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atomic metal catalyst
atomic metal catalyst, Total:156 items.
In the international standard classification, atomic metal catalyst involves: Products of the chemical industry, Analytical chemistry, Internal combustion engines, Non-ferrous metals, Inorganic chemicals, Powder metallurgy, Products of non-ferrous metals, Photography, Plastics, Testing of metals, Environmental protection, Sugar. Sugar products. Starch, Raw materials for rubber and plastics, Metalliferous minerals, Ferrous metals, Leather technology, Fuels.
工业和信息化部, atomic metal catalyst
- HG/T 5765-2020 Determination of metal elements in catalytic cracking catalysts
- HG/T 5763-2020 Determination of metal elements in metallocene polyolefin catalysts by inductively coupled plasma optical emission spectrometry
- HG/T 5910-2021 Analysis method of chemical components of bimetal-supported polyether polyol synthesis catalyst
- YS/T 832-2020 Chemical analysis method for butyl-octyl alcohol spent catalyst Determination of rhodium content by inductively coupled plasma atomic emission spectrometry
American Society for Testing and Materials (ASTM), atomic metal catalyst
- ASTM UOP879-87 Aluminum in Catalysts by Atomic Absorption
- ASTM UOP878-87 Potassium in Catalysts by Atomic Absorption
- ASTM D5153-91(1997) Standard Test Method for Palladium in Molecular Sieve Catalyst by Atomic Absorption
- ASTM D7206/D7206M-06(2012)e1 Standard Guide for Cyclic Deactivation of Fluid Catalytic Cracking (FCC) Catalysts with Metals
- ASTM D7206/D7206M-06(2013)e1 Standard Guide for Cyclic Deactivation of Fluid Catalytic Cracking (FCC) Catalysts with Metals
- ASTM D7206/D7206M-19 Standard Guide for Cyclic Deactivation of Fluid Catalytic Cracking (FCC) Catalysts with Metals
- ASTM UOP873-86 Noble Metals and Modifiers in Catalysts by ICP-AES
- ASTM D5153-04 Standard Test Method for Palladium in Molecular Sieve Catalyst by Atomic Absorption
- ASTM D7206-06 Standard Guide for Cyclic Deactivation of Fluid Catalytic Cracking (FCC) Catalysts with Metals
- ASTM D4463/D4463M-19 Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM UOP927-92 Trace Metallic Impurities in Fresh Catalysts by ICP-AES
- ASTM D5153-10 Standard Test Method for Palladium in Molecular Sieve Catalyst by Atomic Absorption
- ASTM D5153-10(2016) Standard Test Method for Palladium in Molecular Sieve Catalyst by Atomic Absorption
- ASTM D4463-96 Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM D4463-96(2001) Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM D4463-96(2006) Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM UOP410-85 Sodium in Catalysts by Flame Emission or Atomic Absorption Spectrophotometry
- ASTM UOP833-82 Molybdenum in Platforming Catalysts and Fines by Atomic Absorption Spectrophotometry
- ASTM D5153-22 Standard Test Method for Palladium in Molecular Sieve Catalyst by Atomic Absorption Spectrophotometry
- ASTM D4463/D4463M-96(2012)e1 Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM D4463/D4463M-96(2013)e1 Standard Guide for Metals Free Steam Deactivation of Fresh Fluid Cracking Catalysts
- ASTM D7442-08a Standard Practice for Sample Preparation of Fluid Catalytic Cracking Catalysts and Zeolites for Elemental Analysis by Inductively Coupled Plasma Atomic Emission Spectroscopy
- ASTM D7442-08 Standard Practice for Sample Preparation of Fluid Catalytic Cracking Catalysts and Zeolites for Elemental Analysis by Inductively Coupled Plasma Atomic Emission Spectroscopy
- ASTM D1977-98 Standard Test Method for Nickel and Vanadium in FCC Equilibrium Catalysts by Hydrofluoric/Sulfuric Acid Decomposition and Atomic Spectroscopic Analysis
- ASTM D1977-22 Standard Test Method for Nickel and Vanadium in FCC Equilibrium Catalysts by Hydrofluoric/Sulfuric Acid Decomposition and Atomic Spectroscopic Analysis
- ASTM D7740-20 Standard Practice for Optimization, Calibration, and Validation of Atomic Absorption Spectrometry for Metal Analysis of Petroleum Products and Lubricants
- ASTM E1024-97 Standard Guide for Chemical Analysis of Metals and Metal Bearing Ores by Flame Atomic Absorption Spectrophotometry
