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Database: 365,228(8 Aug 2026)

Elemental analysis and quantification

Elemental analysis and quantification, Total:188 items.

The international standard classification for "Elemental analysis and quantification" includes: Physicochemical methods of analysis , Other standards related to analytical chemistry , Coals , Non-metalliferous minerals , Magnesium and magnesium alloys , Mineral materials and products , Chemical analysis of metals , Aluminium and aluminium alloys .

The Chinese standard classification for "Elemental analysis and quantification" includes: Oxide and elementary substance , Electrochemical, thermochemistry and optical profile type analyzer , Coal analysis methods , Building material raw material ore , Light metals and their alloys analysis method , Coal for power station and industrial boiler , Precious metals and its alloy analysis method , Metallurgy material and auxiliary material in general , Material composition analysis instrument and environment detection instrument in general .


Professional Standard - Commodity Inspection

  • SN/T 3128-2012 Determination of oxygen element in organic chemicals-Elemental analyzer method
  • SN/T 3005-2011 Test Method for Instrumental Determination of Carbon

Group Standards of the People's Republic of China

  • T/CSTM 00340-2020 Determination of the carbon, hydrogen, oxygen, nitrogen, and sulfur content of graphene powder materials— Elemental analyzer method
  • T/HNNMIA 63-2023 Chemical analysis methods of amidoxime resins-Determination of nitrogen content-Elemental analysis
  • T/CNTAC 70-2020 Quantitative detection for graphene materials in fibers - Elemental analysis method
  • T/SCS 000022-2024 Molybdenum alloys – Analysis of trace elements – Glow discharge mass spectrometry method
  • T/SPSTS 013-2019 Determination of the carbon,hydrogen,oxygen,nitrogen,and sulfur content of graphene powder materials—Elemental analyzer method

Professional Standard - Aviation

  • HB 8422-2014 Quantitative detection method of EPMA for trace elements in alloys

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

  • GB/T 14506.30-2010 Methods for chemical analysis of silicate rocks—Part 30:Determination of 44 elements
  • GB/T 13748.20-2009 Chemical analysis methods of magnesium and magnesium alloys - Part 20: Determination of elements by inductively coupled plasma atomic emission spectrometry
  • GB/T 476-2001 Ultimate analysis of coal
  • GB/T 13748.20-2009(英文版) Chemical analysis methods for magnesium and magnesium alloys Part 20: Determination of element content by ICP-AES
  • GB/T 38904-2020 Methods for elemental analysis of ceramic liquid pigments
  • GB/T 31391-2015 Ultimate analysis of coal
  • GB/T 17359-2023 Microbeam analysis—Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above
  • GB/T 39527-2020 Determination of calcium,aluminium and silicon in the solid surface materials—Method of chemical analysis
  • SN/T 4764-2017 Determination of total carbon,hydrogen,nitrogen and sulfur content in coal—Elemental analyzer method

