1、Designation:D492812(Reapproved 2018)Manual of Petroleum Measurement Standards(MPMS),Chapter 10.9Standard Test Method forWater in Crude Oils by Coulometric Karl Fischer Titration1This standard is issued under the fixed designation D4928;the number immediately following the designation indicates the y
2、ear 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.This standard has been approved for use by agencies of the U.S.Departme
3、nt of Defense.1.Scope1.1 This test method covers the determination of water inthe range from 0.02 to 5.00 mass or volume%in crude oils.Mercaptan(RSH)and sulfide(Sor H2S)as sulfur are knownto interfere with this test method,but at levels of less than500 gg ppm(m),the interference from these compounds
4、 isinsignificant(see Section 6).1.2 This test method can be used to determine water in the0.005 to 0.02 mass%range,but the effects of the mercaptanand sulfide interference at these levels has not been deter-mined.For the range 0.005 to 0.02 mass%,there is noprecision or bias statement.1.3 This test
5、method is intended for use with standardcommercially available coulometric Karl Fischer reagent.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,as
6、sociated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For specific warning statements,see Section 8.1.6 This international standard was dev
7、eloped in accor-dance with internationally recognized principles on 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 Docume
8、nts2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum Products(API MPMS Chapter 8.1)D4177 Practice for Automatic Sampling of Petroleum andPetroleum Products(API MPMS Chapter 8.2)D5854 Practice for Mixing and Handling of Liquid Sample
9、sof Petroleum and Petroleum Products(API MPMS Chap-ter 8.3)E203 Test Method for Water Using Volumetric Karl FischerTitration2.2 API Standards:3MPMS Chapter 8.1 Practice for Manual Sampling of Petro-leum and Petroleum Products(ASTM Practice D4057)MPMS Chapter 8.2 Practice for Automatic Sampling ofPet
10、roleum and Petroleum Products(ASTM PracticeD4177)MPMS Chapter 8.3 Practice for Mixing and Handling ofLiquid Samples of Petroleum and Petroleum Products(ASTM Practice D5854)3.Terminology3.1 The following terms are used with respect to sampling(see Section 9).3.2 Definitions of Terms Specific to This
11、Standard:3.2.1 aliquot,na small portion of a larger sample which isanalyzed and assumed to represent the whole sample.3.2.2 sample,nportion extracted from the contents of anypipe,tank,or other system,and intended to be representative ofthat system,placed in a primary sample container for analysis.1T
12、his test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and the API Committee onPetroleum Measurement,and is the direct responsibility of Subcommittee D02.02/COMQ,the joint ASTM-API Committee on Hydrocarbon Measurement forCustody Transfer(Join
13、t ASTM-API).This test method has been approved by thesponsoring committees and accepted by the Cooperating Societies in accordancewith established procedures.Current edition approved July 1,2018.Published August 2018.Originallyapproved in 1989.Last previous edition approved in 2012 as D4928 12.DOI:1
14、0.1520/D4928-12R18.2For 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.3Published as Manual of Petroleum Standards.Ava
15、ilable from AmericanPetroleum Institute(API),1220 L.St.,NW,Washington,DC 20005-4070,http:/www.api.org.Jointly copyrighted by ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,USA and the American Petroleum Institute(API),1220 L Street NW,Washington DC 20005,USAThis
16、 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 3.2.3 test specimen,nthe representative sample takenfrom the primary or intermediate sample(aliquot)container foranalysis.The entire test specimen is used in the analysis.4.Summary of Test
