ASTM_D_7622_-_10_2015.pdf

Designation:D762210(Reapproved 2015)Standard Test Method forTotal Mercury in Crude Oil Using Combustion and DirectCold Vapor Atomic Absorption Method with ZeemanBackground Correction1This standard is issued under the fixed designation D7622;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the procedure to determine thetotal mercury content in a sample of crude oil.This test methodcan be used for total mercury determination in natural andprocessed liquid and oil products(gasoline,naphtha,etc.).1.2 This test method may be applied to samples containingbetween 5.0 ngmL to 350 ng mL of mercury.The results maybe converted to mass basis.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 WARNINGMercury has been designated by manyregulatory agencies as a hazardous material that can causecentral nervous system,kidney and liver damage.Mercury,orits vapor,may be hazardous to health and corrosive tomaterials.Caution should be taken when handling mercury andmercury containing products.See the applicable product Ma-terial Safety Data Sheet(MSDS)for details and EPAswebsitehttp:/www.epa.gov/mercury/faq.htmfor addi-tional information.Users should be aware that selling mercuryand/or mercury containing products into your state or countrymay be prohibited by law.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum,PetroleumProducts,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesD7482 Practice for Sampling,Storage,and Handling ofHydrocarbons for Mercury AnalysisD7623 Test Method for Total Mercury in Crude Oil UsingCombustion-Gold Amalgamation and Cold Vapor AtomicAbsorption Method3.Terminology3.1 For definitions of terms used in this test method,refer toTerminology D4175.4.Summary of Test Method4.1 Controlled heating following thermal decomposition ofthe analysis sample in air is used to liberate mercury.Thesample is placed into the sample boat,which is inserted in thefirst chamber of the atomizer,where the sample is heated atcontrolled temperature at 300 C to 500 C(depending on theselected operation mode).The mercury compounds are evapo-rated and partially dissociated forming elemental mercuryvapor.Mercury and all decomposition products are carried tothe second chamber of the atomizer heated to about 700 C to750 C(mercury reduction takes place on the surface ofheating NiCr coil,thus no catalyst is required).Mercurycompounds are totally dissociated,and the organic matrix ofthe sample is burnt out.Continuously flowing air carriesmercury and other combustion products through absorbanceanalytical cell heated up to 750 C positioned in the light path1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved April 1,2015.Published June 2015.Originallyapproved in 2010.Last previous edition approved in 2010 as D7622 101.DOI:10.1520/D7622-10R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 of double-wave cold vapor Zeeman atomic absorption spectro-photometer.The mercury resonance line 253.65 nm is split toseveral components,one of those falling within the mercuryabsorbance line(analytical line)profile and another one lyingoutside(reference line).Difference between the intensities ofthese compounds is proportional to number of mercury atomsin the analytical cell.Absorbance peak area or peak height is afunction of the mercury concentration.NOTE1Mercury and mercury salts can be volatized at low tempera-tures.Precautions against inadvertent mercury loss sh