ASTM_D_7923_-_19.pdf

Designation:D792319Standard Test Method forWater in Ethanol and Hydrocarbon Blends by Karl FischerTitration1This standard is issued under the fixed designation D7923;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 water inblends of ethanol,hydrocarbon,and corresponding blends.It isintended for measuring water content of gasoline or otherhydrocarbon blendstock,denatured fuel ethanol as cited inSpecification D4806,and ethanol fuel blends such as thosecited in Specification D5798 and Practice D7794.This testmethod is not applicable to samples that are phase separated.1.1.1 Procedure AFor measurement of water from0.004%by mass to 1.63%by mass in ethanol and hydrocar-bon using coulometric Karl Fischer titration.This is the refereemethod for samples containing up to 1.63%water.1.1.2 Procedure BFor measurement of water from 0.02%by mass to 5.41%by mass in ethanol and hydrocarbon usingvolumetric Karl Fischer titration.1.2 This method measures mass percent water and allowsfor the alternative reporting of volume percent.This testmethod recommends the use of pyridine-free reagents.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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific precautionary statements are given in Section 8.1.5 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:2D1152 Specification for Methanol(Methyl Alcohol)D1193 Specification for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4806 Specification for Denatured Fuel Ethanol for Blend-ing with Gasolines for Use as Automotive Spark-IgnitionEngine FuelD5798 Specification for Ethanol Fuel Blends for Flexible-Fuel Automotive Spark-Ignition EnginesD6299 Practice for Applying Statistical Quality Assuranceand Control Charting Techniques to Evaluate AnalyticalMeasurement System PerformanceD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a MaterialD7794 Practice for Blending Mid-Level Ethanol FuelBlends for Flexible-Fuel Vehicles withAutomotive Spark-Ignition EnginesE203 Test Method for Water Using Volumetric Karl FischerTitrationE1064 Test Method for Water in Organic Liquids by Coulo-metric Karl Fischer Titration3.Terminology3.1 For general terminology,refer to Terminology D4175.3.2 Definitions:3.2.1 denatured fuel ethanol,nfuel ethanol made unfit forbeverage use by the addition of denaturants under formula(s)approved by the applicable regulatory agency to prevent theimposition of beverage alcohol tax.D48061This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.06 on Analysis of Liquid Fuels and Lubricants.Current edition approved June 1,2019.Published June 2019.Originallyapproved in 2016.Last previous edition approved in 2017 as D7923 17a1.DOI:10.1520/D7923-19.2For 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 3.2.2 hydrocarbon,na compound composed solely ofhydrogen and carbon.D57983.2.2.1 DiscussionThe hydrocarbon mixtures used inethanol fuel blends will be unleaded gasoline,gasoline blend-stock for oxygenate blending(BOB),natural gasoline,or otherhydrocarbons in the gasoline boiling range.The