1、Designation:D505914(Reapproved 2019)Standard Test Methods forLead in Gasoline by X-Ray Spectroscopy1This standard is issued under the fixed designation D5059;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover the determination of the tot
3、allead content of a gasoline within the following concentrationranges:0.010 g Pb US gal to 5.0 g Pb US gal0.012 g Pb UK gal to 6.0 g Pb UK gal0.0026 g Pb L to 1.32 g Pb L1.1.1 TestMethods A andBcovertherangeof0.10 g PbUS gal to 5.0 g Pb US gal.Test Method C covers therange of 0.010 g PbUS gal to 0.5
4、0 g Pb US gal.1.1.2 These test methods compensate for normal variationin gasoline composition and are independent of lead alkyl type.1.2 Test Method A(formerly in withdrawn Test MethodD2599)Sections 5 9.Test Method B(formerly in withdrawn Test MethodD2599)Sections 10 14.Test Method C(formerly in wit
5、hdrawn Test MethodD3229)Sections 15 19.1.3 The values stated in SI are to be regarded as thestandard.For reporting purposes the values stated in grams perU.S.gallon are the preferred units in the United States.Notethat in other countries,other units can be preferred.1.4 This standard does not purpor
6、t 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific hazard statements,see Se
7、ctions 5,6,11,and 18.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization
8、TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3341 Test Method for Lead in GasolineIodine Mono-chloride MethodD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techn
9、iques to Evaluate AnalyticalMeasurement System PerformanceD6792 Practice for Quality Management Systems in Petro-leum Products,Liquid Fuels,and Lubricants TestingLaboratories3.Summary of Test Method3.1 There are three alternative test methods,as follows.3.1.1 Test Method A(Bismuth Internal Standard
10、MethodHigh Concentration)One volume of sample is mixed thor-oughly with an equal volume of bismuth internal standardsolution.The mixture is placed in the X-ray beam and theintensities of the lead L-1radiation at 1.175 and the bismuthL-1radiation at 1.144 are determined.The lead concentra-tion of the
11、 sample is measured by comparing the ratio of grosscounting rate at 1.175 with the gross counting rate at 1.144 to a previous prepared calibration curve of concentrationversus the same ratios.3.1.2 Test Method B(Scattered Tungsten RadiationMethod)The ratio of the net X-ray intensity of the lead L-1r
12、adiation to the net intensity of the incoherently scatteredtungsten L-1radiation is obtained on a portion of the sample.The lead content is determined by multiplying this ratio by acalibration factor obtained with a standard lead solution ofknown concentration.3.1.3 Test Method C(Bismuth Internal St
13、andard Method,Low Concentration)Twenty millilitres of sample is mixedthoroughly with two millilitres of bismuth internal standardsolution.The mixture is placed in the X-ray beam of aspectrometer and the intensities of the lead L-1radiation at1These test methods are under the jurisdiction of Committe
14、e D02 on PetroleumProducts,Liquid Fuels,and Lubricants and are the direct responsibility ofSubcommittee D02.03 on Elemental Analysis.Current edition approved May 1,2019.Published June 2019.Originallyapproved in 1990.Last previous edition approved in 2014 as D5059 14.DOI:10.1520/D5059-14R19.Initially
15、 published as D2599 67T and D3229 73,now withdrawn.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
16、International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 1.175,the bismuth L-1radiation at 1.144,and a back-ground at 1.194 are determined.A blank,m
