ASTM_D_4929_-_19a.pdf

Designation:D492919aStandard Test Method forDetermination of Organic Chloride Content in Crude Oil1This standard is issued under the fixed designation D4929;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 The procedures in this test method cover the determi-nation of organic chloride(above 1 g/g organically-boundchlorine)in crude oils,using either distillation and sodiumbiphenyl reduction,distillation and microcoulometry,or distil-lation and X-ray fluorescence(XRF)spectrometry.1.2 The procedures in this test method involve the distilla-tion of crude oil test specimens to obtain a naphtha fractionprior to chloride determination.The chloride content of thenaphtha fraction of the whole crude oil can thereby beobtained.See Section 5 regarding potential interferences.1.3 Procedure A covers the determination of organic chlo-ride in the washed naphtha fraction of crude oil by sodiumbiphenyl reduction followed by potentiometric titration.1.4 Procedure B covers the determination of organic chlo-ride in the washed naphtha fraction of crude oil by oxidativecombustion followed by microcoulometric titration.1.5 Procedure C covers the determination of organic chlo-ride in the washed naphtha fraction of crude oil by X-rayfluorescence spectrometry.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6.1 The preferred concentration units are micrograms ofchloride per gram of sample,though milligrams of chloride perkilogram of sample is commonly used for Procedure C.1.7 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.1.8 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:2D86 Test Method for Distillation of Petroleum Products andLiquid Fuels at Atmospheric PressureD1193 Specification for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum 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 andLubricantsD6708 Practice for Statistical Assessment and Improvementof Expected Agreement Between Two Test Methods thatPurport to Measure the Same Property of a MaterialD7343 Practice for Optimization,Sample Handling,Calibration,and Validation of X-ray Fluorescence Spec-trometry Methods for Elemental Analysis of PetroleumProducts and Lubricants3.Summary of Test Method3.1 A crude oil distillation is performed to obtain thenaphtha cut at 204 C(400 F).The distillation method wasadapted from Test Method D86 for the distillation of petroleumproducts.The naphtha cut is washed with caustic,repeatedlywhen necessary,until all hydrogen sulfide is removed.Thenaphtha cut,free of hydrogen sulfide,is then washed withwater,repeatedly when necessary,to remove inorganic halides(chlorides).3.2 There are three alternative procedures for determinationof the organic chloride in the washed naphtha fraction,asfollows.1This 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 Dec.1,2019.Published December 2019.Originallyapproved in 1989.Last previous edition approved in 2019 as D4929 19.DOI:10.1520/D4929-19A.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 3.2.1 Procedure A,Sodium Biphenyl Re