ASTM_E_2824_-_11.pdf

Designation:E282411Standard Test Method forDetermination of Beryllium in Copper-Beryllium Alloys byPhosphate Gravimetric Method1This standard is issued under the fixed designation E2824;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 describes the determination of beryl-lium in copper-beryllium alloys in percentages from 0.1%to3.0%by the phosphate gravimetric method.1.2 UnitsThe values stated in SI units are to be regardedas standard.No other units of measurement are included in thisstandard.1.3 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.Specific hazardstatements are given in Section 9.2.Referenced Documents2.1 ASTM Standards:2E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE50 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 MaterialsE173 Practice for Conducting Interlaboratory Studies ofMethods for Chemical Analysis of Metals(Withdrawn1998)3E255 Practice for Sampling Copper and Copper Alloys forthe Determination of Chemical CompositionE1601 Practice for Conducting an Interlaboratory Study toEvaluate the Performance of an Analytical Method3.Terminology3.1 For definitions of terms used in this method,refer toTerminology E135.4.Summary of Test Method4.1 Beryllium is precipitated as the phosphate,which isfiltered,ignited,and weighed as beryllium pyrophosphate.Interfering elements,if present,may be complexed with(ethylenedinitrilo)tetraacetate solution.5.Significance and Use5.1 This test method for the chemical analysis of metals andalloys is primarily intended to test such materials for compli-ance with compositional specifications.It is assumed that allwho use these test methods will be trained analysts capable ofperforming common laboratory procedures skillfully andsafely.It is expected that work will be performed in a properlyequipped laboratory.6.Interferences6.1 The elements ordinarily present in beryllium-copperalloys do not interfere.7.Apparatus7.1 Electrodes for ElectroanalysisRecommended station-ary type platinum electrodes are described in 7.1.1 and 7.1.2.The surface of the platinum electrode should be smooth,clean,and bright to promote uniform deposition and good adherence.Deviations from the exact size and shape are allowable.Ininstances where it is desirable to decrease the time of deposi-tion and agitation of the electrolyte is permissible,a generallyavailable rotating type of electrode may be employed.Cleaningof the electrode by sandblasting is not recommended.7.1.1 CathodesPlatinum cathodes may be either open orclosed cylinders formed from sheets that are plain orperforated,or from gauze.Gauze cathodes are recommended;preferably from 50-mesh gauze woven from approximately0.21 mm diameter wire.The top and bottom of gauze cathodesshould be reinforced by doubling the gauze about 3 mm ontoitself,or by the use of platinum bands or rings.The cylindershould be approximately 30 mm in diameter and 50 mm inheight.The stem should be made from a platinum alloy wire1This 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 May 1,2011.Published July 2011.DOI:10.1520/E2824-11.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 such as platinum-iridium,platinum-rhodium,or platinum-ruthenium,having a diameter of approximately 1.3 mm.Itshould be flattened and welded the entire length of the gauze.The overall height of the cathode should be approximately 130mm.A cathode of these dimensions will have a surface area of135 cm2exclusive of the stem.7.1.2 AnodesPlatinum anodes may be a spiral type whenanodic deposits are not being determined,or if the deposits aresmall(as in the electrolytic determination of lead when it ispresent in concentrations below 0.2%).Spiral anodes shouldbe made from 1.0 mm or larger platinum wire formed into aspiral of seven turns havin