- ASTM D1977-03 Standard Test Method for Nickel and Vanadium in FCC Equilibrium Catalysts by Hydrofluoric/Sulfuric Acid Decomposition and Atomic Spectroscopic Analysis
- ASTM D1977-03(2008) Standard Test Method for Nickel and Vanadium in FCC Equilibrium Catalysts by Hydrofluoric/Sulfuric Acid Decomposition and Atomic Spectroscopic Analysis
- ASTM D7740-11 Standard Practice for Optimization, Calibration, and Validation of Atomic Absorption Spectrometry for Metal Analysis of Petroleum Products and Lubricants
- ASTM D1977-16 Standard Test Method for Nickel and Vanadium in FCC Equilibrium Catalysts by Hydrofluoric/Sulfuric Acid Decomposition and Atomic Spectroscopic Analysis
- ASTM E1024-97(2004) Standard Guide for Chemical Analysis of Metals and Metal Bearing Ores by Flame Atomic Absorption Spectrophotometry (Withdrawn 2004)
Group Standards of the People's Republic of China, atomic metal catalyst
- T/CICEIA /CAMS26-2021 Diesel engine — Cu-zeolite SCR catalyst for NOx emission control
- T/CPCIF 0192-2022 Ru-Zn bimetallic catalyst for benzene to cyclohexene
- T/CASME 99-2022 Noble metal catalyst support High purity pseudoboehmite
- T/CNIA 0097-2021 Green Design Product Evaluation Technical Specifications Noble Metal Carbon-Supported Catalysts
- T/CNIA 0099-2021 Green Design Product Evaluation Technical Specifications Alumina Supported Precious Metal Catalysts
- T/CNIA 0020-2019 Determination of Impurity Content in Resin Catalysts for the Disproportionation of Chlorosilanes by Inductively Coupled Plasma-Atomic Emission Spectrometry
- T/CSTM 00761-2021 Nickel—Determination of selenium and tellurium contents —Hydride generation- atomic fluorescence spectrometric method
- T/CSTM 00760-2021 Nickel—Determination of arsenic, antimony and bismuth contents —Hydride generation- atomic fluorescence spectrometric method
- T/QAS 081.4-2023 Chemical analysis of polymetallic minerals - Part 4: Determination of tin by hydride generation - atomic fluorescence spectrometry
- T/QAS 081.5-2023 Chemical analysis of polymetallic minerals - Part 5: Determination of gold by foam adsorption - atomic absorption spectrometry
Professional Standard - Non-ferrous Metal, atomic metal catalyst
- YS/T 835-2012 Determination of platinum,palladium and rhodium in exhaust purfication metallic substrate auto-catalysts .Flame atomic absorption spectrometry
- YS/T 832-2012 Determination of rhodium in spent oxo.Alcohols catalyst.Inductively coupled plasma atomic emission spectrometry
Professional Standard - Chemical Industry, atomic metal catalyst
- HG/T 5764～5767-2020 Determination of pore structure of petroleum refining catalysts, determination of metal elements in catalytic cracking catalysts, test methods for catalyst activity of supported rosin disproportionation and catalysts for cobalt and molybdenum sulfide (202
- HG/T 5909～5910-2021 Analytical methods for the chemical composition of meropenem synthesis catalysts and bimetallic supported polyether polyol synthesis catalysts (2021)
- HG/T 2415-2007 Photographic chemicals.Measurement methods of the trace-metals in the color couples.Flame photometry of the atomic absorbs
- HG/T 2415-1993 Photographic Chemicals - Determination of Trace Metals in Couplers - Flame Atomic Absorption Spectrometry
国家市场监督管理总局、中国国家标准化管理委员会, atomic metal catalyst
- GB/T 38596-2020 Determination method of heavy metal contents in the wastewater during catalyst production
- GB/T 23524-2019 Method for chemical analysis of petrochemical spent platinum catalyst—Determination of platinum—Inductively coupled plasma atomic emission spectrometry
- GB/T 36764-2018 Rubber compounding ingredients—Silica, precipitated, hydrated—Determination of heavy metal content by inductively coupled plasma atomic emission spectrometric method
Professional Standard - Petrochemical Industry, atomic metal catalyst
- SH/T 0651-1997 Standard test method for tin in reforming catalysts by atomic absorption spectrometry
- SH/T 0684-1999 Standard test method for palladium in molecular sieve catalysts and in aluminium oxide base catalysts by atomic absorption spectrometry
