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Nitrogen Medium Micro

Nitrogen Medium Micro, Total:139 items.

In the international standard classification, Nitrogen Medium Micro involves: Coals, Analytical chemistry, Sugar. Sugar products. Starch, Fertilizers, Photography, Wastes, Animal feeding stuffs, General methods of tests and analysis for food products, Meat, meat products and other animal produce, Fuels, Products of the chemical industry, Biology. Botany. Zoology, Leather technology, Water quality, Paint ingredients, Beverages, Conducting materials, Ferrous metals, Testing of metals, Document imaging applications, Microbiology, Powder metallurgy, Organic chemicals, Petroleum products in general, Construction industry, Soil quality. Pedology, Rubber and plastics products, Laboratory medicine, Elements of buildings, Metalliferous minerals, Quality, Raw materials for rubber and plastics.


Korean Agency for Technology and Standards (KATS), Nitrogen Medium Micro

  • KS E ISO 333:2003 Coal-Determination of nitrogen-Semi-micro Kjeldahl method
  • KS E ISO 333-2003(2013) Coal-Determination of nitrogen-Semi-micro Kjeldahl method
  • KS M ISO 6851-2002(2017) Photography-Processing waste-Determination of total amino nitrogen-Microdiffusion Kjeldahl method
  • KS M ISO 6851:2002 Photography-Processing waste-Determination of total amino nitrogen-Microdiffusion Kjeldahl method
  • KS M ISO 6851-2002(2022) Photography-Processing waste-Determination of total amino nitrogen-Microdiffusion Kjeldahl method
  • KS M ISO 17234-2:2019 Leather — Chemical tests for the determination of certain azo colorants in dyed leathers — Part 2: Determination of 4-aminoazobenzene
  • KS M ISO 17234-2:2014 Leather — Chemical tests for the determination of certain azo colorants in dyed leathers — Part 2: Determination of 4-aminoazobenzene
  • KS D 1700-2004 Determination of trace impurities in high purity gold-Matrix extraction method of fuming using sulfuric acid
  • KS I ISO 23753-1:2021 Soil quality — Determination of dehydrogenases activity in soils —Part 1: Method using triphenyltetrazolium chloride(TTC)
  • KS D 1700-2009 Determination of trace impurities in high purity gold-Matrix extraction method of fuming using sulfuric acid
  • KS I ISO 6222:2019 Water quality ― Enumeration of culturable micro-organisms ― Colony count by inoculation in a nutrient agar culture medium

International Organization for Standardization (ISO), Nitrogen Medium Micro

  • ISO 333:1983 Coal; Determination of nitrogen; Semi-micro Kjeldahl method
  • ISO 17234-2:2011 | IULTCS/IUC 20-2 Leather — Chemical tests for the determination of certain azo colorants in dyed leathers — Part 2: Determination of 4-aminoazobenzene
  • ISO 4507:2000 Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test
  • ISO 20130:2018 Soil quality - Measurement of enzyme activity patterns in soil samples using colorimetric substrates in micro-well plates
  • ISO 6222:1988 Water quality — Enumeration of viable micro-organisms — Colony count by inoculation in or on a nutrient agar culture medium
  • ISO 23697-1:2023 Water quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes — Part 1: Dimethylphenol colour reaction

British Standards Institution (BSI), Nitrogen Medium Micro

  • BS ISO 6851:2001 Photography. Processing waste. Determination of total amino nitrogen (microdiffusion Kjeldahl method)
  • BS DD CEN/TS 15604:2007 Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen
  • DD CEN/TS 15604:2007 Fertilizers — Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen
  • BS EN 15604:2009 Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen
  • BS ISO 6851:2002 Photography - Processing waste - Determination of total amino nitrogen (microdiffusion Kjeldahl method)
  • BS EN ISO 9509:2006 Water quality - Toxicity test for assessing the inhibition of nitrification of activated sludge microorganisms
  • BS EN ISO 4507:2000 Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test
  • BS ISO 23697-1:2023 Water quality. Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes - Dimethylphenol colour reaction
  • BS EN ISO 23753-1:2011 Soil quality. Determination of dehydrogenase activity in soil. Method using triphenyltetrazolium chloride (TTC)
  • BS PD CEN/TS 17403:2021 Fertilizers. Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with
  • 21/30426875 DC BS ISO 23697-1. Water quality. Determination of total nitrogen (TNb) in water using small-scale sealed tubes. Part 1. Dimethylphenol based method

