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Database: 365,228(8 Aug 2026)

Alloy element content analysis

Alloy element content analysis, Total:181 items.

The international standard classification for "Alloy element content analysis" includes: Magnesium and magnesium alloys , Powder metallurgy , Chemical analysis of metals , Nickel, chromium and their alloys .

The Chinese standard classification for "Alloy element content analysis" includes: Light metals and their alloys analysis method , Powder metallurgy analysis method , Precious metals and its alloy analysis method , Metal chemical property test method .


Taiwan Provincial Standard of the People's Republic of China

  • CNS 12996-1992 Method of Determination for Contents of Metallic Elements of Hardmetals by X-Ray Fluorescence (Fusion Method)

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

  • GB/T 16477.1-2024 Chemical analysis methods of silicon-based rare earth ferroalloy and RE-Mg ferro-silicon alloy—Part 1: Determination of total rare earth and fifteen rare earth elements contents
  • GB/T 26050-2010 Hardmetals—Determination of contents of metallic elements by X-ray fluorescence—Fusion method
  • 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 13748.21-2009 Chemical analysis methods of magnesium and magnesium alloys - Part 21 : Determination of elements by photoelectric direct reading atomic emission spectrometry
  • GB/T 13748.21-2009(英文版) Chemical analysis methods for magnesium and magnesium alloys Part 21: Determination of element content by photoelectric direct reading atomic emission spectrometry
  • 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

Professional Standard - Aviation

  • HB 5218.16-1995 Aluminum Alloy Chemical Analysis Method Quercetin Spectrophotometric Determination of Dissolved Zirconium Content
  • HB 5219.15-1998 Methods for Chemical Analysis of Magnesium Alloy- Determination of Dissolved Zirconium Content with Quercetin Spectrophotometric Method
  • HB 8422-2014 Quantitative detection method of EPMA for trace elements in alloys
  • HB 5218.16-1982 Aluminum Alloy Chemical Analysis Method Quercetin Spectrophotometric Determination of Dissolved Zirconium Content

Professional Standard - Commodity Inspection

  • SN/T 3128-2012 Determination of oxygen element in organic chemicals-Elemental analyzer method

Professional Standard - Chemical Industry

Professional Standard - Non-ferrous Metal

  • YS/T 372.10-1994 Methods for elementary analysis of precious alloy. Determination of nickel content in AuNi and PdNi alloy. EDTA complexometric titration
  • YS/T 372.12-1994 Methods for elementary analysis of precious alloy.Determination of zinc content.EDTA complexometric titration
  • YS/T 372.14-1994 Methods for elementary analysis of precious alloy. Determination of manganese content. Potentiometer titration using potassium permanganate
  • YS/T 372.14-2006 Methods for elementary analysis of precious alloy -- Determination of magnesium content -- Potentiometer titration using potassium permanganate
  • YS/T 372.16-2006 Methods for elementary analysis of precious alloy - Determination of gallium content - EDTA complexometric titration
  • YS/T 372.22-2006 Methods for elementary analysis of precious alloy - Determination of indium content - EDTA complex metric titration
  • YS/T 372.8-2006 Methods for elementary analysis of precious alloy - Determination of cobalt content in PtCo alloy - EDTA complex metric titration
  • YS/T 372.5-2006 Methods for elementary analysis of precious alloy - Determination of copper content in PtCu alloy - EDTA complex metric titration
  • YS/T 372.13-2006 Methods for elementary analysis of precious alloy - Determination of tin 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 372.19-2006 Method for elementary analysis of precious alloy—Determination of yttrium content—Chlorophosphonazo Ⅲ spectrophotometry
  • 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 372.11-1994 Methods for elementary analysis of precious alloy.Determination of magnesium content.EDTA complexometric titration
  • YS/T 372.12-2006 Methods for elementary analysis of precious alloy - Determination of zinc content - EDTA complex metric titration
  • YS/T 372.2-2006 Methods for elementary analysis of precious alloy—Determiatnion of platinum content—Electricity titration using potassium permanganate
  • YS/T 372.2-1994 Methods for elementary analysis of precious alloy. Determination of platinum content. Electricity titration using potassium permanganate
  • YS/T 372.1-1994 Methods for elementary analysis of precious alloy. Determination of silver content. Potentiometer titration with potassium iodide
  • 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 372.11-2006 Methods for elementary analysis of precious alloy -- Determination of magnesium content -- EDTA complex metric titration
  • YS/T 372.10-2006 Methods for elementary analysis of precious alloy - Determination of nickel content in AuNi and PdNi alloy - EDTA complex metric 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 372.4-1994 Methods for elementary analysis of precious alloy. Determination of copper content.Complexometric titration using thiourea releasing EDTA
  • 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 372.5-1994 Methods for elementary analysis of precious alloy. Determination of copper content in PtCu alloy. EDTA complexometric titration
  • YS/T 372.15-2006 Methods for elementary analysis of precious alloy - Determination of antimony content - The flame atomic absorption spectrometric method
  • YS/T 372.13-1994 Methods for elementary analysis of precious alloy. Determination of tin content. EDTA complexometric titration
  • YS/T 372.7-2006 Methods for elementary analysis of precious alloy—Determination of cobalt 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 372.18-2006 Method for elementary analysis of precious alloy - Determination of gadolinium content - Chlorophosphonazo Ⅲ spectrophotometry
  • YS/T 372.9-2006 Methods for elementary analysis of precious alloy -- Determination of nickel content -- EDTA complex metric titration
  • YS/T 372.21-2006 Methods for elementary analysis of precious alloy—Determination of zirconium content—EDTA complexometric titration

