ASTM_D_7828_-_12.pdf

Designation:D782812Standard Test Method forDetermination of Residue Composition in LiquefiedPetroleum Gas(LPG)Using Automated Thermal Desorption/Gas Chromatography(ATD/GC)1This standard is issued under the fixed designation D7828;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 residue inLPG by automated thermal desorption/gas chromatography(ATD/GC)using flame ionization detection(FID).1.2 The quantitation of residue covers a component boilingpoint range from 69C to 522C,equivalent to the boilingpoints of C6through C40n-paraffins.1.2.1 The boiling range covers possible LPG contaminantssuch as gasoline,diesel fuel,phthalates and compressor oil.Qualitative information on the nature of the residue can beobtained from this test method.1.2.2 Materials insoluble in LPG and components which donot elute from the gas chromatograph or which have noresponse in a flame ionization detector are not determined.1.2.3 The reporting limit(or limit of quantitation)for totalresidue is 6.7 g/g.1.2.4 The dynamic range of residue quantitation is 6.7 to3300 g/g.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:2D1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD1835 Specification for Liquefied Petroleum(LP)GasesD2158 Test Method for Residues in Liquefied Petroleum(LP)GasesD3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceE355 Practice for Gas Chromatography Terms and Relation-ships2.2 Environmental Protection Agency:3EPAMethod TO-17 Determination of Volatile Organic Com-pounds in Ambient Air using Active Sampling ontoSorbent Tubes3.Terminology3.1 Definitions:3.1.1 For the definitions of common chromatographic terms,refer to Practice E355.3.1.2 quality control sample,QC sample,nfor use inquality assurance program to determine and monitor theprecision and stability of a measurement system;a stable andhomogenous material having physical or chemical properties,or both,similar to those of typical samples tested by theanalytical measurement system.The material is properly storedto ensure sample integrity,and is available in sufficient quantityfor repeated long-term testing.D62993.2 Definitions of Terms Specific to This Standard:3.2.1 residue,nsoluble contaminants in LPG with boilingpoints from 69C to 522C,covering the boiling point range ofC6to C40n-paraffins.3.2.2 sorbent tube,na tube that contains commerciallyavailable adsorbents whose composition is specific to retain thecomponents of interest(residues).3.2.3 thermal desorber,na sample introduction techniqueused in gas chromatography in which residue adsorbed on anadsorbent material is desorbed into a gas chromatograph.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.H0 on Liquefied Petroleum Gas.Current edition approved Nov.1,2012.Published March 2013.DOI:10.1520/D7828-12.2For 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.3Available from United States Environmental Protection Agency(EPA),ArielRios Bldg.,1200 Pennsylvania Ave.,NW,Washington,DC 20460,http:/www.epa.gov.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.3.1 DiscussionFigs.1-3 illustrate the flow path andfunction of the thermal desorber used in this test method.3.2.4 thermal desorption,nthe process of using heat,temperature,gas flow and time to remove adsorbed compo-nents captured in a sorbent tube for introduction into a gaschromatograph for analysis.3.2.5 time group,nin gas chromatography,a set timewindow used in determining the response(area).3.2.5.1 DiscussionIn this test method,the time for re-sponse begins after the elution of pentane and stops after theelution of C40or of the heavier oil being used for this range,with the sum of the integrated peaks within this time providinga total area of the residue.3.3 Acronyms:3.3.1 ATDautomated thermal desorption3.3.2 ISinternal standard3.3.3 LPGliquefie