ZH
RU
ES

Copper absorption spectrum

Copper absorption spectrum, Total:162 items.

In the international standard classification, Copper absorption spectrum involves: Non-ferrous metals, Soil quality. Pedology, Laboratory medicine, Rubber, Metalliferous minerals, Water quality, Analytical chemistry, Ferrous metals, Ferroalloys, Farming and forestry, Testing of metals, Fruits. Vegetables, Surface treatment and coating, Animal feeding stuffs, Corrosion of metals, Fertilizers, Fuels, Organic chemicals.

CZ-CSN, Copper absorption spectrum

CSN 65 2062-1981 SODIUM HYDROXIDE TECHNICAL Atomic Absorbtion Speetroscopy for Determination of Copper
CSN 65 2475-1981 Sodium Chloride (Salt) Method of Atomie Absorption Spectroscophy of Copper Content Determination
CSN 42 0614 Cast.5-1974 Chemical analysis of tin-lead solders. Determination of copper by atomic absorption spectrometry
CSN 42 0648 Cast.6-1986 Chemical analysis of metallic chromium. Determination of copper by the photometric and the atomic absorption method methods

Japanese Industrial Standards Committee (JISC), Copper absorption spectrum

JIS H 1291:1977 Method for atomic absorption spectrochemical analysis of copper and copper alloys

Indonesia Standards, Copper absorption spectrum

SNI 06-6992.5-2004 Sediment - Part 5: Test methods of copper (Cu) with acid destruction by atomic absorption spectrophotometers (AAS)

Professional Standard - Hygiene , Copper absorption spectrum

WS/T 94-1996 Urine.Determination of copper.Graphite furnace atomic absorption spectrometry method

中华人民共和国国家卫生和计划生育委员会, Copper absorption spectrum

WS/T 93-1996 Serum.Determination of copper.Flame atomic absorption spectrometry method

RU-GOST R, Copper absorption spectrum

GOST 23859.11-1990 Heat-resistant bronze. Determination of chromium, nickel, cobalt, iron, zinc, magnesium and titanium by method of atomic-absorption spectrometry
GOST R ISO 4943-2010 Steel and iron. Determination of copper content. Flame atomic absorption spectrometric method
GOST 32343-2013 Feeds, compound feeds. Determination of calcium, copper, iron, magnesium, manganese, of potassium, sodium and zinc by atomic absorption spectrometry method

YU-JUS, Copper absorption spectrum

JUS C.A1.631-1987 Copper and cooper a/loys. Determination of silver content. Flame atomic absorption spectrometric me-thod
JUS C.A1.627-1989 Copper and capper alloys. Deteruiuation of tellurium content (lotf contents). Flame atomic absorption spectrometrlc method
JUS C.A1.235-1990 Metbods for cbemical aualysis of cadmium. Determination of copper content. Flame atomic absorption svectrometric metbo?
JUS C.A1.364-1982 Methods for chemical analysis of zinc and zinc alloys. Determination of copper by atomic absorption spec troph o tometry
JUS C.A1.264-1978 Methods for chemical analysis oj alummtum and ahtmintum alloys. Determination ofcopper by atomic absorption
JUS C.A1.623-1985 Methods for chemical analysis of copper and copper alloys. Determination ofcadmium in copper alloys by atomic absorption spectrophotometn/

General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China, Copper absorption spectrum

