1、Designation:D238419Standard Test Methods forTraces of Volatile Chlorides in Butane-Butene Mixtures1This standard is issued under the fixed designation D2384;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、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 These test methods cover the determination of the totalvolatile organic chlorides in concentrations from 10 mg kg to100 mgkg in butane-but
3、ene mixtures.The amperometric fin-ish is not directly applicable in the presence of other substancesthat combine with silver ion or oxidize chloride ion in diluteacid solution.Bromides,sulfides,ammonia,tobacco smoke,and more than 25 g of hydrogen peroxide in the test solutioninterfere in the spectro
4、photometric procedure.1.2 Dissolved sodium chloride is not quantitatively deter-mined using these test methods.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 con
5、cerns,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 warning statements are given in Sections 5,8,11,14,19,and Ann
6、ex A1.1.5 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 TechnicalBarrie
7、rs to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D329 Specification for AcetoneD1266 Test Method for Sulfur in Petroleum Products(LampMethod)3.Summary of Test Methods3.1 Combination Test MethodsEither the lamp or oxy-hydrogen test method may be used for combustion.NOTE1Lamp combus
8、tion is readily applicable to multiple testing.Although an oxy-hydrogen burner does not lend itself to multiple testing,it affords much more rapid analysis for a single sample than does the lampcombustion.3.1.1 Lamp CombustionThe sample is burned in an atmo-sphere of carbon dioxide and oxygen or in
9、purified air;thehalogen-containing combustion products are absorbed in dilutesodium carbonate solution.3.1.2 Oxy-Hydrogen CombustionThe sample is burned inan oxy-hydrogen atomizer burner,and the combustion productsare absorbed in a dilute solution of sodium carbonate.3.2 FinishesEither the amperomet
10、ric titration or spectro-photometric finish may be used for the chloride ion determi-nation.3.2.1 Amperometric TitrationThe chloride ion in aqueoussolution is titrated amperometrically with standard silver ni-trate solution,using a saturated calomel electrode as referenceelectrode.The diffusion curr
11、ents are plotted against the corre-sponding volumes of silver nitrate solution used;the end pointis taken as the intersection of the two straight-line portions ofthe curve.3.2.2 Spectrophotometric FinishChloride ion in the ab-sorber solution is determined by reaction with mercuric thio-cyanate to re
12、lease thiocyanate,which forms a reddish orangecomplex with Fe+.The intensity of the color is measured at460 nm with a spectrophotometer or filter photometer.4.Significance and Use4.1 These test methods are used to determine trace amountsof volatile chlorides in butane-butene mixtures.Such informa-ti
13、on is valuable in cases where chloride is deleterious in the useof this product;also,chloride contributes to corrosion prob-lems in processing units in instances where further processingof this material is involved.5.Purity of Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all
14、 tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,1These test methods are under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and ar
15、e the direct responsibilityof Subcommittee D02.D0.04 on C4 and C5 Hydrocarbons.Current edition approved Dec.1,2019.Published January 2020.Originallyapproved in 1965.Last previous edition approved in 2014 as D2384 83(2014).DOI:10.1520/D2384-19.2For referenced ASTM standards,visit the ASTM website,www
16、.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 P
