Designation:D4765−13StandardTestMethodforMeasurementofFluoridesinWorkplaceAtmospheresbyIon-SelectiveElectrodes1ThisstandardisissuedunderthefixeddesignationD4765;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthesimultaneouscollectionandseparatemeasurementsofgaseousfluoride(forexample,hydrogenfluoride)andparticulatefluoridefoundincertainindustrialworkplaces.Thegaseousfluoridesandparticulatefluoridescollectedarereportedintermsoffluoride.Themethodcoverssamplecollection,preparation,andfluoridemeasurement.1.2Theprocedureisnotapplicabletothecollectionoranalysisofgaseousfluorocompounds(forexample,fluorocar-bonorfluorosulfurcompounds).1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWaterD1356TerminologyRelatingtoSamplingandAnalysisofAtmospheresD4840GuideforSampleChain-of-CustodyProceduresD5337PracticeforFlowRateAdjustmentofPersonalSam-plingPumpsE1370GuideforAirSamplingStrategiesforWorkerandWorkplaceProtection3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1356.4.SummaryofTestMethod4.1Particulatematerialfromameasuredvolumeofairiscollectedbymeansofamembranefilter.Gaseousfluoride,fromthesampleofair,isabsorbedbyanalkali-impregnatedcellulosepadplacedbehindthemembranefilter.Themem-branefilterandcollectedsolidsaremadealkaline,ashed,andtheresiduefusedwithadditionalalkali.Finally,thefluorideisdeterminedinasolutionofthemeltbyuseofafluorideion-selectiveelectrode.Gaseousfluorideisdeterminedinan...