GB/T 7043.1-2001 Rubber--Determination of copper content by atomic absorption spectrometry
GB/T 5059.3-2014 Ferromolybdenum.Determination of copper content.The flame atomic absorption spectrometric method
GB/T 6730.36-2016 Iron ores.Determination of copper content.Flame atomic absorption spectrometric method
GB/T 14637-2007 Industrial circulating cooling water and scale.Determination of copper,zinc.Atomic absorption spectrometric method
GB/T 14638.1-1993 Industrial circulating cooling water--Determination of copper--Atomic absorption spectrometry
GB/T 11067.2-2006 Methods for chemical analysis of silver. Determination of copper contents. Flame atomic absorption spectrometric method
GB/T 20931.10-2007 Methods for chemical analysis of lithium Determination of copper content Flame atomic absorption spectrometric method
GB/T 7731.15-1999 Methods for chemical analysis of ferrotungsten-The flame atomic absorption spectrometric method for the determination of copper content
GB/T 14638.2-1993 Scale in industrial circulating cooling water--Determi copper--Atomic absorption spectrometry
GB/T 11067.2-1989 Silver--Determination of copper and gold contents--Flame atomic absorption spectrometric method
GB 11067.2-1989 Silver—Determination of copper and gold contents—Flame atomic absorption spectrometric method
GB/T 4701.3-2009 Ferrotitanium-Determination of copper content-The DDTC photometric method and the flame atomic absorption spectrometric method
GB/T 13885-1992 Method for the determination of the iron、copper、manganese、zinc and magnesium in feedstuffs—Atomic absorption spectroscopy
GB/T 1819.14-2006 Methods for chemical analysis of tin concentrates. Determination of copper content. Flame atomic absorption spectrometric method
GB/T 6150.9-2009 Methods for chemical analysis of tungsten concentrates.Determination of copper content.Flame atomic absorption spectrometry
GB/T 8152.7-2006 Methods for chemical analysis of lead concentrates. Determination of copper content. Flame atomic absorption spectrometric method
GB/T 11066.4-1989 Gold--Determination of copper, lead, bismuth and antimony contents--Flame atomic absorption spectrometric method
GB/T 12689.9-1990 Zinc and zinc alloys--Determination of copper content--Flame atomic absorption spectrometric method
GB/T 6987.3-2001 Aluminium and aluminium alloys--Determination of copper content--Falme atomic absorption spectrometric method
GB/T 14849.8-2015 Methods for chemical analysis of silicon metal.Part 8:Determination of copper content.Atomic absorption spectrometric method
GB/T 4324.10-2012 Methods for chemical analysis of tungsten.Part 10:Determination of copper content.Flame atomic absorption spectrometry
GB/T 4325.10-2013 Methods for chemical analysis of molybdenum.Part 10:Determination of copper content.Flame atomic absorption spectrometry
GB/T 3260.1-2013 Methods for chemical analysis of tin.Part 1:Determination of copper content.Flame atomic absorption spectrometric method
GB/T 13293.10-1991 Higher purity copper cathode.Determination of zinc content.Flame atomic absorption spectrometric method
GB/T 3253.5-2008 Methods for chemical analysis of antimony and antimony trioxide.Determination of copper content.Flame atomic absorption spectrophotometric method
GB/T 8151.6-2012 Methods for chemical analysis of zinc concentrates.Part 6:Determination of copper content.The flame atomic absorption spectrometric method
GB/T 2466-2008 Pyrites and concentrate.Determination of copper content.Flame atomic absorption spectrometric and spectrophotometric methods

British Standards Institution (BSI), Copper absorption spectrum

BS ISO 5418-2:2006 Iron ores. Determination of copper - Flame atomic absorption spectrometric method
BS ISO 5418-2:2007 Iron ores - Determination of copper - Flame atomic absorption spectrometric method
BS EN 12441-3:2002 Zinc and zinc alloys - Chemical analysis - Determination of lead, cadmium and copper - Flame atomic absorption spectometric method
BS ISO 7530-1:2015 Nickel alloys. Flame atomic absorption spectrometric analysis. Determination of cobalt, chromium, copper, iron and manganese
BS EN ISO 4943:2022 Tracked Changes. Steel and cast iron. Determination of copper content. Flame atomic absorption spectrometric method
21/30385416 DC BS EN ISO 4943. Steel and cast iron. Determination of copper content. Flame atomic absorption spectrometric method
BS EN 16965:2018 Fertilizers. Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS)
BS 7020-10.2:1988 Analysis of iron ores - Methods for the determination of copper content - Flame atomic absorption spectrometric method
BS 6721-4:1986 Sampling and analysis of copper and copper alloys - Method for determination of chromium in copper and copper alloys by flame atomic absorption spectrophotometry

