ASTM_D_6304_-_20.pdf

Designation:D630420Standard Test Method forDetermination of Water in Petroleum Products,LubricatingOils,and Additives by Coulometric Karl Fischer Titration1This standard is issued under the fixed designation D6304;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the direct determination ofentrained water in petroleum products and hydrocarbons usingautomated instrumentation.This test method also covers theindirect analysis of water thermally removed from samples andswept with dry inert gas into the Karl Fischer titration cell.Mercaptan,sulfide(Sor H2S),sulfur,and other compoundsare known to interfere with this test method(see Section 6).The precision statement of this method covers the nominalrange of 20 mgkg to 25 000 mg/kg for ProcedureA,30 mg kgto 2100 mgkg for Procedure B,and 20 mg kg to 360 mg kgfor Procedure C.1.2 This test method is intended for use with commerciallyavailable coulometric Karl Fischer reagents and for the deter-mination of water in additives,lube oils,base oils,automatictransmission fluids,hydrocarbon solvents,and other petroleumproducts.By proper choice of the sample size,this test methodmay be used for the determination of water from mg/kg topercent level concentrations.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.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:2D1193 Specification for Reagent WaterD1298 Test Method for Density,Relative Density,or APIGravity of Crude Petroleum and Liquid Petroleum Prod-ucts by Hydrometer MethodD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD5854 Practice for Mixing and Handling of Liquid Samplesof Petroleum and Petroleum ProductsD6299 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,Liquid Fuels,and LubricantsE203 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 D4175.4.Summary of Test Method4.1 This method uses Karl Fischer titration to determine theamount of water in a sample.A coulometric apparatus is usedto generate iodine for the Karl Fischer reaction at the anode.When all the water has been titrated,excess iodine is detectedby an electrometric end point detector and the titration is1This 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 Dec.1,2020.Published January 2021.Originallyapproved in 1998.Last previous edition approved in 2016 as D6304 161.DOI:10.1520/D6304-20.2For 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.1terminated.Based on the stoichiometry of the reaction,1 moleof iodine reacts with 1 mole of water;thus,the quantity ofwater is proportional to the total inte