ASTM_D_7423_-_17.pdf

Designation:D742317Standard Test Method forDetermination of Oxygenates in C2,C3,C4,and C5Hydrocarbon Matrices by Gas Chromatography and FlameIonization Detection1This standard is issued under the fixed designation D7423;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.Scope*1.1 This test method covers the gas chromatographic pro-cedure for the quantitative determination of organic oxygenatesin C2,C3,C4,and C5 matrices by multidimensional gaschromatography and flame ionization detection.This testmethod is applicable when the hydrocarbon matrices have afinal boiling point not greater than 200 C.Oxygenate com-pounds include,but are not limited to,those listed in Table 1.The linear working range for oxygenates is 0.50 mg kg to100 mgkg.1.2 This test method is intended to determine the massconcentration of each oxygenate in the hydrocarbon matrix.Oxygenate compound identification is determined by referencestandards and column elution retention order.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.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 TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specification for Liquefied Petroleum(LP)GasesD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products andLubricantsD6849 Practice for Storage and Use of Liquefied PetroleumGases(LPG)in Sample Cylinders for LPG Test MethodsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE355 Practice for Gas Chromatography Terms and Relation-ships3.Terminology3.1 Additional terminology related to the practice of gaschromatography can be found in Practice E355.3.2 Definitions:3.2.1 liquefied petroleum gas(LPG),na mixture of nor-mally gaseous hydrocarbons,predominantly propane orbutane,or both,that has been liquefied by compression orcooling,or both,to facilitate storage,transport,and handling.D41753.2.2 oxygenate,nan oxygen-containing ashless organiccompound,such as an alcohol or ether,which may be used asa fuel or fuel supplement.D41753.3 Definitions of Terms Specific to This Standard:3.3.1 Deans switching methodrepresentative aliquot ofsample is injected on-column using a sample valve(or via a gas1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.D0.04 on C4 and C5 Hydrocarbons.Current edition approved June 1,2017.Published July 2017.Originally approvedin 2009.Last pervious edition approved in 2016 as D7423 16a.DOI:10.1520/D7423-17.2For 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.*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 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 chromatograph split inlet).The sample passes onto a nonpolarcolumn,which elutes the lighter hydrocarbons in boiling pointorder to the analytical column and backflushes the heavierhydrocarbons to vent.The oxygenate compounds elute fromthe analytical column and are detected via a flame ionizationdetector.3.3.2 Deans switching method direct injectgas chromato-graphic valve configuration equipped with a valve connecteddirectly to the precolumn.This technique is commonly used forthe determination of oxygenates in ethene and propene con-centrates.This configuration provides the lowest de