Association Francaise de Normalisation, Copper absorption spectrum

NF ISO 4693:1987 Minerais de fer - Dosage du cuivre - Méthode par spectrométrie d'absorption atomique dans la flamme.
NF EN 14084:2003 Produits alimentaires - Dosage des éléments traces - Détermination du plomb, du cadmium, du zinc, du cuivre et du fer par spectrométrie d'absorption atomique (AAS) après digestion par micro-ondes
NF EN 14941:2007 Cuivre et alliages de cuivre - Dosage du cobalt - Méthode par spectrométrie d'absorption dans la flamme (SAAF)
NF EN 14939:2007 Cuivre et alliages de cuivre - Dosage du béryllium - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)
NF EN 15915:2010 Cuivre et alliages de cuivre - Détermination de l'argent - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)
NF EN 15616:2013 Cuivre et alliages de cuivre - Détermination du cadmium - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)
NF EN 15025:2010 Cuivre et alliages de cuivre - Détermination du magnésium - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)
NF EN 15622:2010 Cuivre et alliages de cuivre - Dosage du plomb - Méthode par spectrométrie d'absorption atomique dans la flamme (SAAF)
NF A22-401:1977 Chemical analysis of manganese ores. Determination of copper, zinc and lead. Atomic absorption spectrometric method.
NF A08-336*NF EN 24943:1990 Steel and cast iron. Determination of copper content. Flame atomic absorption spectrometric method.
NF EN ISO 4943:2022 Aciers et fontes - Détermination de la teneur en cuivre - Méthode par spectrométrie d'absorption atomique dans la flamme
NF A20-602*NF ISO 4693:1987 Iron ores. Determination of copper content. Flame atomic absorption spectrometric method.
NF EN 16965:2018 Engrais - Dosage du cobalt, du cuivre, du fer, du manganèse et du zinc par spectrométrie d'absorption atomique de flamme (FAAS)
NF V05-127:1984 Fruits, légumes et produits dérivés - Détermination de la teneur en cuivre par spectrométrie d'absorption atomique avec flamme.
NF EN 14935:2007 Cuivre et alliages de cuivre - Dosage des impuretés dans le cuivre pur - Méthode par spectrométrie d'absorption atomique électrothermique (ET-AAS)
NF U42-465*NF EN 16965:2018 Fertilizers - Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS)
NF EN 15488:2007 Éthanol comme base de mélange à l'essence - Détermination de la teneur en cuivre - Méthode par spectrométrie d'absorption atomique avec four en graphite
NF A06-841-3*NF EN 12441-3:2002 Zinc and zinc alloys - Chemical analysis - Part 3 : determination of lead, cadmium and copper - Flame atomic absorption spectrometric method

Taiwan Provincial Standard of the People's Republic of China, Copper absorption spectrum

CNS 5464-1980 Method of Test for Copper in Water (Atomic Absorption, Direct)

GOSTR, Copper absorption spectrum

GOST 34241-2017 Jet fuels. Determination of copper by atomic absorption spectrometry with graphite furnace

Korean Agency for Technology and Standards (KATS), Copper absorption spectrum

KS D ISO 4749-2002(2017) Determination of lead content in copper alloys by flame atomic absorption spectrometric method
KS D ISO 4749-2002(2022) Determination of lead content in copper alloys by flame atomic absorption spectrometric method
KS D ISO 4943:2002 Steel and cast iron－Determination of copper content－Flame atomic absorption spectrometric method
KS D ISO 4943-2002(2022) Steel and cast iron－Determination of copper content－Flame atomic absorption spectrometric method
KS D ISO 4693-2002(2007) Iron ores－Determination of copper content－Flame atomic absorption spectrometric method
KS D ISO 4943-2002(2017) Steel and cast iron－Determination of copper content－Flame atomic absorption spectrometric method
KS D ISO 4693:2010 Iron ores－Determination of copper content－Flame atomic absorption spectrometric method