Professional Standard - Energy and Power Planning

Professional Standard - Non-ferrous Metal

  • YS/T 372.12-1994 Methods for elementary analysis of precious alloy.Determination of zinc content.EDTA complexometric titration
  • YS/T 372.9-2006 Methods for elementary analysis of precious alloy -- Determination of nickel content -- EDTA complex metric titration
  • YS/T 372.1-2006 Methods for elementary analysis of precious alloy -- Determination of silver content -- Potentiometer titration with potassium iodide
  • YS/T 897-2024 Method for chemical analysis of high purity niobium─Determination of trace impurity element content─Glow Discharge Mass Spectrometry
  • YS/T 891-2024 Method for chemical analysis of high purity titanium ─Determination of trace impurity elements content ─Glow discharge mass spectrometry
  • YS/T 372.21-2006 Methods for elementary analysis of precious alloy—Determination of zirconium content—EDTA complexometric titration
  • YS/T 372.1-1994 Methods for elementary analysis of precious alloy. Determination of silver content. Potentiometer titration with potassium iodide
  • YS/T 1467.12-2021 Methods of chemical analysis of hafnium Part 12: Determination of trace impurity elements
  • YS/T 899-2024 Method for chemical analysis of high purity tantalum—Determination of trace impurity elements content—Glow discharge mass spectrometry
  • YS/T 1033-2015 Determination of element contents in dry barrier―X-ray fluorescence spectrometric method
  • YS/T 372.4-1994 Methods for elementary analysis of precious alloy. Determination of copper content.Complexometric titration using thiourea releasing EDTA
  • YS/T 372.12-2006 Methods for elementary analysis of precious alloy - Determination of zinc content - EDTA complex metric titration
  • YS/T 1179.3-2017 Chemical analysis methods of aluminum slag-Part 3:Determination of carbon,nitrogen-Element analysis method
  • YS/T 372.20-2006 Methods for elementary analysis of precious alloy -- Determination of cadmium content -- Complex metric titration using potassium iodide releasing EDTA
  • YS/T 372.16-2006 Methods for elementary analysis of precious alloy - Determination of gallium content - EDTA complexometric titration
  • YS/T 901-2024 Method for chemical analysis of high purity tungsten-Determination of trace impurity elements content-Glow discharge mass spectrometry
  • YS/T 372.11-2006 Methods for elementary analysis of precious alloy -- Determination of magnesium content -- EDTA complex metric titration
  • YS/T 372.11-1994 Methods for elementary analysis of precious alloy.Determination of magnesium content.EDTA complexometric titration
  • YS/T 372.7-1994 Methods for elementary analysis of precious alloy. Determination of cobalt content. EDTA complexometric titration
  • YS/T 372.13-1994 Methods for elementary analysis of precious alloy. Determination of tin content. EDTA complexometric titration
  • YS/T 372.4-2006 Methods for elementary analysis of precious alloy - Determination of copper content - Complexometric titration using thiourea releasing EDTA
  • YS/T 372.7-2006 Methods for elementary analysis of precious alloy—Determination of cobalt content—EDTA complexometric titration
  • YS/T 372.3-1994 Methods for elementary analysis of precious alloy. Determination of palladoum content. Complexometric titration using butanedione dioxime releasing EDTA
  • YS/T 372.22-2006 Methods for elementary analysis of precious alloy - Determination of indium content - EDTA complex metric titration
  • YS/T 372.3-2006 Methods for elementary analysis of precious alloy - Determiantion of palladium content - Determination of palladium content - Complexometric titration using butanedione dioxime releasi
  • YS/T 372.13-2006 Methods for elementary analysis of precious alloy - Determination of tin content - EDTA complex metric titration

Professional Standard - Education

Professional Standard - Energy

  • NB/SH/T 6067-2022 Determination of carbon content in petroleum refining catalyst-Elemental analyzer method

Jiangsu Provincial Standard of the People's Republic of China

  • DB32/T 3595-2019 Elemental analyzer method for the determination of carbon, hydrogen, nitrogen, sulfur and oxygen content in graphene materials

Professional Standard - Ferrous Metallurgy

  • YB/T 6183-2024 Determination of Carbon, Hydrogen, Nitrogen, Sulfur, and Oxygen Content in Graphene Powder Elemental Analysis Method
  • YB/T 4177.1-2025 Determination of Multi-element Content in Slag by X-ray Fluorescence Spectrometry

National Metrological Technical Specifications of the People's Republic of China

  • JJF 1321-2011 Calibration Specification for Elemental Analyzers

International Organization for Standardization (ISO)

  • ISO/DIS 5533 Textiles — Quantification of carbon fibre constituent element — Elemental analyser method
  • ISO/FDIS 5533:2023 Textiles — Quantification of carbon fibre constituent element — Elemental analyser method
  • ISO 5533:2023 Textiles — Quantification of carbon fibre constituent element — Elemental analyser method
  • ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis")
  • ISO 10694 Soil quality - Determination of organic and total carbon after dry combustion (elementary analysis)
  • ISO 17247:2020 Coal and coke — Ultimate analysis
  • ISO 22309:2011 Microbeam analysis - Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above

British Standards Institution (BSI)

  • BS ISO 5533:2023 Textiles. Quantification of carbon fibre constituent element. Elemental analyser method
  • 22/30448285 DC BS ISO 5533. Textiles. Quantification of carbon fibre constituent element. Elemental analyser method
  • BS EN 15205:2006 Determination of hexavalent chromium in corrosion protection layers - Qualitative analysis
  • BS EN 17351:2020 Bio-based products. Determination of the oxygen content using an elemental analyser
  • 19/30387008 DC BS EN 17351. Bio-based products. Determination of the oxygen content using an elemental analyser
  • BS EN 13806-3:2025 Foodstuffs. Determination of trace elements - Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis)
  • BS EN 17053:2018 Animal feeding stuffs: Methods of sampling and analysis. Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method)
  • BS EN 17266:2019 Foodstuffs. Determination elements and their chemical species. Determination of organomercury in seafood by elemental mercury analysis
  • BS ISO 22309:2011 Microbeam analysis. Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above

