ASTM_D_5845_-_01_2011.pdf

Designation:D584501(Reapproved 2011)Standard Test Method forDetermination of MTBE,ETBE,TAME,DIPE,Methanol,Ethanol and tert-Butanol in Gasoline by InfraredSpectroscopy1This standard is issued under the fixed designation D5845;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 methanol,ethanol,tert-butanol,methyl tert-butyl ether(MTBE),ethyltert-butyl ether(ETBE),tert-amyl methyl ether(TAME),anddiisopropyl ether(DIPE)in gasoline by infrared spectroscopy.The test method is suitable for determining methanol from 0.1to 6 mass%,ethanol from 0.1 to 11 mass%,tert-butanol from0.1 to 14 mass%,and DIPE,MTBE,ETBE and TAME from0.1 to 20 mass%.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D1298 Test Method for Density,Relative Density(SpecificGravity),or API Gravity of Crude Petroleum and LiquidPetroleum Products by Hydrometer MethodD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4307 Practice for Preparation of Liquid Blends for Use asAnalytical StandardsD4815 Test Method for Determination of MTBE,ETBE,TAME,DIPE,tertiary-Amyl Alcohol and C1to C4Alco-hols in Gasoline by Gas ChromatographyD5599 Test Method for Determination of Oxygenates inGasoline by Gas Chromatography and Oxygen SelectiveFlame Ionization DetectionE1655 Practices for Infrared Multivariate QuantitativeAnalysis2.2 Other Standard:3GC/OFID EPA Test MethodOxygen and Oxygenate Con-tent Analysis(by way of gas chromatography withoxygen-selective flame ionization detection)3.Terminology3.1 Definitions:3.1.1 multivariate calibration,na process for creating acalibration model in which multivariate mathematics is appliedto correlate the absorbances measured for a set of calibrationsamples to reference component concentrations or propertyvalues for the set of samples.The resultant multivariatecalibration model is applied to the analysis of spectra ofunknown samples to provide an estimate of the componentconcentration or property values for the unknown sample.3.1.2 oxygenate,nan oxygen-containing organic com-pound,which may be used as a fuel or fuel supplement,forexample,various alcohols or ethers.4.Summary of Test Method4.1 A sample of gasoline is introduced into a liquid samplecell.A beam of infrared light is imaged through the sampleonto a detector,and the detector response is determined.Regions of the infrared spectrum are selected for use in theanalysis by either placing highly selective bandpass filtersbefore or after the sample or mathematically selecting theregions after the whole spectrum is obtained.A multivariatemathematical analysis is carried out which converts the detec-tor response for the selected regions in the spectrum of anunknown to a concentration for each component.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.04.0F on Absorption Spectroscopic Methods.Current edition approved Oct.1,2011.Published November 2011.Originallyapproved in 1995.Last previous edition approved in 2006 as D584501(2006).DOI:10.1520/D5845-01R11.2For 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.3Code of Federal Regulations,Part 80 of Title 40,Section 80.46(g);alsopublished in the Federal Register,Volume 59,No.32,February 16,1994,p 7828.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.Significance and Use5.1 Alcohols and ethers are added to gasoline to produce areformulated lower emissions gasoline.Alcohols and ethersmay also be added to gasoline to increase the octane number.Type and concentration of various oxygenates are specified andregulated to ensure acceptable commercial gasoline quality.Driveability,vapor pressure,phase separation,and evaporativeemissions are some of the concerns associated with oxygenatedfuels.5.2 This test method is faster,simpler,less expensive andmore portable than current methods.5.3 This test method may be applicable for quality control inthe production of gasoline.5.4 This test method is not suit