pseudomonas aeruginosa - Part 2: Most probable number method
ISO 8360-1:1988 Water quality; detection and enumeration of Pseudomonas aeruginosa; part 1: method by enrichment in liquid medium

ZA-SANS, Water quality nitrate nitrogen detection method

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 11732:2006 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection
SANS 17495:2002 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection

Danish Standards Foundation, Water quality nitrate nitrogen detection method

DS/EN ISO 13395:1997 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
DS/EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection
DS/EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection
DS/ISO 29441:2010 Water quality - Determination of total nitrogen after UV digestion - Method using flow analysis (CFA and FIA) and spectrometric detection

German Institute for Standardization, Water quality nitrate nitrogen detection method

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 ISO 13395:1996-12 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection (ISO 13395:1996); German version EN ISO 13395:1996
DIN EN ISO 11732:2005-05 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005); German version EN ISO 11732:2005
DIN 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 (ISO 13395:1996); German version EN ISO 13395:1996
DIN EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005); German version EN ISO 11732:2005
DIN 19746:2005-06 Soil quality - Determination of mineral nitrogen (nitrat and ammonium) in soil profiles (Nmin laboratory method)
DIN EN ISO 17495:2003-09 Water quality - Determination of selected nitrophenols - Method by solid phase extraction and gas chromatography with mass spectrometric detection (ISO 17495:2001); German version EN ISO 17495:2003
DIN 19746:2005 Soil quality - Determination of mineral nitrogen (nitrat and ammonium) in soil profiles (Nmin laboratory method)
DIN EN 25663:1993-11 Water quality; determination of Kjeldahl nitrogen; method after mineralization with selenium (ISO 5663:1984); German version EN 25663:1993

BE-NBN, Water quality nitrate nitrogen detection method

NBN T 91-256-1977 Water analysis methods - Determination of the nitrate nitrogen -Photometric method with chromotropic acid

Xinjiang Provincial Standard of the People's Republic of China, Water quality nitrate nitrogen detection method

DB65/T 602.4-2001 The determinanation of nitrate nitrogen in soil

中华人民共和国环境保护部, Water quality nitrate nitrogen detection method

GB 7493-1987 Water quality-Determination of nitrogen (nitrite)-Spectrophotometric method
GB 7480-1987 Water quality-Determination of nitrate-Spectrophotometric method with phenol disulfonic acid

Lithuanian Standards Office , Water quality nitrate nitrogen detection method

LST EN ISO 13395:2000 Water quality - Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection (ISO 13395:1996)
LST EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005)
LST EN ISO 17495:2004 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection (ISO 17495:2001)

American Society for Testing and Materials (ASTM), Water quality nitrate nitrogen detection method

ASTM D1426-98 Standard Test Methods for Ammonia Nitrogen In Water
ASTM D1426-03 Standard Test Methods for Ammonia Nitrogen In Water
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 E410-08 Standard Test Method for Moisture and Residue in Liquid Chlorine

GSO, Water quality nitrate nitrogen detection method

OS GSO ISO 13395:2013 Water quality -- Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
OS GSO ISO 11732:2015 Water quality -- Determination of ammonium nitrogen -- Method by flow analysis (CFA and FIA) and spectrometric detection
BH GSO ISO 11732:2016 Water quality -- Determination of ammonium nitrogen -- Method by flow analysis (CFA and FIA) and spectrometric detection
GSO ISO 11732:2015 Water quality -- Determination of ammonium nitrogen -- Method by flow analysis (CFA and FIA) and spectrometric detection
GSO ISO 13395:2013 Water quality -- Determination of nitrite nitrogen and nitrate nitrogen and the sum of both by flow analysis (CFA and FIA) and spectrometric detection
OS GSO ISO 17495:2013 Water quality -- Determination of selected nitrophenols -- Method by solid-phase extraction and gas chromatography with mass spectrometric detection
GSO ISO 17495:2013 Water quality -- Determination of selected nitrophenols -- Method by solid-phase extraction and gas chromatography with mass spectrometric detection
BH GSO ISO 17495:2016 Water quality -- Determination of selected nitrophenols -- Method by solid-phase extraction and gas chromatography with mass spectrometric detection
OS GSO ISO 29441:2013 Water quality -- Determination of total nitrogen after UV digestion -- Method using flow analysis (CFA and FIA) and spectrometric detection
GSO ISO 29441:2013 Water quality -- Determination of total nitrogen after UV digestion -- Method using flow analysis (CFA and FIA) and spectrometric detection