Standard Association of Australia (SAA)

  • AS 1038.10.0:2002(R2013) Coal and Coke Analysis and Testing Determination of Trace Elements Guidelines for Determination of Trace Elements
  • AS 1038.10.1:2003(R2013) Analysis and testing of coal and coke Determination of trace elements Determination of 11 trace elements in coal, coke and fly ash Flame atomic absorption spectrometry
  • AS 1038.10.1:2003 Coal and coke - Analysis and testing - Determination of trace elements - Coal, coke and fly-ash - Dtermination of eleven trace elements - Flame atomic absorption spectrometric method

South African Bureau of Standard

  • SANS 406:2006 Coal and coke - Analysis and testing - Determination of trace elements - Guide to the determination of trace elements
  • SANS 17247:2006 Coal - Ultimate analysis

Standards Norway

  • NS-EN 12938:1999 Methods for the analysis of pewter — Determination of alloying and impurity element contents by atomic spectrometry
  • NS-EN 17351:2020 Bio-based products — Determination of the oxygen content using an elemental analyser
  • NS-EN 13346:2000 Characterization of sludges — Determination of trace elements and phosphorus — Aqua regia extraction methods
  • NS-EN 16785-1:2015 Bio-based products — Bio-based content — Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis
  • NS-EN 17053:2018 Animal feeding stuffs: Methods of sampling and analysis — Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method)

Spanish Association for Standardization (UNE)

  • UNE-EN 12938:1999 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • UNE-EN 17351:2021 Bio-based products - Determination of the oxygen content using an elemental analyser
  • UNE 77325:2003 Soil quality. Determination of total nitrogen content by dry combustion ("elemental analysis").
  • UNE 77321:2003 Soil quality. Determination of organic and total carbon after dry combustion (elementary analysis).
  • UNE-EN 17053:2018 Animal feeding stuffs: Methods of sampling and analysis - Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method)
  • UNE-EN 17266:2020 Foodstuffs - Determination elements and their chemical species - Determination of organomercury in seafood by elemental mercury analysis
  • AENOR UNE-EN 17053:2018 Animal feeding stuffs: Methods of sampling and analysis - Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method)

European Committee for Standardization (CEN)

  • EN 15205:2006 Determination of hexavalent chromium in corrosion protection layers - Qualitative analysis
  • PREN 17351-2019 Bio-based products - Determination of the oxygen content using an elemental analyser
  • PREN 16785-2014 Bio-based products - Determination of the bio-based content using the radiocarbon analysis and elemental analysis
  • EN 16785-1:2015 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis

GCC Standardization Organization

  • GSO ISO 13878:2014 Soil quality -- Determination of total nitrogen content by dry combustion ("elemental analysis")
  • GSO ISO 2355:2015 Chemical analysis of magnesium and its alloys -- Determination of rare earths -- Gravimetric method
  • GSO ISO 11938:2015 Microbeam analysis -- Electron probe microanalysis -- Methods for elemental-mapping analysis using wavelength-dispersive spectroscopy
  • GSO ISO 10694:2014 Soil quality -- Determination of organic and total carbon after dry combustion (elementary analysis)

Korean Agency for Technology and Standards (KATS)

  • KS I ISO 13878-2023 Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS I ISO 13878:2009 Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS I ISO 13878-2009(2023) Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS D ISO 2355:2002 Magnesium and its alloys-Determination of rare earths-Gravimetric method
  • KS I ISO 13878-2009(2019) Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS D ISO 3110-2002(2017) Copper alloys-Determination of aluminium as alloying element-Volumetric method
  • KS D ISO 3111-2002(2017) Copper alloys-Determination of tin as alloying element-Volumetric method
  • KS I ISO 10694:2021 Soil quality — Determination of organic and total carbon after dry combustion(elementary analysis)
  • KS I ISO 10694-2005(2015) Soil quality-Determination of organic and total carbon after dry combustion(elementary analysis)
  • KS I ISO 10694-2021 Soil quality — Determination of organic and total carbon after dry combustion(elementary analysis)
  • KS D ISO 22309:2011 Microbeam analysis-Quantitative analysis using energy-dispersive spectrometry(EDS)

