1、Designation:D405900(Reapproved 2010)Standard Test Method forAnalysis of Polychlorinated Biphenyls in Insulating Liquidsby Gas Chromatography1This standard is issued under the fixed designation D4059;the number immediately following the designation indicates the year oforiginal adoption or,in the cas
2、e 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.Scope1.1 This test method describes a quantitative determinationof the concentration of polychlorinated bi
3、phenyls(PCBs)inelectrical insulating liquids by gas chromatography.It alsoapplies to the determination of PCB present in mixtures knownas askarels,used as electrical insulating liquids.1.2 The PCB mixtures known as Aroclors2were used in theformulation of the PCB-containing askarels manufactured inth
4、e United States.This test method may be applied to thedetermination of PCBs in insulating liquids contaminated byeither individual Aroclors or mixtures of Aroclors.This tech-nique may not be applicable to the determination of PCBs fromother sources of contamination.1.3 The precision and bias of this
5、 test method have beenestablished only for PCB concentrations in electrical insulatingmineral oils and silicones.The use of this test method has notbeen demonstrated for all insulating fluids.Some insulatingliquids,such as halogenated hydrocarbons,interfere with thedetection of PCBs and cannot be te
6、sted without pretreatment.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 stan
7、dard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:3D923 Practices for Sampling Electrical Insulating Liquids3.Symbols3.1 The following symbols are used in this test method:Cconce
8、ntration of PCB(ppm by weight)in the insulating test specimen.Ciconcentration of PCB(ppm by weight)found for the peak,i,in thechromatogram of the insulating liquid test specimen.ddensity of the test specimen at 25C,g/mL.firelative content of the PCB species associated with each individualpeak,i,in t
9、he chromatogram of the standard Aroclor solution,%.Mtotal amount of PCB in the standard test specimen injected into thechromatograph,g.Miamount of PCB represented by peak,i,in the chromatogram of thestandard Aroclor test specimen,g.Risresponse of the detector to PCB components with relative retentio
10、ntime,i,in the chromatograms of the standard,s,solutions,responsemay be expressed as peak height,peak area,or integrator counts.Rixresponse of the detector to PCB components with relative retentiontime,i,in the chromatogram of an unknown test specimen,may beexpressed as peak height,peak area,or inte
11、grator counts.Rpsresponse of the detector to PCB components in the largest or mostcleanly separated peaks,p,in chromatograms of standard solutions;may be expressed as peak height,peak area,or integrator counts.Rpxresponse of the detector to PCB components in the largest or mostcleanly separated peak
12、s,p,in the chromatogram of an unknown testspecimen contaminated by a single Aroclor;may be expressed inpeak height,peak area,or integrator counts.svolume of the standard test specimen injected into thechromatograph,L.xvolume of the unknown test specimen injected into thechromatograph,L.Voriginal vol
13、ume of the test specimen to be analyzed,L.Vstotal volume of the diluted standard,mL.Vxtotal volume of the test specimen to be analyzed,L.Wxweight of the test specimen to be analyzed,g.Wsweight of the initial standard Aroclor test specimen,g.4.Summary of Test Method4.1 The test specimen is diluted wi
14、th a suitable solvent.Theresulting solution is treated by a procedure to remove interfer-ing substances after which a small portion of the resultingsolution is injected into a gas chromatographic column.Thecomponents are separated as they pass through the column withcarrier gas and their presence in
15、 the effluent is measured by anelectron capture(EC)detector and recorded as a chromato-gram.The test method is made quantitative by comparing thesample chromatogram with a chromatogram of a knownquantity of one or more standard Aroclors,obtained under thesame analytical conditions.5.Significance and
16、 Use5.1 United States governmental regulations mandate thatelectrical apparatus and electrical insulating fluids containing1This test method is under the jurisdiction of Committee D27 onElectricalInsulating Liquids and Gasesand is the direct responsibility of SubcommitteeD27.03 on Analytical Tests.Current edition approved May 15,2010.Published June 2010.Originallypublishedasaproposal.Lastpreviouseditionapprovedin2005asD4059 00(2005)1.DOI:10.1520/D4059-00R10.2Registered trademark of Monsanto Co.3