英文版GBT 15072.17-2008国标《贵金属合金化学分析方法 铂合金中钨量的测定 三氧化钨重量法 》

PAGE\*MERGEFORMAT6ICS77.120.99H68NationalStandardofthePeople’sRepublicofChinaGB/T15072.17-2008ReplacesGB/T15072.17-1994TestmethodofpreciousmetalalloysDeterminationoftungstencontentforplatinumalloysTungsticacidgravimetry贵金属合金化学分析方法铂合金中钨量的测定三氧化钨重量法(EnglishTranslation)Issuedate:2008-03-31Implementationdate:2008-09-01IssuedbyGeneralAdministrationofQualitySupervision,InspectionandQuarantineofthepeople'sRepublicofChinaStandardizationAdministrationofthepeople'sRepublicofChinaForewordSAC/TC243isinchargeofthisEnglishtranslation.IncaseofanydoubtaboutthecontentsofEnglishtranslation,theChineseoriginalshallbeconsideredauthoritative.ThisstandardisanintegratedrevisionofGB/T15072-1994(Chemicalanalysismethodsforpreciousmetalsandtheiralloys)(allparts),whichisdividedinto19parts:—GB/T15072.1-2008TestmethodsofpreciousmetalalloysDeterminationofgoldcontentforgold,platinumandpalladiumalloysPotentiometrictitrationwithferroussulfate.—GB/T15072.2-2008TestmethodsofpreciousmetalalloysDeterminationofsilvercontentforsilveralloysPotentiometrictitrationwithsodiumchloride.—GB/T15072.3-2008TestmethodsofpreciousmetalalloysDeterminationofplatinumcontentforgold,platinumandpalladiumalloysCurrenttitrationwithpotassiumpermanganate.—GB/T15072.4-2008TestmethodsofpreciousmetalalloysDeterminationofpalladiumcontentforpalladiumandsilveralloysButanedionedioximegravimetry.—GB/T15072.5-2008TestmethodsofpreciousmetalalloysDeterminationofsilvercontentforgoldandpalladiumalloysPotentiometrictitrationwithpotassiumiodide.—GB/T15072.6-2008TestmethodsofpreciousmetalalloysDeterminationofiridiumcontentforplatinumandpalladiumalloysPotentiometrictitrationwithferroussulfate.—GB/T15072.7-2008TestmethodsofpreciousmetalalloysDeterminationofchromiumandironcontentsforgoldalloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.8-2008TestmethodsofpreciousmetalalloysDeterminationofcoppercontentforgold,palladiumandsilveralloysEDTAcomplexometricbacktitrationwiththioureaprecipitation.—GB/T15072.9-2008TestmethodsofpreciousmetalalloysDeterminationofindiumcontentforgoldalloysEDTAcomplexometricbacktitration.—GB/T15072.10-2008TestmethodsofpreciousmetalalloysDeterminationofnickelcontentforgoldalloysEDTAcomplexometricbacktitration.—GB/T15072.11-2008TestmethodsofpreciousmetalalloysDeterminationofgadoliniumandberylliumcontentsforgoldalloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.12-2008TestmethodsofpreciousmetalalloysDeterminationofvanadiumcontentforsilveralloysHydrogenperoxidespectrophotometry.—GB/T15072.13-2008TestmethodsofpreciousmetalalloysDeterminationoftin,ceriumandlanthanumcontentsinsilveralloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.14-2008TestmethodsofpreciousmetalalloysDeterminationofaluminiumandnickelcontentsforsilveralloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.15-2008TestmethodsofpreciousmetalalloysDeterminationofnickel,zincandmanganesecontentsforgold,silverandpalladiumalloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.16-2008TestmethodsofpreciousmetalalloysDeterminationofcopperandmanganesecontentsforgoldalloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.17-2008TestmethodsofpreciousmetalalloysDeterminationoftungstencontentforplatinumalloysTungstentrioxidegravimetry.—GB/T15072.18-2008TestmethodsofpreciousmetalalloysDeterminationofzirconiumandgalliumcontentsforgoldalloysInductivelycoupledplasmaatomicemissionspectrometry.—GB/T15072.19-2008TestmethodsofpreciousmetalalloysDeterminationofvanadiumandmagnesiumcontentsforsilveralloysInductivelycoupledplasmaatomicemissionspectrometry.ThispartistheseventeenthofGB/T15072-2008.ThispartreplacedGB/T15072.17-1994（MethodsforChemicalAnalysisofPreciousMetalsandTheirAlloysPalladiumalloysDeterminationoftungstencontent）.ThefollowingdeviationshavebeenmadewithrespecttotheGB/T15072.17-1994(thepreviousedition):—ThetitleofstandardischangedfromMethodsforChemicalAnalysisofPreciousMetalsandTheirAlloysPalladiumalloysDeterminationoftungstencontenttoTestmethodofpreciousmetalalloysDeterminationoftungstencontentforplatinumalloysTungsticacidgravimetry.