- SH/T 0696-2000 Standard test method for nickel and vanadium in FCC equilibrium catalysts by hydrofluoric/sulfuric acid decomposition and atomic spectroscopic analysis
General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, atomic metal catalyst
- GB/T 23277-2009 Chemical analysis methods of catalysts containing precious metals. Determination of platinum，palladium and rhodium in automobile exhaust-purifying catalysts.Spectrophotometry
- GB/T 10726-1989 Chemical reagent--General method for the determination of metals by solvent extraction followed by AAS
- GB/T 10726-2007 Chemical reagent.General method for the determination of metals by solvent extraction followed by AAS
- GB/T 23524-2009 Test method of spent petrochemical catalyst.Determination of platinum.Inductively coupled plasma atomic emission spectrometry
- GB/T 30014-2013 Methods for chemical analysis of spent palladium-carbon.Determination of palladium.Inductively coupled plasma atomic emission spectrometry
- GB/T 4702.5-1984 Methods for chemical analysis of chromium metal--The atomic absorption spectrophotometric method for the determination of aluminum content
- GB/T 4702.7-1984 Methods for chemical analysis of chromium metal--The atomic absorption spectrophotometric method for the determination of iron content
- GB/T 15072.11-2008 Test method of precious metal alloys.Determination of gadolinium and beryllium contents for gold alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.16-2008 Test method of precious metal alloys.Determination of copper and manganese contents for gold alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.18-2008 Test method of precious metal alloys.Determination of zirconium and gadolinium contents for gold alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.7-2008 Test methods of precious metal alloys.Determination of chromium and iron contents for gold alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 12690.16-1990 Rare-earth metals and their oxides--Determination of calcium content--Flame atomic absorption spectrometric method
- GB/T 32433-2015 Footwear.Chemical test method.Heavy metal content.Microwave plasma atomic emission spectroscopy
- GB/T 15072.14-2008 Test method of precious metal alloys.Determination of aluminium and nickel contents for silver alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.19-2008 Test method of precious metal alloys.Determination of vanadium and magnesium contents for silver alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.15-2008 Test method of precious metal alloys.Determination of nickel,zinc and manganese contents for gold,silver and palladium alloys.Inductively coupled plasma atomic emission spectrometry
- GB/T 15072.13-2008 Test method of precious metal alloys.Determination of tin,cerium and lanthanium contents for silver alloys.Inductively coupled clasma atomic emission spectrometry
- GB/T 12690.17-1990 Rare-earth metals and their oxides--Determination of calcium content--Nitrous oxide-acetylene flame atomic absorption spectrometric method
RU-GOST R, atomic metal catalyst
- GOST 23401-1990 Metal powders. Catalysts and carriers. Determination of specific area
- GOST R 50233.5-1992 Niobium pentoxide. Chemical-atomic-emission method for determination of impurity metals
工业和信息化部/国家能源局, atomic metal catalyst
Universal Oil Products Company (UOP), atomic metal catalyst
- UOP 927-1992 TRACE METALLIC IMPURITIES IN FRESH CATALYSTS BY ICP-AES
Professional Standard - Agriculture, atomic metal catalyst
- GB 10726-1989 General method for the determination of metal impurities by chemical reagent solvent extraction-atomic absorption spectrometry
FI-SFS, atomic metal catalyst
Taiwan Provincial Standard of the People's Republic of China, atomic metal catalyst
- CNS 9499-1982 Method of Chemical Analysis for Aluminium in Metallic Silicon (Atomic Absorptimetric Method)
- CNS 9502-1982 Method of Chemical Analysis for Calcium in Metallic Silicon (Atomic Absorptimetric Method)
- CNS 9496-1982 Method of Chemical Analysis for Ferrite in Metallic Silicon (Atomic Absorptimetric Method)
Yunnan Provincial Standard of the People's Republic of China, atomic metal catalyst
