ASTM_D_6667_-_14.pdf

Designation:D666714Standard Test Method forDetermination of Total Volatile Sulfur in GaseousHydrocarbons and Liquefied Petroleum Gases by UltravioletFluorescence1This standard is issued under the fixed designation D6667;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 determination of totalvolatile sulfur in gaseous hydrocarbons and liquefied petro-leum(LP)gases.It is applicable to analysis of natural,processed,and final product materials.Precision has beendetermined for sulfur in gaseous hydrocarbons in the range of1 mg/kg to 100 mg/kg and for sulfur in LP gases in the rangeof 1 mg/kg to 196 mg/kg(Note 1).NOTE1An estimate of pooled limit of quantification(PLOQ),information regarding sample stability and other general informationderived from the interlaboratory studies on precision can be referenced inthe ASTM research reports.2,31.2 This test method may not detect sulfur compounds thatdo not vaporize under the conditions of the test.1.3 This test method is applicable for total volatile sulfurdetermination in LP gases containing less than 0.35%(mass/mass)halogen(s).1.4 The values stated in SI units are to be regarded asstandard.1.5 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.See 3.1 andSections 6 and 7 for specific warning statements.2.Referenced Documents2.1 ASTM Standards:4D1070 Test Methods for Relative Density of Gaseous FuelsD1265 Practice for Sampling Liquefied Petroleum(LP)Gases,Manual MethodD3700 Practice for Obtaining LPG Samples Using a Float-ing Piston CylinderD5287 Practice for Automatic Sampling of Gaseous FuelsD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceF307 Practice for Sampling Pressurized Gas for Gas Analy-sis2.2 Gas Processor Association(GPA)Standards:5GPA 2166 Obtaining Natural Gas Samples for Analysis byGas ChromatographyGPA 2174 Obtaining Liquid Hydrocarbon Samples forAnalysis by Gas Chromatography3.Summary of Test Method3.1 Aheated sample valve is used to inject gaseous samples.Liquefied petroleum gas(LPG)samples are injected by asample valve connected to a heated expansion chamber.Thegaseous sample then enters a high temperature combustiontube where sulfur is oxidized to sulfur dioxide(SO2)in anoxygen rich atmosphere.Water produced during the samplecombustion is removed and the sample combustion gases arenext exposed to ultraviolet(UV)light.The SO2absorbs theenergy from the UV light and is converted to an excited sulfurdioxide(SO2).Fluorescence emitted from the excited SO2*asit returns to a stable state SO2*is detected by a photomultiplier1This 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 Oct.1,2014.Published October 2014.Originallyapproved in 2001.Last previous edition approved in 2010 as D6667 10.DOI:10.1520/D6667-14.2Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1506.ContactASTM CustomerService at serviceastm.org.3Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D02-1784.ContactASTM CustomerService at serviceastm.org.4For 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.5Available from Gas Processors Association(GPA),6526 E.60th St.,Tulsa,OK74145.*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 States1 tube,the resulting signal is a measure of the sulfur contained inthe sample.(WarningExposure to excessive quantities ofultraviolet light is injurious to health.The operator shall avoidexposing their person,especially their eyes,not only to directUV light but also to secondary or scattered radiation that ispresent.)4.Significance and Use4.1 The sulfur content of LPG,used for fuel purposes,contributes to SOx emissions and can lead to corrosion inengine and exhaust systems.Some process catalysts used inpetroleum and chemical refining can be poisoned by sulfurbearing materials in the feed stocks.This test method can beused to determine sulfur in process feeds,to measure sulfur infinish