VN-TCVN, Nitrogen Medium Micro

  • TCVN 6014-2007 Hard coal.Determination of nitrogen.Semi-micro Kjeldahl method

Hunan Provincial Standard of the People's Republic of China, Nitrogen Medium Micro

  • DB43/T 751-2013 Determination of Nitrogen in Graphite by Semi-Micro Kelvin Method

Professional Standard - Light Industry, Nitrogen Medium Micro

RU-GOST R, Nitrogen Medium Micro

  • GOST EN 15604-2013 Fertilizers. Determination of different forms of nitrogen in the same sample: nitric, ammoniacal, cyanamide and urea nitrogen
  • GOST R ISO 17234-2-2015 Leather. Chemical tests for the determination of certain azo colorants in dyed leathers. Part 2. Method for determination of 4-aminoazobenzene

American Society for Testing and Materials (ASTM), Nitrogen Medium Micro

  • ASTM E147-61(1996) Standard Specification for Apparatus For Microdetermination Of Nitrogen By Kjeldahl Method
  • ASTM E147-61(2001) Standard Specification for Apparatus For Microdetermination Of Nitrogen By Kjeldahl Method
  • ASTM E147-61(2006) Standard Specification for Apparatus For Microdetermination Of Nitrogen By Kjeldahl Method
  • ASTM E147-61(2011) Standard Specification for Apparatus for Microdetermination of Nitrogen by Kjeldahl Method
  • ASTM D3590-02(2006) Standard Test Methods for Total Kjeldahl Nitrogen in Water
  • ASTM D3590-89(1994)e1 Standard Test Methods for Total Kjeldahl Nitrogen in Water
  • ASTM D4954-89(2003) Standard Test Method for Determination of Nitrilotriacetates in Detergents
  • ASTM UOP269-10 Nitrogen Bases in Hydrocarbons by Potentiometric Titration
  • ASTM D4954-89(2009) Standard Test Method for Determination of Nitrilotriacetates in Detergents
  • ASTM E258-07 Standard Test Method for Total Nitrogen in Organic Materials by Modified Kjeldahl Method
  • ASTM D8301-21 Standard Test Method for Determination of the Content of Nitroxide Radical (4-Hydroxy-2,2,6,6-tetramethylpiperidine-1-oxyl) in Butadiene, Styrene and Isoprene by Cyclic Voltammetry Method
  • ASTM E1969-98 Standard Guide for Microcrystal Testing in the Forensic Analysis of Methamphetamine and Amphetamine
  • ASTM E1969-01 Standard Guide for Microcrystal Testing in the Forensic Analysis of Methamphetamine and Amphetamine
  • ASTM E196-95(2000)e1 Standard Practice for Gravity Load Testing of Floors and Low Slope Roofs
  • ASTM E1969-11 Standard Guide for Microcrystal Testing in the Forensic Analysis of Methamphetamine and Amphetamine
  • ASTM E1969-06 Standard Guide for Microcrystal Testing in the Forensic Analysis of Methamphetamine and Amphetamine
  • ASTM D5376-06(2017) Standard Test Method for Rubber Compounding Materials&x2014;Determination of the Basic Nitrogen Content in Rubber Antioxidant: Polymerized TMQ

Professional Standard - Petrochemical Industry, Nitrogen Medium Micro

  • SH/T 0413-1992 Determination of Trace Basic Nitrogen Content in Liquid Paraffin
  • SH/T 1769-2009 Polyethylene for industrial use-Determination of trace carbonyl sulfide-Gas chromatographic method
  • SH/T 1547-2004 1-Butene for industrial use--Determination of trace methanol and methyl tert-butyl ether--Gas chromatographic method
  • SH/T 1547-1993 Determination of trace amounts of methanol and methyl tert-butyl ether in industrial 1-butene by gas chromatography
  • SH/T 1493-2015 C<下标4> Olefins.Determination of trace carbonyls.Spectrophotometric method
  • SH/T 1493-1992 Determination of trace carbonyl compounds in 1-butene for industrial use Spectrophotometric method