Military Standard of the People's Republic of China-General Armament Department

  • GJB 8781.9-2015 Methods for trace element analysis of high-temperature alloys Part 9: Determination of antimony content by hydride generation-atomic fluorescence spectrometry
  • GJB 8781.8-2015 Methods for trace element analysis of high temperature alloys Part 8: Determination of magnesium content by flame atomic absorption spectrometry
  • GJB 8781.3-2015 Methods for trace element analysis of superalloys Part 3: Determination of calcium content by flame atomic absorption spectrometry
  • GJB 770.201-1989 Test methods for gunpowder analysis Determination of metal element content Atomic absorption spectrometry
  • GJB 8781.6-2015 Methods for trace element analysis of high temperature alloys Part 6: Determination of gallium content by graphite furnace atomic absorption spectrometry
  • GJB 950.2-1990 Analysis method of trace elements of precious metals and their alloys ICP-AES method Determination of trace amounts of iron, lead, antimony and bismuth in silver and silver alloys
  • GJB 950.1-1990 Analysis method of trace elements of precious metals and their alloys ICP-AES method Determination of trace amounts of lead, antimony, bismuth and iron in gold and gold alloys
  • GJB 8781.2-2015 Methods for trace element analysis of high-temperature alloys Part 2: Determination of bismuth content by hydride generation-atomic fluorescence spectrometry
  • GJB 8781.1-2015 Methods for trace element analysis of high-temperature alloys Part 1: Dithizone carbon tetrachloride extraction-spectrophotometric determination of silver content
  • GJB 950.8-1990 Trace element analysis method of precious metals and their alloys ICP-AES method for determination of trace amounts of palladium and rhodium in platinum alloys
  • 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.
  • GJB 8781.12-2015 Methods for trace element analysis of high-temperature alloys Part 12: Determination of tellurium content by hydride generation-atomic fluorescence spectrometry
  • GJB 8781.5-2015 Methods for trace element analysis of high temperature alloys Part 5: Determination of copper content by flame atomic absorption spectrometry
  • GJB 8781.10-2015 Methods for trace element analysis of high temperature alloys Part 10: Determination of selenium content by graphite furnace atomic absorption spectrometry

工业和信息化部

  • YS/T 1179.3-2017 Chemical analysis methods of aluminum slag-Part 3:Determination of carbon,nitrogen-Element analysis method
  • YS/T 806-2020 Method for chemical analysis of aluminium and aluminium alloys-Determination of element contents-X-ray fluorescence spectrometry
  • XB/T 628-2020 Methods for chemical analysis of high purity rare earth metals-Determination of trace element contents-Glow discharge mass spectrometry
  • YS/T 1494-2021 Chemical analysis method for high purity gold Determination of impurity element content Glow discharge mass spectrometry

