1、Designation:D519418Standard Test Method forTrace Chloride in Liquid Aromatic Hydrocarbons1This standard is issued under the fixed designation D5194;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
2、 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 totalchloride(organic and inorganic)in liquid aromatic hydrocar-bons and cyclohexane.1.2 The test meth
3、od is applicable to samples with chlorideconcentrations of 1 to 25 mg/kg.1.3 Bromides and iodides,if present,will be calculated aschlorides.1.4 Materials,such as styrene,that are polymerized bysodium biphenyl reagent cannot be analyzed by this testmethod.1.5 In determining the conformance of the tes
4、t results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 This standard does not purport
5、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.For a specific hazard statement,see Sec
6、tion 7.1.8 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 TechnicalBarri
7、ers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D891 Test Methods for Specific Gravity,Apparent,of LiquidIndustrial Chemicals(Withdrawn 2018)3D1193 Specification for Reagent WaterD1555M Test Method for Calculation of Volume and Weightof Industrial Aromatic Hydrocarbons and Cyclo
8、hexaneMetricD3437 Practice for Sampling and Handling Liquid CyclicProductsD3505 Test Method for Density or Relative Density of PureLiquid ChemicalsD4052 Test Method for Density,Relative Density,and APIGravity of Liquids by Digital Density MeterD6809 Guide for Quality Control and Quality AssurancePro
9、cedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Documents:4OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.12003.Summary of Test Method3.1 A known amount of hydrocarbon sample is
10、transferredinto a separatory funnel containing toluene.Sodium biphenylreagent is added to convert organic halogens into inorganichalides.The excess reagent is decomposed with water and thephases are separated.The aqueous phase is acidified,washed,and concentrated.Acetone is added and the solution is
11、 titratedwith silver nitrate solution.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.04 on Instrumental Analysis.Current edition approved Jan.1,2018.Published January 2018.O
12、riginallyapproved in 1991.Last previous edition approved in 2013 as D5194 13.DOI:10.1520/D5194-18.2For 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
13、Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.*A Summary of Changes section
14、 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 Princip
15、les for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 4.Significance and Use4.1 Organic and inorganic chlorine compounds can have adeleterious effect on equipment and reactions in processesinvol
16、ving aromatic hydrocarbons.4.2 Maximum chloride levels are often specified for processstreams and for aromatic hydrocarbon products.5.Apparatus5.1 Titrator,potentiometric,recording,+2000 mV range,1mV resolution with dispenser having a volume readout of 0.00to 9.99 mL or 0.00 to 99.99 mL and 0.01%resolution.5.2 Electrode,glass,reference.5.3 Electrode,silver,billet type.6.Reagents and Materials6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is