- DB53/T 936-2019 Technical specifications for exhaust gas treatment engineering of exhausted precious metal catalyst wet enrichment process in petrochemical industry
- DB53/T 816-2017 Determination of Platinum, Palladium and Rhodium Contents in Plasma Smelted Ferroalloys of Failed Automobile Exhaust Purification Catalysts by Inductively Coupled Plasma Emission Spectrometry
British Standards Institution (BSI), atomic metal catalyst
- BS EN ISO 11212-4:1997 Starch and derived products - Heavy metals content - Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization
- BS EN ISO 11212-3:1997 Starch and derived products. Heavy metals content. Determination of lead content by atomic absorption spectrometry with electrothermal atomization
- BS EN 27627-1:1993 Hardmetals. Chemical analysis by flame atomic absorption spectrometry. General requirements
- BS EN 10177:2019 Chemical Analysis of Ferrous Materials Determination of Calcium in Steels Flame Atomic Absorption Spectrometric Method
SE-SIS, atomic metal catalyst
- SIS SS 02 81 49-1980 Metal content of water, sludge and sediment determined by atomic absorption spectroscopy, atomization in flame — Solvent extraction
- SIS SS-EN 24 943-1991 Chemical analysis of ferrous metal — Deter- mination of copper content — Flame atomic absorption spectrometric method
- SIS SS-EN 10 181-1989 Chemical analysis of ferrous materials — Determination of lead in steels — Flame atomic absorption spectrometric method
- SIS SS-EN 10 188-1990 Chemical analysis of ferrous materials — Determination of chromium in steels and irons — Flame atomic absorption spectro- metric method
- SIS SS-EN 10 177-1989 Chemical analysis of ferrous materials — Determination of calcium in steels — Flame atomic absorption spectrometric method
NO-SN, atomic metal catalyst
- NS 4770-1994 Water analysis. Determination of metals by atomic absorption spectrometry, atomization in flame. General principles and guidelines
CZ-CSN, atomic metal catalyst
- CSN 42 0648 Cast.4-1986 Chemical analysis of metallic chromium. Determination of iron by the photometric and the atomic absorption method methods
- CSN 42 0613 Cast.11-1974 Chemical analysis of bearing lead and calcium metala. Determination of iron by atomic absorption
- CSN 42 0648 Cast.10-1986 Chemical analysis of metallic chromium. Determination of aluminum by titration and atomic absorption method
- CSN 42 0648 Cast.6-1986 Chemical analysis of metallic chromium. Determination of copper by the photometric and the atomic absorption method methods
Henan Provincial Standard of the People's Republic of China, atomic metal catalyst
- DB41/T 1189-2016 Analysis of Chemical Composition of Polymetallic Minerals by Inductively Coupled Plasma-Atomic Emission Spectrometry
Korean Agency for Technology and Standards (KATS), atomic metal catalyst
- KS H ISO 11212-3:2008 Starch and derived products－Heavy metals content－Part 3：Determination of lead content by atomic absorption spectrometry with electrothermal atomization
- KS H ISO 11212-4-2008(2018) Starch and derived products－Heavy metals content－Part 4：Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization
- KS H ISO 11212-3-2008(2018) Starch and derived products－Heavy metals content－Part 3：Determination of lead content by atomic absorption spectrometry with electrothermal atomization
- KS M ISO 2069:2002 Aluminium oxide primarily used for the production of aluminium-Determination of calcium content-Flame atomic absorption method
- KS M ISO 2071:2002 Aluminium oxide primarily used for the production of aluminium-Determination of zinc content-Flame atomic absorption method
- KS M ISO 3390:2002 Aluminium oxide primarily used for the production of aluminium－Determination of manganese content－Flame atomic absorption method
- KS M ISO 2069:2013 Aluminium oxide primarily used for the production of aluminium－Determination of calcium content－Flame atomic absorption method
- KS M ISO 2071:2013 Aluminium oxide primarily used for the production of aluminium－Determination of zinc content－Flame atomic absorption method