Military Standard of the People's Republic of China-Commission of Science,Technology and Industry for National Defence

  • GJB 5404.3-2005 Analysis methods for trace elements in super alloys Part 3: Determination of calcium conten by flame atomic absorption spectrometric method
  • GJB 5404.9-2005 Analysis methods for trace elements in super alloys Part 9: Determination of antimony content by hydride generation atomic fluorescence spectrometric method
  • GJB 5404.1-2005 Analysis methods for trace elements in super alloys Part 1: Determination of silver content by dithizone tetrachloromethane extraction-spectrophotometric method
  • GJB 5404.5-2005 Analysis methods for trace elements in super alloys Part 5: Determination of copper content by flame atomic absorption spectrometric method
  • GJB 5404.10-2005 Analysis methods for trace elements in super alloys Part 10: Determination of selenium content by graphite furnace atomic absorption spectrometric method
  • GJB 5404.2-2005 Analysis methods for trace elements in super alloys. Part 2: Determination of bismuth content by hydride generation-atomic fluorescence spectrometric method
  • GJB 5404.8-2005 Analysis methods for trace elements in super alloys Part 8: Determination of magnesium content by flame atomic absorption spectrometric method
  • GJB 5404.12-2005 Analysis methods for trace elements in super alloys Part 12: Determination of tellurium content by hydride generation atomic fluorescence spectrometric method
  • GJB 5404.6-2005 Analysis methods for trace elements in super alloys Part 6: Determination of gallium content by graphite furnace atomic absorption spectrometric method

国家市场监督管理总局、中国国家标准化管理委员会

  • GB/T 38904-2020 Methods for elemental analysis of ceramic liquid pigments
  • GB/T 38939-2020 Nickel-based alloy—Determination of multi-element contents—Spark discharge atomic emission spectrometric method(routine method)

国家质量监督检验检疫总局

  • SN/T 4764-2017 Determination of total carbon,hydrogen,nitrogen and sulfur content in coal—Elemental analyzer method

Group Standards of the People's Republic of China

  • T/HNNMIA 63-2023 Chemical analysis methods of amidoxime resins-Determination of nitrogen content-Elemental analysis
  • T/SDAS 4-2016 Methods for chemical analysis of high purity gold—Determination of impurity elements contents—Glow discharge mass spectrometry

未注明发布机构

  • AS 3515.1:2005(R2016) Gold and gold bearing alloys - Determination of gold content (less than 30%) - Gravimetric (fire assay) method
  • DIN EN 17351 E:2019-02 Bio-based products - Determination of the oxygen content using an elemental analyser

ES-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-EN 24503:1993 HARDMETALS. DETERMINATION OF CONTENT OF METALLOC ELEMENTS BY X-RAY FLUORENSCENCE. FUSION METHOD (Endorsed by AENOR in May of 1993.)

SCC

  • NS-EN 12938:1999 Methods for the analysis of pewter — Determination of alloying and impurity element contents by atomic spectrometry
  • DANSK DS/EN 12938:2000 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
  • DANSK DS/EN 17351:2020 Bio-based products – Determination of the oxygen content using an elemental analyser
  • DANSK DS/ISO 4883:1993 Hardmetals - Determination of contents of metallic elements by x-ray fluorescence - Solution method
  • DANSK DS/EN 24503:1993 Hardmetals - Determination of contents of metallic elements by X-ray fluorescence - Fusion method
  • DANSK DS/EN 24883:1993 Hardmetals - Determination of contents of metallic elements by x-ray fluorescence - Solution method
  • DANSK DS/ISO 4503:1993 Hardmetals - Determination of contents of metallic elements by X-ray fluorescence - Fusion method
  • 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

