1、Designation:E246908aStandard Test Method forChloride in Mono-,Di-and Tri-ethylene Glycol by IonChromatography1This standard is issued under the fixed designation E2469;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、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 determination of inorganicchloride(chloride ion)in monoethylene glycol(MEG),dieth-ylene glycol(DEG)
3、and triethylene glycol(TEG)in the rangeof 0.01 to 1.0 mg/kg by ion chromatography(IC).1.2 Ethylene glycol can be analyzed directly by this testmethod without any sample preparation or diluted with highquality deionized water if an autosampler is used and dilutionis necessary(that is,50:50 or other s
4、uitable ratio).1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3.1 The exception is the additional information of(psi)in9.3.3.1.4 Review the current Material Safety Data Sheets(MSDS)for detailed information concerning toxic
5、ity,first-aid proce-dures and safety precautions.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 and health practices and to determine theapplicability of regu
6、latory limitations prior to use.For specifichazard statements,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 P
7、ractice for Sampling Industrial Chemicals3.Summary of Test Method3.1 An aliquot of the glycol sample is injected directly(manually)or diluted(via autosampler)into an ion chromato-graph consisting of an injector with a fixed sample loop,twoanion exchange columns(guard and separator column),ananion su
8、ppressor and a conductivity detector.Ions are sepa-rated based on their affinity for the ion exchange sites of theresin with respect to the resins affinity for the eluent.Thesuppressor increases the sensitivity of the test method by bothincreasing the conductivity of the analytes and decreasing thec
9、onductivity of the eluent.The suppressor converts the eluentand the analytes to the corresponding hydrogen form acids.The chloride is detected by conductivity detection and identi-fied by retention time.Quantitation is by peak area using anexternal standard calibration curve.Instructions are provide
10、dfor two equivalent IC systems.4.Significance and Use4.1 This test method provides for the quantitative determi-nation of inorganic chloride(chloride ion)in monoethyleneglycol(MEG),diethylene glycol(DEG)and triethylene glycol(TEG)using ion chromatography with conductivity detection.The analysis time
11、 is less than 5 min with little or no samplepreparation required.Conductivity detection is a universaldetection mode and is linear over the range of the method.Acceptable levels of chloride in polyester-grade and low-conductivity-grade MEG vary with the manufacturers speci-fications but are normally
12、 in the low mg/kg range.Knowledgeofthechloridecontentinpolyester-gradeandlow-conductivity-grade MEG is required to establish whether theMEG product meets specification requirements.4.2 Glycols have high viscosities and a dilution with highquality deionized water may be required depending on thecapab
13、ility of the autosampler,if used,to deliver the injection.All standards and samples,whether diluted or not should betreated in the same manner.5.Interferences5.1 The identification of chloride is based on retention time.Interferences can be caused by ionic substances with retention1This test method
14、is under the jurisdiction of ASTM Committee E15 onIndustrial and Specialty Chemicals and is the direct responsibility of SubcommitteeE15.02 on Product Standards.Current edition approved Dec.15,2008.Published January 2009.Originallyapproved in 2006.Last previous edition approved in 2008 as E2469 08.D
15、OI:10.1520/E2469-08A.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.3The last approved version of this historical
16、 standard is referenced onwww.astm.org.*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 States1 times similar to that of chloride.If the eluent conditions arechanged or the column capacity changes,it is possible thatother anions may coelute with chloride and cause an interfer-ence.5.2 Any anion that elutes after chloride under the analysisconditions used in the test method may ca