Association Francaise de Normalisation

  • NF X31-418*NF ISO 13878:1998 Soil quality. Determination of total nitrogen content by dry combustion ("elemental analysis").
  • NF ISO 22309:2012 Microbeam Analysis – Quantitative elemental analysis by energy selective spectrometry (EDS) of elements having an atomic number of 11 (Na) or greater
  • NF ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis")
  • NF X85-011*NF EN 17351:2020 Bio-based products - Determination of the oxygen content using an elemental analyser
  • NF EN 17351:2020 Bio-based products - Determination of oxygen content using an elemental analyzer
  • NF V03-082-3*NF EN 13806-3:2025 Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis)
  • NF A06-902*NF EN 12938:2000 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry.
  • NF ISO 10694:1995 Soil quality - Organic carbon and total carbon determination after dry combustion (elemental analysis)
  • NF EN 15962:2011 Fertilizers - Determination of the complexed trace element content and the complexed fraction of trace elements
  • NF X21-004*NF ISO 22309:2012 Microbeam analysis - Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above.
  • XP CEN/TS 17786-2:2022 Inorganic fertilizers based on trace elements - Determination of the content of chelated trace elements and the chelated fraction of trace elements - Part 2: determination of EDTA, DTPA, HEEDTA, IDHA or the EDDS
  • NF EN 13806-3:2025 Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis)
  • NF G06-032:1978 Textiles. Quantitative analyse of binary mixtures of cellulose fibers and asbestos.
  • NF V18-247*NF EN 17053:2018 Animal feeding stuffs: Methods of sampling and analysis - Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method)
  • NF EN 16785-1:2016 Biosourced products - Biosourced content - Part 1: determination of biosourced content by radiocarbon analysis and elemental analysis
  • NF X31-409*NF ISO 10694:1995 Soil quality. Determination of organic and total carbon after dry combustion (elementary analysis).

Danish Standards Foundation

  • DS/EN 12938/AC:2001 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • DS/EN 12938:2001 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • DANSK DS/EN 17351:2020 Bio-based products – Determination of the oxygen content using an elemental analyser
  • DANSK DS/EN 13346:2001 Characterization of sludges - Determination of trace elements and phosphorus - Aqua regia extraction methods
  • DANSK DS/EN 12938:2000 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • DANSK DS/EN 16785-1:2016 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis

Lithuanian Standards Office

  • LST EN 12938-2000/AC-2003 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • LST EN 12938-2000 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry

Kingdom of Bahrain Testing and Metrology Directorate

  • BH GSO ISO 13878:2016 Soil quality -- Determination of total nitrogen content by dry combustion ("elemental analysis")
  • BH GSO ISO 2355:2016 Chemical analysis of magnesium and its alloys -- Determination of rare earths -- Gravimetric method

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

  • TCVN 6645-2000 Soil quality.Determination of total nitrogen content by dry combustion ("elemental analysis")

Swedish Institute for Standards

  • SS-ISO 13878:1999 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis")
  • SS-EN 12938:2000 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • SS-EN 17351:2020 Bio-based products - Determination of the oxygen content using an elemental analyser
  • SS-ISO 10694:1996 Soil quality - Determination of organic and totalcarbon after dry combustion (elementary analysis)
  • SS 28311:2017 Soil analysis – Determination of trace elements in soil by extraction with nitric acid
  • SS-EN 16785-1:2016 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis
  • SS-EN 15962:2011 Fertilizers - Determination of the complexed micro-nutrient content and of the complexed fraction of micro-nutrients

The Directorate General of Specifications and Metrology (DGSM)