German Institute for Standardization

  • 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 50508:1977 Chemical analysis of copper and copper alloys; determination of tin as alloying element, volumetric method
  • DIN 50508:1977-06 Chemical analysis of copper and copper alloys; determination of tin as alloying element, volumetric method
  • DIN ISO 4503:1991 Hardmetals; determination of contents of metallic elements by x-ray fluorescence; fusion method; identical with ISO 4503:1978
  • 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 ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis") (ISO 13878:1998)
  • DIN ISO 10694:1996 Soil quality - Determination of organic and total carbon after dry combustion (elementary analysis) (ISO 10694:1995)
  • DIN ISO 4883:1991 Hardmetals; determination of contents of metallic elements by X-ray fluorescence; solution method; identical with ISO 4883:1978

Lithuanian Standards Office

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

Association Francaise de Normalisation

  • NF A06-902*NF EN 12938:2000 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry.
  • NF EN 15962:2011 Fertilizers - Determination of the complexed trace element content and the complexed fraction of trace elements
  • NF X31-418*NF ISO 13878:1998 Soil quality. Determination of total nitrogen content by dry combustion ("elemental analysis").
  • NF EN 17351:2020 Bio-based products - Determination of oxygen content using an elemental analyzer
  • 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 A08-651:1993 Chemical analysis of titanium and aluminium alloys. Determination of elements contents in low content in the TA6V alloy. Method by flame atomic absorption spectrometry or by plasma emission spectrometry.
  • 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
  • XP CEN/TS 17786-1:2022 Inorganic fertilizers based on trace elements - Determination of the content of chelated trace elements and the chelated fraction of trace elements - Part 1: treatment with a cation exchange resin
  • NF A95-490*NF EN 24883:1993 Hardmetals. Determination of contents of metallic elements by X-ray fluorescence. Solution method.

Danish Standards Foundation

  • DS/EN 12938:2001 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • DS/EN 12938/AC:2001 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • DS/EN 24883:1993 Hardmetals. Determination of contents of metallic elements by X-ray fluorescence. Solution method
  • DS/EN 24503:1993 Hardmetals. Determination of contents of metallic elements by X-ray fluorescence. Fusion method
  • DS/EN 24503:1994 Hardmetals - Determination of contents of metallic elements by X-ray fluorescence - Fusion method

PL-PKN

  • PN H04208-03-1989 Analiza chemiczna ?elazostopów ?elazomolibden Oznaczanie zawarto?ci krzemu

Korean Agency for Technology and Standards (KATS)

  • KS D ISO 2355:2002 Magnesium and its alloys-Determination of rare earths-Gravimetric method
  • 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 D ISO 3111:2002 Copper alloys-Determination of tin as alloying element-Volumetric method
  • KS D ISO 3110:2002 Copper alloys-Determination of aluminium as alloying element-Volumetric method
  • KS D 2042-1997(2003) METHODS FOR DETERMINATION OF RARE EARTHS IN MAGNESIUM ALLOYS
  • KS D 1938-2003(2013) Determination of element content in zinc and zinc alloy
  • KS I ISO 13878-2023 Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS D ISO 4503-2003(2018) Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Fusion method
  • KS I ISO 13878:2009 Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS I ISO 13878-2009(2019) Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS D ISO 4883-2003(2018) Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Solution method
  • KS D 1674-2019 Methods for inductively coupled plasma spectrometric analysis of trace elements in gold
  • KS D ISO 4883-2023 Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Solution method
  • KS D ISO 4883:2003 Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Solution method
  • KS D ISO 4503:2003 Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Fusion method
  • KS D ISO 4503-2023 Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Fusion method
  • KS D ISO 3110-2022 Copper alloys-Determination of aluminium as alloying element-Volumetric method
  • KS D ISO 3111-2022 Copper alloys-Determination of tin as alloying element-Volumetric method
  • KS D 1702-2020 Platium-Determination of trace-element content by inductively coupled plasma spectrometric analysis-Matrix matching method

YU-JUS

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

British Standards Institution (BSI)