—Thispartisdraftedinaccordancewiththerulesgiveninthenewdocumentincludingcompoundandconsistency.—ThescopeofthestandardisextendedfromPdW8,PdW8.5ofthepreviouseditiontothisstandardisapplicabletothedeterminationoftungstencontentforplatinumalloys.—ThispartisdraftedinaccordancewiththerulesgivenintheGB/T20001.4-2001.ThispartwaspreparedbySAC/TC243ChineseNonferrousMetalStandardizationTechnicalCommittee.ThispartisexplainedbythenationalnonferrousmetalStandardizationTechnicalCommittee.Thepreviouseditionofthisstandardisasfollow:—GB/T15072.17-1994.TestmethodofpreciousmetalalloysDeterminationoftungstencontentforplatinumalloysTungsticacidgravimetryScopeThispartspecifiesamethodforthedeterminationoftungstencontentinplatinumalloys.Thispartisapplicabletodeterminationoftungstencontentbetween7%-10%inPtWalloy.NormativereferencesThefollowingnormativedocumentscontainprovisionswhich,throughreferenceinthis,constituteprovisionsofthispart.Fordatedreferences,subsequentamendments(excludingcorrections),orrevisions,ofanyofthesepublicationsdonotapplytothispart.Howeverpartiestoagreementsbasedonthispartareencouragedtoinvestigatethepossibilityofapplyingthemostrecenteditionsofthenormativedocumentsindicatedbelow.Forundatedreferences,thelatesteditionofthenormativedocumentreferredtoapplies.YS/T371MethodsforchemicalanalysisofpreciousmetalsalloysGeneralrulesandregulations.MethodabstractThetestportionshallbedissolvedwithmixedacid,tungstenwasprecipitatedintoyellowtungstentrioxide.Theamountoftungstenwasdeterminedbygravimetricmethod.ReagentandmaterialUnlessotherwisenoted,reagentsandutensilareinaccordancewithYS/T371.4.1Hydrochloricacid(ρ1.19g/L).4.2Nitricacid(ρ1.42g/L).4.3Mixed acid:3unitvolumehydrochloricacidmixed with1unitvolumenitricacid(4.2),compoundasneeded.4.4Nitricacid(1+9).4.5Silver nitrate solution(10g/L).4.6Ammoniumhydroxide(1+1).SampleThesamplesshouldbeprocessedintofragments,removeoilstainswithacetone,washedwithwater,driedandmixedwell.Analysisprocedure6.1TestportionWeigh0.5gtestportionaccurateto0.00001g.6.2DeterminationofthenumberTwoindependentdeterminationsshouldberequired,andaveragetheresults.6.3BlanktestBlanktestshallbedonealongwiththetestportion.6.4Determination6.4.1Theportionshouldbeplacedina250mLbeaker,thencoverthesurfacedishandadd20mL~30mLofmixedacid,Heatingthesolutionatlowtemperatureontheelectricstove.Duringdissolution,mixedacidscanbeaddedrepeatedlyuntiltheblackparticlescan’tbeobserved,thatwasconsideredcompletelydissolved.Thesolutionshallbeevaporatedtoabout10mL,thenremoveandcooltoroomtemperature.6.4.2Adding30mLwater,Thesolutionshallbefilteredbyadoublelayerofdenseashlessfilterpaperinaφ5cmfunnel.Washingthebeakerfourtimeswithnitricacid(4.4),about6mLeachtime,Scrubbingtheedgeofthebeakerwithaglassrodwithrubberhead,theprecipitationshallbetransferredintoafunnelasmanyaspossible,washingthebeakerwithnitricacid(4.4)andprecipitateuntiltheycan’thavechlorideions(silvernitratesolutiontest).Theprecipitateandfilterpapershallbetransferredintotheconstantweightcrucible.Theoriginalbeakershallbedriedatlowtemperature,andthetungsticacidadheringofthebeakerwallshallbeswabbedwithasmallpieceofashlessfilterpaperwhichhasbeenwettedbyammoniawater,itshallberepeatedthreetimes.Putthefilterpaperintotheoriginalcrucible.6.4.3Dryingthecrucibleandfilterpaperatlowtemperature,ashandburnat850℃for20min.Removingandcoolslightly.Placeinadryerfor60minandthenweigh.Thecrucibleandfilterpapershallbeburnedagainuntiltheywereconstantweight.7CalculationofanalysisresultsThemassfractionoftungstenωWshouldbecalculatedaccordingtoformula(1),andthevalueisexpressedas%:.ωW=（m1-m2）×0.7930m0×100----------------------(1)Intheformula:m1isthemassoftungsten trioxideandcrucibleingrams(g).m2isthemassofthecrucibleingrams(g).m0isthemassofportioningrams(g).0.3161istheconversionoftungsten trioxidetotungsten.Theresultsshouldbeexpressedtotwodecimalplaces.8Tolerance1Thedifferencebetweenlaboratoryanalysisresultsshouldnotbegreaterthan0.10%.