German Institute for Standardization, Nitrogen Medium Micro

  • DIN CEN/TS 15604:2008 Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen; German version CEN/TS 15604:2007
  • DIN 51722-1:1990 Testing of solid fuels; determination of nitrogen content; semi-micro Kjeldahl method
  • DIN EN ISO 17234-2:2011-06 Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene (ISO 17234-2:2011); German version EN ISO 17234-2:2011
  • DIN 10115:2020-12 Fundamentals for detection and determination of microorganisms in foodstuffs with impedance-method
  • DIN EN ISO 4507:2007 Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test (ISO 4507:2000)English version of DIN EN ISO 4507:2007-05
  • DIN 10115:2020 Fundamentals for detection and determination of microorganisms in foodstuffs with impedance-method
  • DIN 10115:1999 Fundamentals for detection and determination of microorganisms in foodstuffs with impedance-method
  • DIN CEN/TS 17403:2021-03 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution w...
  • DIN EN ISO 17234-2:2011 Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene (ISO 17234-2:2011); German version EN ISO 17234-2:2011

Association Francaise de Normalisation, Nitrogen Medium Micro

  • NF U42-149*NF EN 15604:2009 Fertilizers - Determination of different forms of nitrogen in the same sample, containing nitrogen as nitric, ammoniacal, urea and cyanamide nitrogen
  • NF EN ISO 14362-3:2017 Textiles - Méthodes de détermination de certaines amines aromatiques dérivées de colorants azoïques - Partie 3 : détection de l'utilisation de certains colorants azoïques susceptibles de libérer du 4-aminoazobenzène
  • NF EN ISO 17234-2:2011 Cuir - Essais chimiques pour le dosage de certains colorants azoïques dans les cuirs teints - Partie 2 : dosage du 4-aminoazobenzène
  • NF A95-348*NF EN ISO 4507:2007 Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test
  • XP CEN/TS 17403:2021 Engrais - Dosage de l'azote insoluble dans l'eau froide et de l'azote insoluble dans l'eau chaude dans les engrais à libération lente urée-formaldéhyde solides etméthylène-urée, et détermination de la solubilité des polymères nutritifs da...
  • NF EN ISO 23753-1:2019 Qualité du sol - Détermination de l'activité des déshydrogénases dans les sols - Partie 1 : méthode au chlorure de triphényltétrazolium (CTT)
  • XP U42-656*XP CEN/TS 17403:2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with
  • NF X31-293-1:2011 Soil Quality - Determination of dehydrogenase activity in soils - Part 1 : method using triphenyltetrazolium chloride (TTC).
  • NF X31-293-2:2011 Soil quality - Determination of dehydrogenase activity in soils - Part 2 : method using iodotetrazolium chloride (INT).

Professional Standard - Agriculture, Nitrogen Medium Micro

  • 水产品质量安全检验手册 2.17.1.0-2005 Chapter 2 Basic Analysis Methods for Physical and Chemical Testing of Aquatic Products Section 17 Determination of Volatile Base Nitrogen in Aquatic Products (GBT 5009.44-2003) 1. Semi-trace Nitrogen Determination Method
  • 水产品质量安全检验手册 2.17.2.0-2005 Chapter 2 Basic Analysis Methods for Physical and Chemical Testing of Aquatic Products Section 17 Determination of Volatile Basic Nitrogen in Aquatic Products (GBT 5009.44-2003) 2. Trace Diffusion Method
  • GB 6324.6-1986 Photometric method for the determination of trace carbonyl compounds in organic chemical products
  • 水产品质量安全检验手册 2.11.2.0-2005 Chapter II Basic Analysis Methods for Physical and Chemical Testing of Aquatic Products Eleventh Determination of Amino Acid Nitrogen in Aquatic Products (GBT 5009.39-2003) II. Colorimetry
  • 水产品质量安全检验手册 2.11.1.0-2005 Chapter II Basic Analysis Methods for Physical and Chemical Testing of Aquatic Products Eleventh Determination of Amino Acid Nitrogen in Aquatic Products (GBT 5009.39-2003) 1. Formaldehyde value method

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, Nitrogen Medium Micro

  • GB/T 32141-2015 Determination of the total volatile basic nitrogen in feed
  • GB/T 19227-2003 Determination of nitrogen in coal and coke semi-micro gasification method
  • GB/T 14605-1993 Determination of trace argon, nitrogen and krypton inoxygen. Gas chromatographic method
  • GB/T 33392-2016 Leather and fur.Chemical tests.Determination of 4-aminoazobenzene derived from azo colorants
  • GB/T 24101-2009 Limit and determination of 4-aminoazobenzene in dye products
  • GB/T 12143.2-1989 Determination method for amino nitrogen content in fruit and vegetable juice beverages--Formol number
  • GB 12143.2-12143.3-89 Determination method for amino nitrogen content in fruit and vegetable juice beverages-Formol number Determination method for L-ascorbic acid in fruit and vegetable juice beverages-Ethyl ether extract
  • GB/T 17739.5-2006 Microfilming of technical drawings and technical documents.Part 5: Test procedures for diazo duplicating of microfilm images in aperture cards
  • GB/T 6324.6-1986 Organic chemical products for industrial use--Determination of content of carbonyl compounds present in small amounts--Photometric method

