Designation:D5954−98(Reapproved2014)´1StandardTestMethodforMercurySamplingandMeasurementinNaturalGasbyAtomicAbsorptionSpectroscopy1ThisstandardisissuedunderthefixeddesignationD5954;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ε1NOTE—MercurycaveatwasaddededitoriallytotheScopeinApril2014.1.Scope1.1Thistestcoversthedeterminationoftotalmercuryinnaturalgasatconcentrationsdownto1ng/m3.Itincludesseparateproceduresforbothsamplingandatomicabsorptionspectrophotometricdeterminationofmercury.Theproceduredetectsbothinorganicandorganicformsofmercury.1.2ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.3Warning:Mercuryhasbeendesignatedbymanyregu-latoryagenciesasahazardousmaterialthatcancauseseriousmedicalissues.Mercury,oritsvapor,hasbeendemonstratedtobehazardoustohealthandcorrosivetomaterials.Cautionshouldbetakenwhenhandlingmercuryandmercurycontain-ingproducts.SeetheapplicableproductSafetyDataSheet(SDS)foradditionalinformation.Usersshouldbeawarethatsellingmercuryand/ormercurycontainingproductsintoyourstateorcountrymaybeprohibitedbylaw.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1193SpecificationforReagentWater3.SummaryofTestMethod3.1Mercuryinagasstreamisadsorbedontogold-coatedsilicabeadsandsubsequentlydirectlydesorbedbyheatintoalongpath-lengthquartzcellconnectedtoanatomicabsorptionspectrophotometer.Mercuryatomsaredetectedbymeasuringtheirabsorbanceoflightfromamercurysourcelampatacharacteristicwavelength.Themercuryconcentrationisob-tainedfromtheabsorbancepeakareabycomparisontostandardspreparedatthetimeofanalysis.4.Significanceand...
