1、Designation:D582709(Reapproved 2015)Standard Test Method forAnalysis of Engine Coolant for Chloride and Other Anionsby Ion Chromatography1This standard is issued under the fixed designation D5827;the number immediately following the designation indicates the year oforiginal adoption or,in the case o
2、f 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 chemical analysis of enginecoolant for chloride ion by high-performance
3、 ion chromatog-raphy(HPIC).Several other common anions found in enginecoolant can be determined in one chromatographic analysis bythis test method.1.2 This test method is applicable to both new and usedengine coolant.1.3 Coelution of other ions may cause interferences for anyof the listed anions.In
4、the case of unfamiliar formulations,identification verification should be performed by either orboth fortification and dilution of the sample matrix with theanions of interest.1.4 Analysis can be performed directly by this test methodwithout pretreatment,other than dilution,as required by thelinear
5、ranges of the equipment.Table 1 indicates severalapplicable anions and approximate detection limits.1.5 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 This standard does not purport to address all of thesafety concerns,if an
6、y,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to its use.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1176 Practi
7、ce for Sampling and Preparing Aqueous Solu-tions of Engine Coolants orAntirusts for Testing PurposesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test MethodE177 Practice for Use of the Terms Precision and Bias inASTM Test Methods3.Summary of Test Method3.1 A s
8、mall volume of working sample is prepared bydilution of the sample with the method eluant.This dilutedsample is filtered and pumped through two ion exchangecolumns and a suppressor and into a conductivity detector.Ionsare separated based on their affinity for exchange sites of theresin with respect
9、to the resins affinity for the eluant.Thesuppressor increases the sensitivity of the method by bothincreasing the conductivity of the analytes and decreasing theconductivity of the eluant.The suppressor converts the eluantand the analytes to the corresponding hydrogen form acids.Anions are quantitat
10、ed by integration of their response com-pared with an external calibration curve and are reported asmilligrams per litre(mg/L).4.Significance and Use4.1 This test method provides for the qualitative and quan-titative determination of common anions in engine coolant inthe milligrams per litre to low
11、percent range and requires onlya few millilitres or microlitres of sample per test,with resultsavailable in less than 30 min.Acceptable levels of chloride andother anions vary with manufacturers blending specificationsand applicable ASTM minimum or maximum specifications.5.Interferences5.1 Interfere
12、nces can be caused by substances with similarretention times,especially if they are in high concentrationcompared to those of the analyte of interest.Sample dilutionwill be used to minimize or solve most interference problems.5.2 A water dip(solvent system peak)can cause interfer-ence with some inte
13、grators.This is eliminated by dilution withthe eluant if the sample dilution factor is 49+1(v/v)or greater.Below this dilution,it is best to add a spike of eluantconcentrate to the sample such that the sample is not dilutedsignificantly and the resulting test solution matches the eluantused in the s
14、ystem.One method is the addition of 100 L of100X eluant concentrate to 10.0 mL of sample or standard.1This test method is under the jurisdiction of ASTM Committee D15 on EngineCoolants and Related Fluids and is the direct responsibility of SubcommitteeD15.04 on Chemical Properties.Current edition ap
15、proved May 1,2015.Published June 2015.Originallyapproved in 1995.Last previous edition approved in 2009 as D5827-091.DOI:10.1520/D5827-09R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume i
16、nformation,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 States1 5.3 Method interferences can be caused by the contamina-tion of glassware,eluant,reagents,etc.Great care must betaken to ensure that contamination,especially by chloride,iskept at the lowest possible levels.5.4 Pre-rinsing of the sample preparation c