Guangdong Provincial Standard of the People's Republic of China, Nitrogen Medium Micro

  • DB44/T 317-2006 Determination of the total volatile basic nitrogen in seafood

Professional Standard - Aquaculture, Nitrogen Medium Micro

  • SC/T 3032-2007 Determination of the total volatile basic nitrogen in fishery products

Professional Standard - Chemical Industry, Nitrogen Medium Micro

  • HGB 3517-1962 Neutral red (2-methyl-3-amino-6-dimethylaminodiazaanthene hydrochloride)

Military Standard of the People's Republic of China-General Armament Department, Nitrogen Medium Micro

  • GJB 8131-2013 Specification for AlN-SiC used as microwave attenuation composites
  • GJB 950.5-1990 Analysis method of trace elements of precious metals and their alloys. Determination of trace iron in palladium alloys by sulfosalic acid photometric method.

Group Standards of the People's Republic of China, Nitrogen Medium Micro

  • 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/LTIA 13-2021 Specification for the interoperability of microbiome data in genetic testing services
  • T/ZAQ 10117-2023 Determination of Microcystis Gene in Water Real-time Quantitative PCR methods
  • T/CECS 974-2021 Technical regulations for the application of microbial anti-pantherine agents in cement-based materials
  • T/NAIA 0135-2022 Determination of carbon, hydrogen and nitrogen in coal-based Fischer-Tropsch synthetic liquid fuel oil and chemicals Elemental analyzer method
  • T/MSITISA 02-026-2023 Comprehensive Quality Services Basic Data Specification for Small, Medium and Micro-enterprises Quality Control

Inner Mongolia Provincial Standard of the People's Republic of China, Nitrogen Medium Micro

  • DB15/T 1236-2017 Determination of volatile basic nitrogen in feedstuffs of animal origin by automatic Kjeldahl method
  • DB15/T 3144-2023 Technical specifications for concentrated microbial treatment of water-based drilling cuttings in oil and gas fields
  • DB15/T 2037-2020 Determination of tryptophan in feed by microwave hydrolysis-amino acid automatic analyzer method

Jilin Provincial Standard of the People's Republic of China, Nitrogen Medium Micro

  • DB22/T 1874-2013 Determination of Volatile Basic Nitrogen in Feedstuffs of Animal Origin

Japanese Industrial Standards Committee (JISC), Nitrogen Medium Micro

  • JIS K 0227:1984 Analytical method for trace nitrogen oxides in diluent gas and zero gas
  • JIS K 0430-72-10:2000 Water quality -- Enumeration of viable micro-organisms -- Colony count by inoculation in or on a nutrient culture medium

国家市场监督管理总局、中国国家标准化管理委员会, Nitrogen Medium Micro

  • GB/T 24101-2018 Limit and determination of 4-aminoazobenzene in dye products

BE-NBN, Nitrogen Medium Micro

  • NBN-EN 10179-1992 Chemical analysis of ferrous materials. Determination of nitrogen (trace amounts) in steels. Spectrophotometric method

National Health Commission of the People's Republic of China, Nitrogen Medium Micro

  • GB 5009.235-2016 Determination of Amino Acid Nitrogen in Food Safety National Standard Food
  • GB 5009.228-2016 Determination of Volatile Base Nitrogen in Food Safety National Standards

PL-PKN, Nitrogen Medium Micro

  • PN EN 10179-1992 Chemical analysis of ferrous materials. Determination of nitrogen (trace amounts) in steels. Spectrophotometric method
  • PN T80330-1967 Microwave equipmen? Medium ?lat rec?angular waveguides Fundamental dimensions
  • PN T80331-1967 Microwave equipment Flanges for medium fiat rectangular waveguides Fundamen?al dimensions

Heilongjiang Provincial Standard of the People's Republic of China, Nitrogen Medium Micro

  • DB23/T 2963-2021 Determination of Trace Calcium Content in Natural Flake Graphite by Calcium-Arsenazo Ⅲ Spectrophotometric Method