- KS M ISO 3390:2017 Aluminium oxide primarily used for the production of aluminiumDetermination of manganese content-Flame atomic absorption method
- KS H ISO 11212-4:2008 Starch and derived products-Heavy metals content-Part 4:Determination of cadmium content by atomic absorption spectrometry with electrothermal atomization
- KS E ISO 15249-2011(2016) Zinc sulfide concentrates－Determination of gold content－Acid dissolution/solvent extraction/flame atomic absorption spectrometric method
- KS E ISO 15249:2021 Zinc sulfide concentrates — Determination of gold content —Acid dissolution/solvent extraction/flame atomic absorption spectrometric method
ES-AENOR, atomic metal catalyst
Association Francaise de Normalisation, atomic metal catalyst
- NF EN 27627-6:1993 Métaux-durs - Analyse chimique par spectrométrie d'absorption atomique dans la flamme - Partie 6 : dosage du chrome à des teneurs comprises entre 0,01 et 2 % (M/M).
- NF A08-001:1979 Analyse chimique des métaux et alliages légers - Application de la spectrométrie d'absorption atomique à l'analyse de l'aluminium, du magnésium et de leurs alliages
- NF EN 27627-1:1993 Métaux-durs - Analyse chimique par spectrométrie d'absorption atomique dans la flamme - Partie 1 : caractéristiques générales.
- NF A08-313:1995 Chemical analysis of ferrous materials. Determination of titanium in steel and iron. Flame atomic absorption spectrometric method.
- NF EN 27627-4:1993 Métaux-durs - Analyse chimique par spectrométrie d'absorption atomique dans la flamme - Partie 4 : dosages du molybdène, du titane et du vanadium à des teneurs comprises entre 0,01 et 0,5 % (m/m).
- NF A08-361:1989 Chemical analysis of ferrous materials. Determination of calcium in steels. Flame atomic absorption spectrometric method.
- NF EN 12441-9:2005 Zinc et alliages de zinc - Analyse chimique - Partie 9 : dosage du nickel dans les alliages de zinc - Méthode par spectrométrie d'absorption atomique dans la flamme
- NF A08-328*NF EN 10188:1989 Chemical analysis of ferrous materials. Determination of chromium in steels and irons. Flame atomic absorption spectrometric method.
Danish Standards Foundation, atomic metal catalyst
- DS 2211:1990 Water analysis. Determination of metals in water, sludge and sediment determined by flameless atomic absorption spectrometry. Electrothermal atomization in graphite furnace. Special guidelines for Aluminium, Cadmium, Cobalt, chromium, Copper, mangane
- DS 2210:1990 Water analysis. Determination of metals in water, sludge, and sedimend by flameless atomic absorption spectrometry. Electrothermal atomization in graphite furnace. General principles and guidelines
- DS/EN 10136:1989 Chemical analysis of ferrous materials - Determination of nickel in steels and irons - Flame atomic absorption spectrometric method
- DS/EN 10211:1996 Chemical analysis of ferrous materials - Determination of titanium in steel and iron - Flame atomic absorption spectrometric method
RO-ASRO, atomic metal catalyst
- STAS SR EN 24943-1994 Chemical analysis of ferrous metal. Determination of copper content. Flame atomic absorption spectrometric method
- STAS SR EN 10188-1994 Chemical analysis of ferrous materials. Determination of chromium in steels and irons. Flame atomic absorption spectrometric method
PL-PKN, atomic metal catalyst
- PN EN 24943-1992 Chemical analysis of ferrous metal. Determination of copper content. Flame atomic absorption spectrometric method
- PN EN 10181-1992 Chemical analysis of ferrous materials. Determination of lead in steels. Flame atomic absorption spectrometric method
- PN EN 10177-1993 Chemical analysis of ferrous materials Determination of calcium in steels Flame atomie absorption spectrometric method
- PN EN 10136-1992 Chemical analysis of ferrous materials. Determination of knickel in steels and irons. Flame atomic absorption spectrometric method
- PN EN 10188-1992 Chemical analysis of ferrous materials Determination of chromi um in steels and irons Flame atomie absorption spectrometric inethod
AENOR, atomic metal catalyst
- UNE 36329-1:1991 CHEMICAL ANALYSIS OF FERROUS METAL. DETERMINATION OF COPPER CONTENT. FLAME ATOMIC ABSORPTION SPECTROMETRIC METHOD.
