ASTM_D_7359_-_18.pdf

Designation:D735918Standard Test Method forTotal Fluorine,Chlorine and Sulfur in AromaticHydrocarbons and Their Mixtures by OxidativePyrohydrolytic Combustion followed by IonChromatography Detection(Combustion IonChromatography-CIC)1This standard is issued under the fixed designation D7359;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 individual determination oftotal fluorine,chlorine and sulfur in aromatic hydrocarbons andtheir mixtures.Samples containing 0.10 to 10 mg/kg of eachelement can be analyzed.1.2 This method can be applied to sample concentrationsoutside the range of the scope by dilution of the sample in anappropriate solvent to bring the total concentrations of fluorine,chlorine and sulfur within the range covered by the testmethod.However,it is the responsibility of the analyst toverify the solubility of the sample in the solvent and that thediluted sample results conform to the precision and accuracy ofthe method.1.2.1 Special considerations must be made in order to attaindetection limits below 1.0 mg/kg in a sample.The instrumentmust be clean and properly maintained to address potentialsources of contamination,or carryover,or both.Multiplesequential injections shall be completed until a stable back-ground is attained.A stable background is considered to beachieved when the analysis of a minimum of three consecutivesystem blanks have area counts equal to or less than 5%RSDfor the anions of interest.1.3 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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.See Section 9.1.6 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 WaterD3437 Practice for Sampling and Handling Liquid CyclicProductsD3505 Test Method for Density or Relative Density of PureLiquid ChemicalsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE177 Practice for Use of the Terms Precision and Bias inASTM Test MethodsE288 Specification for Laboratory Glass Volumetric FlasksE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE969 Specification for Glass Volumetric(Transfer)Pipets1This 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 Nov.1,2018.Published December 2018.Originallyapproved in 2008.Last previous edition approved in 2014 as D7359 14a.DOI:10.1520/D7359-18.2For 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 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 2.2 Other Documents:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 Definitions:3.1.1 combustion ion chromatography,nan analytical sys-tem consisting of pyrohydrolytic combustion followed by ionchromatographic detection.3.1.2 oxidative pyrohydrolytic combustion,na process inwhich a sample undergoes combustion at temperatures greaterthan 900C in an oxygen rich environment and in the presenceof excess water vapor not originating from the combustion ofthe sample.In oxidative pyrohydrolytic combustion,thesample is pyr