ASTM_D_7328_-_13.pdf

Designation:D732813Standard Test Method forDetermination of Existent and Potential Inorganic Sulfateand Total Inorganic Chloride in Fuel Ethanol by IonChromatography Using Aqueous Sample Injection1This standard is issued under the fixed designation D7328;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 an ion chromatographic proce-dure for the determination of the existent inorganic andpotential sulfate and total inorganic chloride content in hydrousand anhydrous denatured ethanol to be used in motor fuelapplications.It is intended for the analysis of ethanol samplescontaining between 0.55 and 20 mg/kg of existent inorganicsulfate,4.0 to 20 mg/kg of potential inorganic sulfate,and 0.75to 50 mg/kg of total inorganic chloride.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.Material SafetyData Sheets are available for reagents and materials.Reviewthem for hazards prior to usage.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5827 Test Method for Analysis of Engine Coolant forChloride and Other Anions by Ion ChromatographyD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6792 Practice for Quality System in Petroleum Productsand Lubricants Testing LaboratoriesD7318 Test Method for Existent Inorganic Sulfate in Ethanolby Potentiometric TitrationD7319 Test Method for Determination of Existent and Po-tential Sulfate and Inorganic Chloride in Fuel Ethanol andButanol by Direct Injection Suppressed Ion Chromatog-raphy2.2 Other Standard:ISO/CEN15492Ethanol as a Blending Component forPetrol Determination of Inorganic Chloride IonChromatographic Method33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 existent inorganic sulfate,ninorganic sulfate speciesactually present in the sample at the time of analysis with nooxidation treatment.3.1.2 inorganic chloride,nchloride present as hydrochlo-ric acid,ionic salts of this acid,or mixtures of these.3.1.3 inorganic sulfate,nsulfate species present as sulfu-ric acid,ionic salts of this acid,or mixtures of these.3.1.4 potential sulfate,ntotal inorganic sulfate speciespresent after the sample has been reacted with an oxidizingagent.4.Summary of Test Method4.1 For existent inorganic sulfate and chloride,a smallvolume of a sample is evaporated to dryness and reconstitutedto the initial sample volume with deionized water,and injectedinto an ion chromatograph consisting of appropriate ionexchange columns,suppressor and a conductivity detector.Forpotential sulfate,a small volume of a sample is evaporated todryness and reconstituted to the initial sample volume with1This 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 Sept.15,2013.Published September 2013.Originallyapproved in 2007.Last previous edition approved in 2011 as D7328 11.DOI:10.1520/D7328-13.2For 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 International Organization for Standardization(ISO),1 rue deVaremb,Case postale 56,CH-1211,Geneva 20,Switzerland,http:/www.iso.ch.*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 0.90%hydrogen peroxide solution in water,and injected intoan ion chromatograph.Ions are separated based on their affinityfor exchange sites of the resin with respect to the resins affinityfor the eluent.The suppressor increases the sensitivity of themethod by both increasing the conductivity of the analytes anddecreasing the conductivity of the eluent.The suppressorconverts the eluent and the analytes to the correspondinghydrogen form acids.Anions in the aqueous sample arequantified by integration of their responses compared with anext