1、Designation:D808620Standard Test Method forDetermination of Methanol and Ethanol in ElectricalInsulating Liquids of Petroleum Origin by Headspace(HS)-Gas Chromatography(GC)Using Mass Spectrometry(MS)or Flame Ionization Detection(FID)1This standard is issued under the fixed designation D8086;the numb
2、er 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.Scope1.1 This
3、 test method describes the determination of by-products of cellulosic materials degradation found in electricalinsulation systems that are immersed in insulating liquid.Suchmaterials include paper,pressboard,wood and cotton materi-als.This test method allows the analysis of methanol andethanol from
4、the sample matrix by headspace GC-MS orGC-FID.1.2 This test method has been used to test for methanol andethanol in mineral insulating liquids and less flammableelectrical insulating liquids of mineral origin as defined inD3487 and D5222 respectively.Currently,this method is not apractical applicati
5、on for ester liquids.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 concerns,if any,associated with its use.It is theresponsibility of the user of this standard
6、to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Princ
7、iples 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:2D923 Practices for Sampling Electrical Insulating LiquidsD3487 Specification for Mineral Insulatin
8、g Oil Used inElectrical ApparatusD3612 Test Method for Analysis of Gases Dissolved inElectrical Insulating Oil by Gas ChromatographyD5222 Specification for High Fire-Point Mineral ElectricalInsulating OilsD5837 Test Method for Furanic Compounds in ElectricalInsulating Liquids by High-Performance Liq
9、uid Chroma-tography(HPLC)3.Terminology3.1 Definitions:3.1.1 extract ion mass spectrum,na record that shows aspecific mass-to-charge ratio(m/z)extracted from a massspectrum.3.1.2 mass spectrum,na record that shows the relativenumber of ions of various mass that are produced when a givensubstance is p
10、rocessed in a mass spectrometer.4.Summary of Test Method4.1 Analysis of methanol(CH3OH)and ethanol(C2H5OH)in electrical insulating liquids consists of bringing an insulatingliquid sample in contact with a gas phase(headspace)in aclosed vessel.The dissolved species contained in the insulatingliquid a
11、re then equilibrated between the two phases in contactunder controlled conditions(according to Henrys law).Atequilibrium,the headspace is over-pressurized with a carriergas and then the content of a loop is filled by the depressur-ization of the headspace against the ambient atmosphericpressure(see
12、Note 1).NOTE1Other headspace principles may also be used but need to beverified and the analytical performance may be somewhat different thanlisted.4.2 The gases contained in the loop or in the syringe areintroduced into a gas chromatograph.4.3 Methanol and ethanol in the test specimen are quantifie
13、dusing calibration curves.1This test method is under the jurisdiction of ASTM Committee D27 onElectrical Insulating Liquids and Gases and is the direct responsibility of Subcom-mittee D27.03 on Analytical Tests.Current edition approved Dec.1,2020.Published February 2021.DOI:10.1520/D8086-20.2For ref
14、erenced 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Consho
15、hocken,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 Organiz
16、ation Technical Barriers to Trade(TBT)Committee.15.Significance and Use5.1 Methanol and ethanol are generated by the degradationof cellulosic materials used in the solid insulation systems ofelectrical equipment.More particularly,methanol comes fromthe depolymerization of cellulosic materials.3,4,5,65.2 Methanol and ethanol,which are soluble in an insulatingliquid to an appreciable degree,will proportionally migrate tothat liquid after being produced from the cellulose.5.3 High concentrations or