API - American Petroleum Institute, Nitrogen Medium Micro

  • API 4217-1974 FOUNDATION FOR MODELING NOx AND SMOKE FORMATION IN DIESEL FLAMES

工业和信息化部, Nitrogen Medium Micro

  • YS/T 1539-2022 Determination of boron nitride content in aluminum-based boron nitride powder by inductively coupled plasma atomic emission spectrometry

European Committee for Standardization (CEN), Nitrogen Medium Micro

  • EN 10179:1989 Chemical Analysis of Ferrous Materials - Determination of Nitrogen (Trace Mounts) in Steel Spectrophotometric Method
  • EN ISO 4507:2007 Sintered ferrous materials, carburized or carbonitrided - Determination and verification of case-hardening depth by a micro-hardness test (ISO 4507:2000)
  • EN ISO 20130:2020 Soil quality - Measurement of enzyme activity patterns in soil samples using colorimetric substrates in micro-well plates (ISO 20130:2018)
  • PD CEN/TS 17403:2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with

Lithuanian Standards Office , Nitrogen Medium Micro

  • LST EN 10179-2000 Chemical analysis of ferrous materials - Determination of nitrogen (trace mounts) in steel - Spectrophotometric method
  • LST EN ISO 17234-2:2011 Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene (ISO 17234-2:2011)
  • LST CEN/TS 17403-2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with

AENOR, Nitrogen Medium Micro

  • UNE 36317-2:1989 Chemical analysis of ferrous materials - Determination of nitrogen (trace mounts) in steel - Spectrophotometric method
  • UNE-EN ISO 17234-2:2011 Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene (ISO 17234-2:2011)

Danish Standards Foundation, Nitrogen Medium Micro

  • DS/EN ISO 17234-2:2011 Leather - Chemical tests for the determination of certain azo colorants in dyed leathers - Part 2: Determination of 4-aminoazobenzene
  • DS/CEN/TS 17403:2021 Fertilizers – Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with

KR-KS, Nitrogen Medium Micro

  • KS M ISO 17234-2-2019 Leather — Chemical tests for the determination of certain azo colorants in dyed leathers — Part 2: Determination of 4-aminoazobenzene
  • KS I ISO 23753-1-2021 Soil quality — Determination of dehydrogenases activity in soils —Part 1: Method using triphenyltetrazolium chloride(TTC)
  • KS I ISO 6222-2019 Water quality ― Enumeration of culturable micro-organisms ― Colony count by inoculation in a nutrient agar culture medium

AT-ON, Nitrogen Medium Micro

  • ONORM DIN 10334-1994 Determination of nitrogen content of milk according to Kjeldahl and calculation of crude protein content
  • ONR CEN/TS 17403-2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with

Professional Standard - Commodity Inspection, Nitrogen Medium Micro

  • SN/T 4302-2015 Rapid detection method of tris-(aziridyl)phosphine oxide in textiles by gas chromatography-mass spectrometry

IX-EU/EC, Nitrogen Medium Micro

  • COM(1999) 93 FINAL-1999 Re-Examined Proposal for a Council Directive Relating to Limit Values for Sulphur Dioxide, Nitrogen Dioxide and Oxides of Nitrogen, Particulate Matter and Lead in Ambient Air

IT-UNI, Nitrogen Medium Micro

  • UNI CEN/TS 17403-2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution with

ES-UNE, Nitrogen Medium Micro

  • UNE-CEN/TS 17403:2021 Fertilizers - Determination of cold water insoluble nitrogen and hot water insoluble nitrogen in solid urea formaldehyde and methylene urea slow-release fertilizers and determination of the solubility of nutrient polymers in phosphate buffer solution w...

ASHRAE - American Society of Heating@ Refrigerating and Air-Conditioning Engineers@ Inc., Nitrogen Medium Micro

  • ASHRAE CH-03-3-1-2003 Demand-Based@ Real-Time Control of Microbial Growth in Air-Conditioning Cooling Water Systems

Professional Standard - Nuclear Industry, Nitrogen Medium Micro

  • EJ 267.4-1984 Determination of uranium in low-grade uranium ore Tri-n-octylphosphine oxide (or trialkylphosphine oxide) extraction 2-(5-bromo-2-pyridylazo)-5-ethylaminophenol spectrophotometric method

PT-IPQ, Nitrogen Medium Micro





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