  • BS EN 12938:2000(2001) Methods for the analysis of pewter. Determination of alloying and impurity element contents by atomic spectrometry
  • BS EN 12938:2000 Methods for the analysis of pewter. Determination of alloying and impurity element contents by atomic spectrometry
  • BS 3907-8:1970 Methods for the analysis of magnesium and magnesium alloys - Determination of total rare earths in magnesium alloys (gravimetric method)
  • BS 3907-10:1969 Methods for the analysis of magnesium and magnesium alloys - Determination of manganese in magnesium alloys containing zirconium, rare earths, thorium and/or silver (photometric method)
  • BS EN 17351:2020 Bio-based products. Determination of the oxygen content using an elemental analyser
  • BS EN 24503:1993 Hardmetals. Determination of contents of metallic elements by X-ray fluorescence. Fusion method

International Organization for Standardization (ISO)

  • ISO 3110:1975 Copper alloys; Determination of aluminium as alloying element; Volumetric method
  • ISO 3111:1975 Copper alloys; Determination of tin as alloying element; Volumetric method
  • ISO 13878:1998 Soil quality - Determination of total nitrogen content by dry combustion ("elemental analysis")
  • ISO/DIS 5533 Textiles — Quantification of carbon fibre constituent element — Elemental analyser method
  • ISO 4503:1978 Hardmetals; Determination of contents of metallic elements by X-ray fluorescense; Fusion method

HU-MSZT

IT-UNI

  • UNI 7850-1978 Chemical analysis of ferrous metal materials. Determination of aluminum, the constituent element of the copper alloy

GSO

  • OS GSO ISO 2355:2015 Chemical analysis of magnesium and its alloys -- Determination of rare earths -- Gravimetric method
  • GSO ISO 2355:2015 Chemical analysis of magnesium and its alloys -- Determination of rare earths -- Gravimetric method
  • GSO ISO 13878:2014 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
  • BH GSO ISO 13878:2016 Soil quality -- Determination of total nitrogen content by dry combustion ("elemental analysis")
  • OS GSO ISO 4503:2016 Hardmetals -- Determination of contents of metallic elements by X-ray fluorescence -- Fusion method
  • BH GSO ISO 4503:2017 Hardmetals -- Determination of contents of metallic elements by X-ray fluorescence -- Fusion method
  • GSO ISO 4883:2015 Hardmetals -- Determination of contents of metallic elements by X-ray fluorescence -- Solution method
  • GSO ISO 4503:2016 Hardmetals -- Determination of contents of metallic elements by X-ray fluorescence -- Fusion method
  • OS GSO ISO 4883:2015 Hardmetals -- Determination of contents of metallic elements by X-ray fluorescence -- Solution method
  • GSO ISO 11437-2:2015 Nickel alloys -- Determination of trace-element content by electrothermal atomic absorption spectrometric method -- Part 2: Determination of lead content
  • BH GSO ISO 11437-2:2017 Nickel alloys -- Determination of trace-element content by electrothermal atomic absorption spectrometric method -- Part 2: Determination of lead content
  • GSO ISO 3111:2013 Copper alloys -- Determination of tin as alloying element -- Volumetric method
  • OS GSO ISO 3110:2013 Copper alloys -- Determination of aluminium as alloying element -- Volumetric method
  • OS GSO ISO 3111:2013 Copper alloys -- Determination of tin as alloying element -- Volumetric method

VN-TCVN

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

KR-KS

  • KS I ISO 13878-2009(2023) Soil quality-Determination of total nitrogen content by dry combustion(“elemental analysis”)
  • KS D ISO 4503-2003(2023) Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Fusion method
  • KS D ISO 4883-2003(2023) Hardmetals-Determination of contents of metallic elements by X-ray fluorescence-Solution method

European Committee for Standardization (CEN)

  • EN 12938:1999 Methods for the analysis of pewter - Determination of alloying and impurity element contents by atomic spectrometry
  • 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

CEN - European Committee for Standardization

  • PREN 17351-2019 Bio-based products - Determination of the oxygen content using an elemental analyser

AENOR

  • UNE 77325:2003 Soil quality. Determination of total nitrogen content by dry combustion ("elemental analysis").

CZ-CSN

  • CSN ISO 4742:1992 Copper alloys - Determination of nickel content - Gravimetric method

Standard Association of Australia (SAA)

  • AS 3515.1:2005 Gold and gold bearing alloys - Determination of gold content (less than 30%) - Gravimetric (fire assay) method