Professional Standard - Aviation, Copper absorption spectrum

HB 6731.1-1993 Determination of Copper Content in Aluminum Alloys by Atomic Absorption Spectrometry
HB/Z 5091.6-1999 Analysis method for chrome plating solution Determination of copper content through atomic absorption spectrometry
HB/Z 5088.6-1999 Analytical method of electroplating nickel solution Determination of copper content by atomic absorption spectrometry
HB/Z 5086.7-2000 Analytical method of copper cyanide electroplating solution Determination of lead content by atomic absorption spectrometry
HB/Z 5086.8-2000 Analytical method of copper cyanide electroplating solution Determination of silver content by atomic absorption spectrometry
HB/Z 5093.7-2000 Analytical method of alkaline electroplating tin solution Determination of copper content by atomic absorption spectrometry
HB/Z 5084.6-2000 Analytical method of cyanide electroplating zinc solution - Determination of copper content by atomic absorption spectrometry
HB 7266.5-1996 Analytical method of chemical composition of aluminum-lithium alloy Determination of copper content by atomic absorption spectrometry
HB/Z 5085.8-1999 Analytical method of cadmium electroplating solution in cyanide plating Determination of copper content by atomic absorption spectrometry
HB 5220.28-1995 Methods of Chemical Analysis of Superalloys - Determination of Copper Content by Flame Atomic Absorption Spectrometry
HB/Z 5086.9-2000 Analytical method of copper cyanide electroplating solution Determination of zinc and cadmium content by atomic absorption spectrometry
HB 5219.3-1998 Methods of chemical analysis of magnesium alloys - Determination of copper content by atomic absorption spectrometry
HB 6731.1-2005 Mtehods for spectromertic analysis of aluminium alloys--Part 1:Determination of copper content by flame atomic absorption spectrometric method
HB 7716.7-2002 Spectrometric analysis of titanium alloys Part 7:Determination of copper content-Flame atomic absorption spectrometric method

NL-NEN, Copper absorption spectrum

NEN 6451-1980 Water - Determination of copper content by atomic absorption spectrometry (flame technique)
NEN 6454-1981 Water - Determination of copper content by atomic absorption spectrometry (graphite furnace technique)
NEN 6371-1994 Vegetable and animal oils and fats. Determination of copper, iron and nickel contents by atomic absorption spectrometry. Graphite furnace method
NEN 6227-1983 Chemical analysis of iron and steel Determination of the copper content in iron and steel by atomic absorption spectrometry

Standard Association of Australia （SAA）, Copper absorption spectrum

AS 1515.5:1987 Copper alloys - Determination of cadmium - Flame atomic absorption spectrometric method
AS/NZS 1050.37:1994 Methods for the analysis of iron and steel - Determination of copper content - Flame atomic absorption spectrometric method

Jilin Provincial Standard of the People's Republic of China, Copper absorption spectrum

DB22/T 2344-2015 Determination of copper, iron, zinc and manganese in crop plants-Atomic absorption spectrometry

Anhui Provincial Standard of the People's Republic of China, Copper absorption spectrum

DB34/T 2879-2017 Methods for chemical analysis of copper slag tailings - Determination of copper content - Atomic absorption spectrometry

RO-ASRO, Copper absorption spectrum

STAS SR 8934-27-1997 Sodium chloride - Determination of copper content Flame atomic absorption spectrometric method
STAS SR 8965-2-1995 Water and steam from the boiler installations Copper content determination. Atomic absorption spectrometrical method
STAS SR ISO 5889:1983 Manganese ores and concentrates-Determination of atuminium. copper, lead and zinc contents-Flame atomic absorbtion spectrometric method
STAS SR EN 24943-1994 Chemical analysis of ferrous metal. Determination of copper content. Flame atomic absorption spectrometric method

Group Standards of the People's Republic of China, Copper absorption spectrum

T/CSTM 00057-2018 Nickel alloy—Determination of copper content—Flame atomic absorption spectrometric method
T/CSTM 01142-2022 Neodymium-iron-boron alloy—Determination of copper content —Flame atomic absorption spectrometric method

