1、Designation:D748215Standard Practice forSampling,Storage,and Handling of Hydrocarbons forMercury Analysis1This standard is issued under the fixed designation D7482;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revi
2、sion.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This practice covers the types of and preparation ofcontainers found most suitable for the handling of hydrocarbonsamples for the d
3、etermination of total mercury.1.2 This practice was developed for sampling streams wherethe mercury speciation is predominantly Hg(0)present as amixture of dissolved Hg(0)atoms,adsorbed Hg(0)on particu-lates(for example,carbonaceous or mineral fines and Fe2O3)and suspended droplets of metallic mercu
4、ry.1.3 The presence of suspended droplets of metallic mercury(often called“colloidal”mercury,since the droplet size can bevery small)can make obtaining a representative sample verydifficult for a variety of reasons(for example,non-isokineticsampling of the liquid can result in over-or under-collecti
5、on ofsuspended droplets and collection of mercury that has accu-mulated in dense larger drops and pools on the bottom ofpiping and in sample taps).Pay strict attention to the detailedprocedure(Section 7)to ensure representative samples arecollected.1.4 When representative test portions are collected
6、 andanalyzed in accordance with acceptable procedures,the totalmercury is representative of concentrations in the sample.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 WarningMercury has been designated by EPA andmany st
7、ate 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 She
8、et(MSDS)for details and EPAs website(http:/www.epa.gov/mercury/faq.htm)for additional informa-tion.Users should be aware that selling mercury or mercury-containing products,or both,in your state may be prohibited bystate law.1.7 This standard does not purport to address all of thesafety concerns,if
9、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:2D4175 Terminology Relating to Petroleum,PetroleumPr
10、oducts,and LubricantsD7622 Test Method for Total Mercury in Crude Oil UsingCombustion and Direct Cold Vapor Atomic AbsorptionMethod with Zeeman Background CorrectionD7623 Test Method for Total Mercury in Crude Oil UsingCombustion-Gold Amalgamation and Cold Vapor AtomicAbsorption Method2.2 EPA Standa
11、rd:3EPA Method 1669 Sampling Ambient Water for Trace Met-als at EPA Water Quality Criteria Levels;July 1996;USEnvironmental Protection Agency3.Terminology3.1 DefinitionsFor definitions of terms used in thisstandard,refer to Terminology D4175.3.2 Abbreviations:3.2.1 VOAVolatile Organic Analysis4.Summ
12、ary of Practice4.1 This practice describes the sampling,storage,transport,and handling of hydrocarbon samples used for determiningmercury,and the precautions that need to be taken to preventsample contamination and loss of analyte.1This practice is under the jurisdiction of ASTM Committee D02 on Pet
13、roleumProducts,Liquid Fuels,and Lubricants and is the direct responsibility of Subcom-mittee D02.03 on Elemental Analysis.Current edition approved Nov.1,2015.Published November 2015.Originallyapproved in 2008.Last previous edition approved in 2014 as D7482 14.DOI:10.1520/D7482-15.2For referenced AST
14、M 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.3Available from United States Environmental Protection Agency(EPA),ArielRios Bldg.,12
15、00 Pennsylvania Ave.,NW,Washington,DC 20460(www.epa.gov).*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 This practice is intended for use in sampl
16、ing liquidhydrocarbons including crude oils,condensates,refinery pro-cess intermediates,and refined products.Generally thesesamples are expected to contain mercury from the parts perbillion(10-9mass)to parts per million(10-6mass)range.5.2 This practice is not intended for use when samplingaqueous systems where the concentrations of mercury are oftenin the parts per trillion(10-12mass)range.These samples areoften better addressed by using the rigorously clean techniquesfrom the EPA Method 1669“cl