German Institute for Standardization

  • DIN ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis") (ISO 13878:1998)
  • DIN EN 17351:2020-04 Bio-based products - Determination of the oxygen content using an elemental analyser; German version EN 17351:2020
  • DIN EN 17351:2020 Bio-based products - Determination of the oxygen content using an elemental analyser
  • DIN 10063 E:2021-03 Fertilizers – Determination of selected elements by inductively-coupled plasma mass spectrometry (ICP-MS)
  • DIN 50508:1977 Chemical analysis of copper and copper alloys; determination of tin as alloying element, volumetric method
  • DIN ISO 10694:1996 Soil quality - Determination of organic and total carbon after dry combustion (elementary analysis) (ISO 10694:1995)
  • DIN EN 12938:2000-10 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry (includes AC:2000); German version EN 12938:1999 + AC:2000
  • DIN EN 17351 E:2019 Draft Document - Bio-based products - Determination of the oxygen content using an elemental analyser; German and English version prEN 17351:2019
  • DIN EN 17351:2019-02 Draft Document - Bio-based products - Determination of the oxygen content using an elemental analyser; German and English version prEN 17351:2019
  • DIN EN 17351 E:2019-02 Bio-based products - Determination of the oxygen content using an elemental analyser
  • DIN EN 16785 E:2014-10 Determination of biobased content of biobased products using radiocarbon analysis and elemental analysis
  • DIN ISO 13878:1998-11 Soil quality - Determination of total nitrogen content by dry combustion ('elemental analysis') (ISO 13878:1998)
  • DIN EN 16785 E:2014 Draft Document - Bio-based products - Determination of the bio-based content using the radiocarbon analysis and elemental analysis; German version prEN 16785:2014
  • DIN EN 13806-3:2023 Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis); German and English version prEN 13806-3:2023
  • DIN 50508:1977-06 Chemical analysis of copper and copper alloys; determination of tin as alloying element, volumetric method
  • DIN EN 13806-3:2023-07 Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis); German and English version prEN 13806-3:2023 / Note: Date of issue 2023...
  • DIN EN 17266:2020-03 Foodstuffs - Determination elements and their chemical species - Determination of organomercury in seafood by elemental mercury analysis; German version EN 17266:2019
  • DIN EN 13806-3 E:2023-07 Draft Document - Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis); German and English version prEN 13806-3:2023
  • DIN EN 17053:2018-03 Animal feeding stuffs - Methods of sampling and analysis - Determination of trace elements, heavy metals and other elements in feed by ICP-MS (multi-method); German version EN 17053:2018
  • DIN EN 16785-1:2016 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis
  • DIN ISO 22309 E:2015-05 Microbeam analysis - Quantitative analysis using energy-dispersive spectrometry (EDS) for elements with an atomic number of 11 (Na) or above
  • DIN EN 13806-3 E:2023 Draft Document - Foodstuffs - Determination of trace elements - Part 3: Determination of total mercury in foodstuffs with atomic absorption directly from the foodstuff (elemental mercury analysis); German and English version prEN 13806-3:2023
  • DIN EN 16785-1:2016-03 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis; German version EN 16785-1:2015

Ente Nazionale Italiano di Unificazione

  • UNI EN 17351:2020 Bio-based products - Determination of the oxygen content using an elemental analyser
  • UNI 6970:1971 Methods of chemical analysis of nonferrous metals. Chemical analysis of magnesium alloys. Gravimetric determination of rare earths.
  • UNI EN 15962:2011 Fertilizers - Determination of the complexed micro-nutrient content and of the complexed fraction of micro- nutrients
  • UNI EN 16785-1:2016 Bio-based products - Bio-based content - Part 1: Determination of the bio-based content using the radiocarbon analysis and elemental analysis

National Standardisation Body (ASRO)

  • STAS 10274/2-1983 Solid fuck ASH ANALYSIS Quantitative spectral analysis of minor, rare and dispersed elements

Magyar Szabványügyi Testület

Gosstandart of Russia

  • GOST ISO 17247-2016 Coal. Elemental analysis
  • GOST ISO 10694-2024 Soil quality. Determination of organic and total carbon after dry combustion (elemental analysis)
  • GOST 31870-2012 Drinking water. Determination of elements content by atomic spectrometry methods
  • GOST 19877-1982 Dissolving pulp. Spectral method for determining of elements in pulp

Polski Komitet Normalizacyjny (PKN)

  • PN H04208-03-1989 Chemical Analysis of Ferroalloys. Ferromolybdenum. Silicon Content Determination.

Clinical and Laboratory Standards Institute

  • CLSI C38-A-1997 Guidance for the Approval of Pre-Analytical Variants for Controlled Trace Element Assays

American Society for Testing and Materials (ASTM)

Finnish Standards Institute

  • SFS 3003-1974 The total amount of calcium and magnesium in the water is determined. Titration measurement method

Yugoslav Association for Standardization

  • JUS C.A1.616-1980 Methods for chemical analvsis ofcopper and copper alloys. Votumetric determination ofcontent ofiron as alloving element