International Organization for Standardization (ISO), Copper absorption spectrum

ISO 4693:1986 Iron ores; Determination of copper content; Flame atomic absorption spectrometric method
ISO 4943:1985 Steel and cast iron; Determination of copper content; Flame atomic absorption spectrometric method
ISO 7952:1994 Fruits, vegetables and derived products - Determination of copper content - Method using flame atomic absorption spectrometry
ISO 4943:2022 Steel and cast iron — Determination of copper content — Flame atomic absorption spectrometric method
ISO 7530-4:1990 Nickel alloys; flame atomic absorption spectrometric analysis; part 4: determination of copper content

Professional Standard - Petrochemical Industry, Copper absorption spectrum

SH/T 0102-1992 Determination of copper content in lubricating oils and liquid fuels (atomic absorption spectrometry)

European Committee for Standardization (CEN), Copper absorption spectrum

EN ISO 4943:2022 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:2022)
prEN ISO 4943:2021 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO/DIS 4943:2021)
EN 12441-3:2001 Zinc und zinc alloys - Chemical analysis - Part 3: Determination of lead, cadmium and copper; Flame atomic absorption spectrometric method
EN 24943:1990 Steel and cast iron ?Determination of copper content ?Flame atomic absorption spectrometric method

Danish Standards Foundation, Copper absorption spectrum

DS/EN 24 943:1991 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method
DS/ISO 4943:1991 Steel and cast iron. Determination of copper content. Flame atomic absorption spectrometric method
DS/EN 15488:2007 Ethanol as a blending component for petrol - Determination of copper content - Graphite furnace atomic absorption spectrometric method
DS/EN 12441-3:2002 Zinc and zinc alloys - Chemical analysis - Part 3: Determination of lead, cadmium and copper - Flame atomic absorption spectrometric method

German Institute for Standardization, Copper absorption spectrum

DIN EN ISO 4943:2023-01 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:2022); German version EN ISO 4943:2022
DIN EN 24943:1992 Determination of copper content of steel and cast iron by flame atomic absorption spectrometry (ISO 4943:1985); german version EN 24943:1990
DIN EN ISO 4943:2023 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:2022)
DIN EN 14935:2006-09 Copper and copper alloys - Determination of impurities in pure copper - ET AAS method; German version EN 14935:2006
DIN EN 16965:2018 Fertilizers - Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS)
DIN EN 16965:2018-03 Fertilizers - Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS); German version EN 16965:2018
DIN EN 12441-3:2002-02 Zinc und zinc alloys - Chemical analysis - Part 3: Determination of lead, cadmium and copper; Flame atomic absorption spectrometric method; German version EN 12441-3:2001

ES-UNE, Copper absorption spectrum

UNE-EN ISO 4943:2023 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:2022)
UNE-EN 16965:2019 Fertilizers - Determination of cobalt, copper, iron, manganese and zinc using flame atomic absorption spectrometry (FAAS)
UNE-EN 12441-3:2001 Zinc and zinc alloys - Chemical analysis - Part 3: Determination of lead, cadmium and copper - Flame atomic absorption spectrometric method

AENOR, Copper absorption spectrum

UNE 37253:1986 LEAD. DETERMINATION OF COPPER CONTENT. SPECTROMETRIC METHOD BY ATOMIC ABSORPTION TECHNIQUE.
UNE 36329-1:1991 CHEMICAL ANALYSIS OF FERROUS METAL. DETERMINATION OF COPPER CONTENT. FLAME ATOMIC ABSORPTION SPECTROMETRIC METHOD.
UNE-EN 15488:2008 Ethanol as a blending component for petrol - Determination of copper content - Graphite furnace atomic absorption spectrometric method

