ASTM_E_2575_-_08.pdf

Designation:E257508Standard Test Method forDetermination of Oxygen in Copper and Copper Alloys1This standard is issued under the fixed designation E2575;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of oxygen incopper and copper alloys in concentrations from 0.0005 to0.04%.1.2 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2E50 Practices for Apparatus,Reagents,and Safety Consid-erations for Chemical Analysis of Metals,Ores,andRelated MaterialsE135 Terminology Relating to Analytical Chemistry forMetals,Ores,and Related MaterialsE882 Guide for Accountability and Quality Control in theChemical Analysis LaboratoryE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion TechniquesE1601 Practice for Conducting an Interlaboratory Study toEvaluate the Performance of an Analytical MethodIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System2.2 Material Certificates:BCR No.18 Oxygen in Phosphorus-Deoxidized Copper3BCR No.22 Oxygen in ETP Copper3BCR No.58 Oxygen in Continuous Cast Copper Rod3NCS NS 41004 Oxygen in Pure Copper4NIST SRM 885 Refined Copper53.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology E135.4.Summary of Test Method4.1 This test method is intended for use with commerciallyavailable inert gas fusion determinators.4.2 The test specimen is fused in a graphite crucible undera flowing inert gas stream(argon(Ar),helium(He),or nitrogen(N2)at a temperature sufficient to release oxygen.Oxygenfrom the specimen combines with carbon from the crucible toform carbon monoxide(CO).The detector output is convertedto the mass fraction of oxygen in the specimen using apreviously establish calibration.Depending on the instrumentdesign,CO is oxidized to carbon dioxide(CO2)or left as COand swept by the inert gas stream into an infrared detector.4.3 In a typical instrument based on infrared detection theevolved gases are swept into an infrared cell through whichinfrared energy is transmitted.The CO in the gas streamabsorbs some of the transmitted infrared energy and thedecrease in the energy reaching the detector is processed anddisplayed directly as percent oxygen.Some instruments oxi-dize the CO to CO2,which is subsequently measured by aninfrared cell designed to measure CO2.5.Significance and Use5.1 This test method is primarily intended as a referee testfor compliance with compositional specifications.It is assumedthat all who use this test method will be trained analysts,capable of performing common laboratory procedures skill-fully and safely.It is expected that work will be performed ina properly equipped laboratory.6.Interferences6.1 The elements usually present in copper and its alloys donot interfere.1This test method is under the jurisdiction of ASTM Committee E01 onAnalytical Chemistry for Metals,Ores,and Related Materials and is the directresponsibility of Subcommittee E01.05 on Cu,Pb,Zn,Cd,Sn,Be,their Alloys,andRelated Metals.Current edition approved March 1,2008.Published April 2008.DOI:10.1520/E2575-08.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from European Commission,Joint Research Centre,Institute forReference Materials and Measurements,Retieseweg 111,B-2440 Geel,Belgium,http:/irmm.jrc.ec.europa.eu/.4Available from Central Iron and Steel Research Institute(CISRI),No.76Xueyan Nanlu,Haidian District,Beijing,China 100081,http:/ from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 7.Apparatus7.1 InstrumentFusion and measurement apparatus con-sisting of an electrode furnace,provision for scrubbing impu-rities from analytical gas stream,infrared measurement system,and auxiliary gas purification systems.(See Note 1.)NOTE1The apparatus and analysis systems have been previouslydescribed in Test Method E1019.Several models of commercial oxygendeterminators are available and presently in use by industry.Each has itsown unique design characteristics and operational requirements.Consultthe instrument ma