ASTM_D_6258_-_09_2014.pdf

Designation:D625809(Reapproved 2014)Standard Test Method forDetermination of Solvent Red 164 Dye Concentration inDiesel Fuels1This standard is issued under the fixed designation D6258;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 for determiningthe concentration of dye Solvent Red 164 in commerciallyavailable diesel and burner fuels using visible spectroscopy.NOTE1This test method is suitable for all No.1 and No.2 grades inSpecifications D396 and D975 and for grades DMA and DMB inSpecification D2069.1.2 The concentration ranges specified for the calibrationstandards are established in response to the Internal RevenueService dyeing requirements which state that tax-exempt dieselfuel satisfies the dyeing requirement only if it contains the dyeSolvent Red 164(and no other dye)at a concentrationspectrally equivalent to 3.9 lb of the solid dye standard SolventRed 26 per thousand bbl(11.1 mg/L)of diesel fuel.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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Standards:2D396 Specification for Fuel OilsD975 Specification for Diesel Fuel OilsD2069 Specification for Marine Fuels(Withdrawn 2003)3D3699 Specification for KerosineD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE131 Terminology Relating to Molecular SpectroscopyE169 Practices for General Techniques of Ultraviolet-VisibleQuantitative AnalysisE275 Practice for Describing and Measuring Performance ofUltraviolet and Visible SpectrophotometersE288 Specification for Laboratory Glass Volumetric FlasksE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE969 Specification for Glass Volumetric(Transfer)Pipets2.2 Federal Regulation:26 CFR 48.4082-1(b)Federal Excise Tax Regulation3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology E131.4.Summary of Test Method4.1 The absorbance of each sample is recorded over aspecified wavelength range,and the scan is analyzed usingderivative analysis software to determine the dye concentra-tion.4.2 Derivative analysis methodology is employed to mini-mize interferences caused by variations in the color andcomposition of the fuel samples regularly tested using this testmethod.4.2.1 Naturally occurring diesel test fuels range in colorfrom water white to nearly black,and many of the samplestested using this test method have also had used oils and otherproducts blended with them.These variations in color andcomposition have a significant effect upon absorbance charac-teristics of the samples in the region of the visible spectrumwhere azo dyes absorb.Standard operating procedures tocorrect for these background variations would involve runninga neat(undyed)sample and subtracting out the backgroundabsorbance.In most situations involved with the application ofthis test method,however,neat material is not available,so nobackground corrections can be made.4.2.2 The second derivative of the absorbance of these dyesin the visible region is a function of the fine structure of thedyes absorbance peak(versus its height or area)and isrelatively unaffected by changes in background absorbance.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.05 on Properties of Fuels,Petroleum Coke and Carbon Material.Current edition approved May 1,2014.Published July 2014.Originally approvedin 1998.Last previous edition approved in 2009 as D6258 09.DOI:10.1520/D6258-09R14.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Further,the specific sections(maxima and minima)of thesecond derivative spectra employed for this analysis are afunction of the fine structure of the top of the absorbance curvewhich has been found to be unique to the azo dyes.5.Significance and Use5.1 This test method was developed to provide for theenforcement of 26 CFR 48.4082-1(b),which mandates that alltax-exempt diesel fuels