1、Designation:D812621Standard Test Method forEfficient Basicity Determination by PotentiometricHydrochloric Acid Titration1This standard is issued under the fixed designation D8126;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar 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 a procedure for the determina-tion of the efficient basicity(EBas)in new marine cylinderlubr
3、icants that lubricate the upper part,that is,piston-ring-cylinder area,of two-stroke marine engines.1.2 This test method has been developed for marine cylinderlubricants,having base number(BN)(measured by TestMethod D2896)from 20 mg KOH/g to 100 mg KOHg,and anEBas from 10 mg KOH/g to 36 mg KOH/g.1.3
4、 In this test method,only the efficient basicity isdetermined,corresponding to the components or part of com-ponents that have a major role in neutralization of the acidicspecies formed in the combustion of the fuel in the marineengine.It differentiates between the fastest reacting species andthe la
5、st one to react like overbasing compounds in detergent(classically mineral calcium carbonate,CaCO3).The valuesobtained,however,are intended to be compared with the othervalues obtained by this test method only;base numbersobtained by this test method are not intended to be equal tovalues by other te
6、st methods.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 standard to establi
7、sh appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Some specific hazards statements are given in Sections 6 and 7.1.6 This international standard was developed in accor-dance with internationally recognized principles on
8、standard-ization established in the Decision on Principles 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:2D1193 Specification for Reagent WaterD2896 Te
9、st Method for Base Number of Petroleum Productsby Potentiometric Perchloric Acid TitrationD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum ProductsD4739 Test Method for Base Number Determination byPotentiometric Hydr
10、ochloric Acid TitrationD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and Lubricants3.Terminology3.1 Definitions:3.1.1 base number,nthe quantity of a specified acid,expressed in terms of the equivalent number of milligrams ofpot
11、assium hydroxide per gram of sample,required to titrate asample in a specified solvent to a specified endpoint using aspecified detection system.3.1.2 effcient basicity,EBas,nthe quantity of hydrochlo-ric acid,expressed in terms of the equivalent number ofmilligrams of potassium hydroxide per gram o
12、f sample,re-quired to neutralize the basic components,which are organicspecies,of the tested lubricant in a specified solvent to aspecified buffer endpoint using a specified detection system.4.Summary of Test Method4.1 The sample is dissolved in a mixture of toluene,propan-2-ol(isopropyl alcohol),ch
13、loroform,and a smallamount of water and titrated potentiometrically with alcoholichydrochloric acid solution.The test results of this procedureare obtained by titration mode of fixed increment and fixedtime additions of the titrant.An endpoint is selected from a1This test method is under the jurisdi
14、ction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.06 on Analysis of Liquid Fuels and Lubricants.Current edition approved Nov.1,2021.Published November 2021.Originallyapproved in 2017.Last previous edition approved in 2017
15、 as D8126 17.DOI:10.1520/D8126-21.2For 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.*A Summary of Changes section ap
16、pears 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 Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1?titration curve according to the criteria g
