WPCF S - j_~(8aE)d)]oa<'NٮC"y;7boW\Owo:H,-O@GUl`LБzw}3p*{70i{a(Y.:kb. ^ _θ2M1{ьNR xV*yʶ:d`:6Mlهx_{e-Yy92Z gqhrPHJIFWmMJpTۨpe;jU0~Tp-73j⌤ ' ^Ѕ1> ĶNtLK+ ;mYX=7h :%RhQD'uvf;,tfZH֨럁mħ ~'9{ j*fHVW 9H֢)w[D (\Ĝ1* #UNy % 0:N^ w4- m/#|xHP LaserJet 2200 Series PCL 60(9 Z6Times New Roman RegularX($USUS.,jm- V,ertyBarP U !USUS.,  _TITLE  StackSamplingMethodsforHalogensandHalogenAcids  AUTHOR(S) t LarryD.Johnson ` PERFORMINGORGANIZATIONNAMEANDADDRESS 8  NationalExposureResearchLaboratory $ t OfficeofResearchandDevelopment  ` U.S.EnvironmentalProtectionAgency  L  ResearchTrianglePark,NC27711  8  SPONSORINGAGENCYNAMEANDADDRESS   NationalExposureResearchLaboratory   OfficeofResearchandDevelopment p U.S.EnvironmentalProtectionAgency \ ResearchTrianglePark,NC27711 H ABSTRACT  p EPAMethods26and26AandProposedMethods0050and0051arein  \ widespreaduseforcollectionand_quantitation_Ԁofstationarysource H emissionsofhalogensandhalogenacidsfromavarietyofsource 4 types.Considerableresearchhasbeenconductedinevaluationof   thesemethods,butresearchinformationaboutthemethodshasnot   beenpublishedinoneconvenientsummaryandmuchofthetechnical  communityisunawareofitsexistence.  Thispaperprovideshistoricalandscientificbackgroundforthe l EPAsamplingmethodsinusetoday,alongwithsomeoftheir X  strengthsandlimitations.Theprimaryevaluationstudiesare D! summarized,andpublicationreferencesaregiven.TheSW-846 0"  MethodsManualversionsoftheproceduresarecomparedwiththe #l! versionsfromCFR40part60.Relativelynewresearchworkis $X" summarized,alongwithrecentchangesinthemethods,andcritical $D # operatingfactors. %0!$