Designation:D5281–98StandardTestMethodforCollectionandAnalysisofHexavalentChromiuminAmbientAtmospheres1ThisstandardisissuedunderthefixeddesignationD5281;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthecollectionandmeasurementofhexavalentchromium[Cr(VI)]intheambientatmosphere.1.2Thistestmethodcollectsandstabilizesatmospherichexavalentchromiumusinganalkalineimpingerbuffersolu-tioninawetimpingementsamplingtechnique.Leadchromate[PbCrO4],generallyconsideredpoorlysolubleinwater,issolubleintheimpingersolutionupto940µg/Lashexavalentchromium.1.3Thistestmethodmeasureshexavalentchromiumusinganionchromatographicseparationcombinedwithapostseparationreactionwithacolorimetricreagentandphotometricdetection.1.4Thistestmethodisapplicableintherangefrom0.2to100ng/m3ofhexavalentchromiumintheatmosphereassum-ing20m3ofairsample.Therangecanbeextendedupwardsbyappropriatedilution.1.5ThevaluesstatedinSIunitsaretoberegardedasthestandard.Theinch-poundunitsgiveninparenthesesareforinformationonly.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:D1193SpecificationforReagentWater2D1356TerminologyRelatingtoSamplingandAnalysisofAtmospheres3D1357PracticeforPlanningtheSamplingoftheAmbientAtmosphere3D2914TestMethodsforSulfurDioxideContentoftheAtmosphere(West-GaekeMethod)3D3195PracticeforRotameterCalibration3D3586TestMethodforChromiuminWorkplaceAtmo-spheres(ColorimetricMethod)43.Terminology3.1Definitions:3.1.1Fordefinitionsoftermsusedinthistestmethod,refertoTerminologyD1356.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1eluent—theioni...
