ASTM_D_6728_-_16_2021.pdf

Designation:D672816(Reapproved 2021)Standard Test Method forDetermination of Contaminants in Gas Turbine and DieselEngine Fuel by Rotating Disc Electrode Atomic EmissionSpectrometry1This standard is issued under the fixed designation D6728;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 determination of contami-nants and materials as a result of corrosion in gas turbine ordiesel engine fuels by rotating disc electrode atomic emissionspectroscopy(RDE-AES).1.1.1 The test method is applicable to ASTM Grades 0-GT,1-GT,2-GT,3-GT,and 4-GT gas turbine fuels and Grades LowSulfur No.1-D,Low Sulfur No.2-D,No.1-D,No.2-D,andNo.4-D diesel fuel oils.1.1.1.1 Trace metal limits of fuel entering turbine combus-tor(s)are given as 0.5 mg kg each for vanadium,sodium+potassium,calcium,and lead in Specification D2880 for all GTgrades.1.1.2 This test method provides a rapid at-site determinationof contamination and corrosive elements ranging from frac-tions of mg/kg to hundreds of mg/kg in gas turbine and dieselengine fuels so the fuel quality and level of required treatmentcan be determined.1.1.3 This test method uses oil-soluble metals for calibra-tion and does not purport to quantitatively determine or detectinsoluble particles.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.The preferred units for concentration are mg/kg(ppmby mass).1.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D975 Specification for Diesel FuelD2880 Specification for Gas Turbine Fuel OilsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System Performance3.Terminology3.1 Definitions:3.1.1 burn,vtin emission spectroscopy,to vaporize andexcite a specimen with sufficient energy to generate spectralradiation.3.1.2 calibration,nthe determination of the values of thesignificant parameters by comparison with values indicated bya set of reference standards.3.1.3 calibration curve,nthe graphical or mathematicalrepresentation of a relationship between the assigned(known)values of standards and the measured responses from themeasurement system.3.1.4 calibration standard,na standard having an ac-cepted value(reference value)for use in calibrating a measure-ment instrument or system.3.1.5 detection limit,nthe smallest concentration of anelement that can be measured for specific analysis conditionsand data collection periods.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 July 1,2021.Published August 2021.Originallyapproved in 2001.Last previous edition approved in 2016 as D6728 16.DOI:10.1520/D6728-16R21.2For 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 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.13.1.6 emission spectroscopy,nmeasurement of energyspectrum emitted by or from an object under some form ofenergetic stimulation;for example,light,electrical discharge,and so forth.3.2 Definitions of Terms Specific to This Standard:3.2.1 arc discharge,na self-sustaining,high currentdensity,high temperature discharge uniquely characterized bya cathode fall nearly equal to the ionization potential of the gasor va