ASTM_D_7623_-_10_2015.pdf

Designation:D762310(Reapproved 2015)Standard Test Method forTotal Mercury in Crude Oil Using Combustion-GoldAmalgamation and Cold Vapor Atomic Absorption Method1This standard is issued under the fixed designation D7623;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 procedures to determine thetotal mercury content in a sample of crude oil.1.2 The test method may be applied to crude oil samplescontaining between 5 ng mL to 400 ng mL of mercury.Theresults may be converted to mass basis,and reported as ng/g ofmercury.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 AnalysisD7622 Test Method for Total Mercury in Crude Oil UsingCombustion and Direct Cold Vapor Atomic AbsorptionMethod with Zeeman Background Correction3.Terminology3.1 For definitions of terms used in this standard,refer toTerminology D4175.4.Summary of Test Method4.1 Controlled heating of the analysis sample in oxygen isused to liberate mercury.The sample is heated to dryness in theinstrument and then thermally(at about 700 C)and chemi-cally decomposed.The decomposition products are carried byflowing treated air to the catalytic section of the furnace(atabout 850 C),where oxidation is completed.The decomposi-tion products are carried to a gold amalgamator that selectivelytraps mercury.After the system is flushed with oxygen toremove any remaining decomposition products other thanmercury,the amalgamator is rapidly heated to about 600 C,releasing mercury vapor.Flowing oxygen carries the mercuryvapor through absorbance cells positioned in the light path ofsingle wavelength cold vapor atomic absorption spectropho-tometer.Absorbance peak height or peak area,as a function ofmercury concentration,is measured at 253.65 m.NOTE1Mercury and mercury salts can be volatized at low tempera-tures.Precautions against inadvertent mercury loss should be taken whenusing this test method.1This 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 D7623 10.DOI:10.1520/D7623-10R15.2For 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 5.Significance and Use5.1 The emission of mercury during crude oil refining is anenvironmental concern.The emission of mercury may alsocontaminate refined products and form amalgams with metals,such as aluminum.5.2 When representative test portions are analyzed accord-ing to this procedure,the total mercury is representative ofconcentrations in the sample.6.Apparatus6.1 There are several configurations of the instrumentalcomponents that can be used satisfactorily for this testmethod.3Functionally,the inst