ASTM-D1141-98(2003)海水代用品

Designation:D1141–98(Reapproved2003)AnAmericanNationalStandardStandardPracticeforthePreparationofSubstituteOceanWater1ThisstandardisissuedunderthefixeddesignationD1141;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.1.Scope1.1Thispracticecoversthepreparationofsolutionscon-taininginorganicsaltsinproportionsandconcentrationsrep-resentativeofoceanwater.2NOTE1—Sincetheconcentrationsofoceanwatervarieswithsamplinglocation,thegrossconcentrationemployedhereinisanaverageofmanyreliableindividualanalyses.Traceelements,occurringnaturallyincon-centrationsbelow0.005mg/L,arenotincluded.1.2Thispracticeprovidesthreestocksolutions,eachrela-tivelyconcentratedbutstableinstorage.Forpreparationofsubstituteoceanwater,aliquotsofthefirsttwostocksolutionswithaddedsaltarecombinedinlargervolume.Anaddedrefinementinadjustmentofheavymetalconcentrationisprovidedbytheadditionofasmallaliquotofthethirdstocksolutiontotheprevioussolution.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1129TerminologyRelatingtoWater3D1193SpecificationforReagentWater3E200PracticeforPreparation,Standardization,andStorageofStandardandReagentSolutionsforChemicalAnalysis43.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisprac-tice,refertoTerminologyD1129.3.2DefinitionOfTermSpecifictoThisStandard:3.2.1chlorinity,,n—theweightofsilverion(g)requiredtocompletelyprecipitatethehalidesin0.3285kgofwater(g/kg).4.SignificanceandUse4.1Thissubstituteoceanwatermaybeusedforlaboratorytestingwhereareproduciblesolutionsimulatingseawaterisrequired.Examplesarefortestsonoilcontamination,deter-gencyevaluation,andcorrosiontesting.NOTE2—Thelackoforganicmatter,suspendedmatter,andmarinelifeinthissolutiondoesnotpermitunqualifiedacceptanceoftestresultsasrepresentingperformanceinactualoceanwater.Wherecorrosionisinvolved,theresultsobtainedfromlaboratorytestsmaynotapproximatethosesecuredundernaturaltestingconditionsthatdiffergreatlyfromthoseofthelaboratory,andespeciallywhereeffectsofvelocity,saltatmospheres,ororganicconstituentsareinvolved.Alsotherapiddepletionofreactingelementspresentinlowconcentrationssuggestscautionindirectapplicationofresults.5.ReagentsandMaterials5.1PurityofReagents—Reagentgradechemicalsshallbeusedinalltests.Unlessotherwiseindicated,itisintendedthatallreagentsshallconformtothespecificationsoftheCommit-teeonAnalyticalReagentsoftheAmericanChemicalSociety.5Othergradesmaybeused,provideditisfirstascertainedthatthereagentisofsufficientlyhighpuritytopermititsusewithoutlesseningtheaccuracyofthedetermination.1ThispracticeisunderthejurisdictionofASTMCommitteeD19onWaterandistheresponsibilityofSubcommitteeD19.02onGeneralSpecifications,TechnicalResources,andStatisticalMethods.CurrenteditionapprovedAug.10,2003.PublishedSeptember2003.Originallyapprovedin1950.Lastpreviouseditionapprovedin1998asD1141–98e1.2Thispracticeisbaseduponthefollowingstudies:MayandBlack,“SyntheticOceanWater,”NavalResearchLaboratoryReportP-2909,August1946.May,T.P.andAlexander,A.L.,“SprayTestingwithNaturalandSyntheticSeaWater,PartI–CorrosionCharacteristicsintheTestingofMetals,”Proceedings,ASTM,Vol50,1950.Alexander,A.L.andMay,T.P.,“SprayTestingwithNaturalandSyntheticSeaWater,PartII–AStudyofOrganicCoatings,”Proceedings,ASTM,Vol50,1950.3AnnualBookofASTMStandards,Vol11.01.4AnnualBookofASTMStandards,Vol15.05.5ReagentChemicals,AmericanChemicalSocietySpecifications,AmericanChemicalSociety,Washington,DC.ForsuggestionsonthetestingofreagentsnotlistedbytheAmericanChemicalSociety,seeAnalarStandardsforLaboratoryChemicals,BDHLtd.,Poole,Dorset,U.K.,andtheUnitedStatesPharmacopeiaandNationalFormulary,U.S.PharmacopeialConvention,Inc.(USPC),Rockville,MD.1Copyright©ASTMInternational,100BarrHarborDrive,POBoxC700,WestConshohocken,PA19428-2959,UnitedStates.5.2PurityofWater—Unlessotherwiseindicated,referencestowatershallbeunderstoodtomeanreagentwaterconformingtoSpecificationD1193,TypeII.5.3SodiumHydroxide,Solution,Standard(0.10N)—Pre-pareandstandardizeasdirectedinPracticeE200.5.4StockSolutionNo.1—Dissolvetheindicatedamountsofthefollowingsaltsinwateranddilutetoatotalvolumeof7.0L.Storeinwellstopperedglasscontainers.MgCl2·6H2O3889.0g(=555.6g/L)CaCl2(anhydrous)405.6g(=57.9g/L)SrCl2·6H2O14.8g(=2.1g/L)5.5StockSolutionNo.2—Dissolvetheindicatedamountsofthefollowingsaltsinwateranddilutetoatotalvolumeof7.0Loraconvenientvolume.Storeinwellstopperedamberglasscontainers.KCl486.2g(=69.5g/L)NaHCO3140.7g(=20.1g/L)KBr70.4g(=10.0g/L)H3BO319.0g(=2.7g/L)NaF2.1g(=0.3g/L)5.6StockSolutionNo.3—Dissolvetheindicatedamountsofthefollowingsaltsinwateranddilutetoatotalvolumeof10.0L