Professional Standard - Non-ferrous Metal, Copper absorption spectrum

YS/T 248.5-2007 Methods for chemical analysis of crude lead.Determination of copper content.Flame atomic absorption spectrometric method
YS/T 341.2-2006 Methods for chemical analysis of nickel concentrates-Determination of copper content-Flame atomic absorption spectrometric method
YS/T 226.8-2009 Methods for chemical analysis of selenium.Part 8:Determination of copper content.Flame atomic absorption spectrometry
YS/T 461.8-2003 The methods for chemical analysis of lead and zinc bulk concentrates-The determination of copper content-The atomic absorption method
YS/T 556.10-2011 Methods for chemical analysis of antimony concentrates.Part 10:Determination of copper content.Flame atomic absorption spectrometric method
YS/T 372.6-2006 Methods for elementary analysis of precious alloy. Determination of copper content and manganese contents. The flame atomic absorption spectrometric method
YS/T 281.11-2011 Methods for chemical analysis of cobalt.Part 11:Determination of copper and manganese contents.Flame atomic absorption spectrometry
YS/T 372.6-1994 Methods for elementary analysis of precious alloy. Determination of copper content and manganese contents. The flame 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, Copper absorption spectrum

GB/T 14637-2021 Determination of copper,iron and zinc in industrial circulating cooling water and scale—Atomic absorption spectrometric method
GB/T 15076.3-2019 Methods for chemical analysis of tantalum and niobium—Part 3：Determination of copper content—Flame atomic absorption spectrometry

Professional Standard - Rare Earth, Copper absorption spectrum

XB/T 601.4-1993 Methods of chemical analysis of lanthanum hexaboride - Determination of copper content by flame atomic absorption spectrometry

Lithuanian Standards Office , Copper absorption spectrum

LST EN 24943-2000/AC-2003 Steel and cast iron - Determination of copper content - Flame atomic absorption spectrometric method (ISO 4943:1985)
LST EN 15488-2007 Ethanol as a blending component for petrol - Determination of copper content - Graphite furnace atomic absorption spectrometric method
LST EN 12441-3-2002 Zinc and zinc alloys - Chemical analysis - Part 3: Determination of lead, cadmium and copper - 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)

Professional Standard - Commodity Inspection, Copper absorption spectrum

SN/T 2091-2008 Determination of lead,copper,iron and bismuth contents in antimony ingot for import and export.Atomic absorption spectrometric method

Professional Standard - Chemical Industry, Copper absorption spectrum

HG/T 4326-2012 Reclaimed water.Determination of nickel,copper,zinc,cadmium and lead.Atomic absorption spectromic method

American Society for Testing and Materials (ASTM), Copper absorption spectrum

ASTM E1898-21 Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry
ASTM E1898-13 Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry
ASTM E1898-97 Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry
ASTM E1898-02 Standard Test Method for Determination of Silver in Copper Concentrates by Flame Atomic Absorption Spectrometry

SE-SIS, Copper absorption spectrum

SIS SS-EN 24 943-1991 Chemical analysis of ferrous metal — Deter- mination of copper content — Flame atomic absorption spectrometric method

CEN - European Committee for Standardization, Copper absorption spectrum

EN 16965:2018 Fertilizers - Determination of cobalt@ copper@ iron@ manganese and zinc using flame atomic absorption spectrometry (FAAS)

PL-PKN, Copper absorption spectrum

PN EN 24943-1992 Chemical analysis of ferrous metal. Determination of copper content. Flame atomic absorption spectrometric method

工业和信息化部, Copper absorption spectrum

YS/T 1115.1-2016 Methods for chemical analysis of copper ores and tailings Part 1: Determination of copper content Flame atomic absorption spectrometry

中华人民共和国国家质量监督检验检疫总局、中国国家标准化管理委员会, Copper absorption spectrum

GB/T 1819.14-2017 Methods for chemical analysis of tin concentrates—Part 14：Determination of copper content—Flame atomic absorption spectrometry

Professional Standard-Ships, Copper absorption spectrum

CB/T 3905.6-2005 Method for chemical analysis of tin-base bearing alloy - Part 6: Atomic absorption spectrographic method for the determination of copper content