Designation:D7482−17StandardPracticeforSampling,Storage,andHandlingofHydrocarbonsforMercuryAnalysis1ThisstandardisissuedunderthefixeddesignationD7482;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoversthetypesofandpreparationofcontainersfoundmostsuitableforthehandlingofhydrocarbonsamplesforthedeterminationoftotalmercury.1.2ThispracticewasdevelopedforsamplingstreamswherethemercuryspeciationispredominantlyHg(0)presentasamixtureofdissolvedHg(0)atoms,adsorbedHg(0)onparticu-lates(forexample,carbonaceousormineralfinesandFe2O3)andsuspendeddropletsofmetallicmercury.1.3Thepresenceofsuspendeddropletsofmetallicmercury(oftencalled“colloidal”mercury,sincethedropletsizecanbeverysmall)canmakeobtainingarepresentativesampleverydifficultforavarietyofreasons(forexample,non-isokineticsamplingoftheliquidcanresultinover-orunder-collectionofsuspendeddropletsandcollectionofmercurythathasaccu-mulatedindenselargerdropsandpoolsonthebottomofpipingandinsampletaps).Paystrictattentiontothedetailedprocedure(Section7)toensurerepresentativesamplesarecollected.1.4Whenrepresentativetestportionsarecollectedandanalyzedinaccordancewithacceptableprocedures,thetotalmercuryisrepresentativeofconcentrationsinthesample.1.5ThevaluesstatedinSIunitsaretoberegardedasstandard.Nootherunitsofmeasurementareincludedinthisstandard.1.6Warning—MercuryhasbeendesignatedbyEPAandmanystateagenciesasahazardousmaterialthatcancausecentralnervoussystem,kidney,andliverdamage.Mercury,oritsvapor,maybehazardoustohealthandcorrosivetomaterials.Cautionshouldbetakenwhenhandlingmercuryandmercury-containingproducts.SeetheapplicableproductMa-terialSafetyDataSheet(MSDS)fordetailsandEPA’swebsite(http://www.epa.gov/mercury/faq.htm)foradditionalinforma-tion.Usersshouldbeawarethatsellingmercuryormercury-cont...