AENOR, Water quality nitrate nitrogen detection method

UNE-EN ISO 13395:1997 WATER QUALITY. DETERMINATION OF NITRITE NITROGEN AND NITRATE NITROGEN AND THE SUM OF BOTH BY FLOW ANALYSIS (CFA AND FIA) AND SPECTROMETRIC DETECTION. (ISO 13395:1996).
UNE-EN ISO 11732:2005 Water quality - Determination of ammonium nitrogen - Method by flow analysis (CFA and FIA) and spectrometric detection (ISO 11732:2005)
UNE-EN 25663:1994 WATER QUALITY. DETERMINATION OF KJELDAHL NITROGEN. METHOD AFTER MINERALIZATION WITH SELENIUM. (ISO 5663:1984).
UNE-EN ISO 17495:2003 Water quality - Determination of selected nitrophenols - Method by solid-phase extraction and gas chromatography with mass spectrometric detection (ISO 17495:2001)

RU-GOST R, Water quality nitrate nitrogen detection 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 33045-2014 Water. Methods for determination of nitrogen-containing matters
GOST 4192-1982 Drinking water. Methods for determination of mineral nitrogen-containing matters

Professional Standard - Environmental Protection, Water quality nitrate nitrogen detection method

HJ/T 198-2005 Water quality - Determination of nitrate-nitrogen Gas-phase molecular absorption spectrometry
HJ/T 346-2007 Water quality. Determination of nitrate-nitrogen. Ultraviolet spectrophotometry
HJ/T 197-2005 Water quality - Determination of nitrite-nitrogen Gas-phase molecular absorption spectrometry
HJ 101-2019 Ammonia nitrogen water quality online automatic monitor technical requirements and detection methods

Professional Standard - Geology, Water quality nitrate nitrogen detection method

DZ/T 0064.60-1993 Spectrophotometric method for determination of nitrite radicals in groundwater quality testing
DZ/T 0064.59-1993 Groundwater Quality Examination Method Determination of Nitrate by Ultraviolet Spectrophotometry
DZ/T 0064.23-1993 Groundwater quality testing method Determination of iron by phenanthrene spectrophotometry
DZ/T 0064.58-1993 Groundwater Quality Test Method for Determination of Nitrate by Disulfonic Acid Phenol Spectrophotometry
DZ/T 0064.51-1993 Groundwater quality testing methods - Determination of chloride, fluoride, bromide, nitrate and sulfate by ion chromatography

YU-JUS, Water quality nitrate nitrogen detection method

JUS H.Z1.137-1985 Testing of industrial vvaters. Determination of nitrite-nitrate and the combined nitrite-nitrate nitrogen, Spectrophotometric method

Taiwan Provincial Standard of the People's Republic of China, Water quality nitrate nitrogen detection method

CNS 12630-2004 Method of test for fruit and vegetable juices and drinks－Determination of formol nitrogen

CEN - European Committee for Standardization, Water quality nitrate nitrogen detection method

EN ISO 11732:1997 Water Quality - Determination of Ammonium Nitrogen by Flow Analysis (CFA and FIA) and Spectrometric Detection

工业和信息化部/国家能源局, Water quality nitrate nitrogen detection method

JB/T 13306-2017 Method for detecting impurity content in superabrasive cubic boron nitride

Professional Standard - Commodity Inspection, Water quality nitrate nitrogen detection method

SN/T 0280-2012 Determination of dicloran residues in fruits for export

AT-ON, Water quality nitrate nitrogen detection method

ONORM M 6248-1988 Water quality; determlnation of Kjeldabl nitrogen; method ajter mineralization with selenium

Hunan Provincial Standard of the People's Republic of China, Water quality nitrate nitrogen detection method

DB43/T 1482-2018 Forest Ecosystem Water Quality Observation Method

Liaoning Provincial Standard of the People's Republic of China, Water quality nitrate nitrogen detection method

DB21/T 1820-2010 Forest Ecosystem Water Quality Observation Method

KR-KS, Water quality nitrate nitrogen detection method

KS I ISO 17495-2023 Water quality — Determination of selected nitrophenols — Method by solid-phase extraction and gas chromatography with mass spectrometric detection

VN-TCVN, Water quality nitrate nitrogen detection method

TCVN 3705-1990 Aquatic products.Method for the determination of total nitrogen and protein content

Professional Standard - Railway, Water quality nitrate nitrogen detection method

TB/T 2819-1997 Quality status detection and evaluation method of seamless line

国家能源局, Water quality nitrate nitrogen detection method

SY/T 7436-2019 Separation and detection method of neutral nitrogen compounds in petroleum geological samples

Professional Standard - Ocean, Water quality nitrate nitrogen detection method

HY/T 271-2018 Testing methods of marine multi-parameter water-quality monitoring instrument