- UNE 36339-1:1989 Chemical analysis of ferrous materials - Determination of lead in steels - Flame atomic absorption spectrometric method
- UNE 36320-1:1989 Chemical analysis of ferrous materials - Determination of calcium in steels - Flame atomic absorption spectrometric method
- UNE 36326-1:1989 Chemical analysis of ferrous materials - Determination of nickel in steels and irons - Flame atomic absorption spectrometric method
- UNE 36324-1:1991 Chemical analysis of ferrous materials - Determination of chromium in steels and irons - Flame atomic absorption spectrometric method
- UNE 81569:1991 AIR QUALITY. WORKPLACE ATMOSPHERES. DETERMINATION OF METALLIC LEAD AND THEIR IONIC COMPOUNDS. FLAME ATOMIC ABSORPTION SPECTROMETRIC METHOD.
Lithuanian Standards Office , atomic metal catalyst
- LST EN 10181-2000 Chemical analysis of ferrous materials - Determination of lead in steels - Flame atomic absorption spectrometric method
- LST EN 10177-2000 Chemical analysis of ferrous materials - Determination of calcium in steels - Flame atomic absorption spectrometric method
- LST EN 10136-2000 Chemical analysis of ferrous materials - Determination of nickel in steels and irons - Flame atomic absorption spectrometric method
- LST EN 24943-2000 Chemical analysis of ferrous metal - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:1985)
- LST EN 10188-2000 Chemical analysis of ferrous materials - Determination of chromium in steels and irons - Flame atomic absorption spectrometric method
- LST EN 10211-2000 Chemical analysis of ferrous materials - Determination of titanium in steel and iron - Flame atomic absorption spectrometric method
European Committee for Standardization (CEN), atomic metal catalyst
- CEN/TR 10362:2014 Chemical analysis of ferrous materials - Determination of selenium in steels - Electrothermal atomic absorption spectrometric method
- EN 10177:1989 Chemical Analysis of Ferrous Materials Determination of Calcium in Steels Flame Atomic Absorption Spectrometric Method
- EN 24943:1990 Steel and cast iron ?Determination of copper content ?Flame atomic absorption spectrometric method
- PD CEN/TR 10362:2014 Chemical analysis of ferrous materials - Determination of selenium in steels - Electrothermal atomic absorption spectrometric method
- EN 10047:1989 Chemical Analysis of Ferrous Materials Determination of Calcium in Steels Flame Atomic Absorption Spectrometric Method
- EN 10188:1989 Chemical Analysis of Ferrous Materials Determination of Chromium in Steels and Irons Flame Atomic Absorption Spectrometic Method
KR-KS, atomic metal catalyst
- KS D 1813-2003(2023) Chemical analysis of ferrous materials determination of lead in steels－Flame atomic absorption spectrometric method
- KS E ISO 15249-2021 Zinc sulfide concentrates — Determination of gold content —Acid dissolution/solvent extraction/flame atomic absorption spectrometric method
未注明发布机构, atomic metal catalyst
- DIN EN 10211:1996 Chemical analysis of ferrous materials – Determination of titanium in steel and iron — Flame atomic absorption spectrometric method
International Organization for Standardization (ISO), atomic metal catalyst
- ISO 15249:1998 Zinc sulfide concentrates - Determination of gold content - Acid dissolution/solvent extraction/flame atomic absorption spectrometric method