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Designation: D1093 − 11 (Reapproved 2017)Standard Test Method forAcidity of Hydrocarbon Liquids and Their DistillationResidues 1This standard is issued under the f i xed designation D1093; the number 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.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope1.1 This test method covers the qualitative determination ofthe acidity of hydrocarbon liquids and their distillation resi-dues. (Warning—Many hydrocarbon liquids are extremelyf l ammable. Harmful if inhaled. Hydrocarbon liquid vapors cancause a f l ash f i re.)1.2 If desired to determine the basicity of a hydrocarbonliquid, proceed in accordance with 9.2 or 9.3, but substitute 3drops of phenolphthalein indicator solution for the methylorange indicator. A pink or red color in the aqueous solutionwhen phenolphthalein is used indicates basicity.1.3 The results obtained by this test method are qualitativeexpressions. However, for the preparation of reagents and inthe procedure, acceptable SI units are to be regarded as thestandard.1.4 This standard does not purport to address all of thesafety problems, if any, 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 use.1.5 This international standard was developed 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 Documents2.1 ASTM Standards: 2D86 Test Method for Distillation of Petroleum Products andLiquid Fuels at Atmospheric PressureD91 Test Method for Precipitation Number of LubricatingOilsD850 Test Method for Distillation of Industrial AromaticHydrocarbons and Related MaterialsD1078 Test Method for Distillation Range of Volatile Or-ganic LiquidsD1193 Specif i cation for Reagent WaterD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4177 Practice for Automatic Sampling of Petroleum andPetroleum Products3. Terminology3.1 Def i nitions:3.1.1 acidity, n—the quality, state or degree of being acid.3.1.1.1 Discussion—In this test method, the criterion foracidity is a pink or red color when methyl orange indicator isused.3.1.2 basicity, n—the quality, state or degree of being basic.3.1.2.1 Discussion—In this test method, the criterion forbasicity is a pink or red color when phenolphthalein indicatoris used.3.1.3 distillation residue, n—that portion of the sampleremaining after distillation using specif i ed procedures.4. Summary of Test Method4.1 The sample of distillation residue or hydrocarbon liquidis shaken with water and the aqueous layer tested for acidity tomethyl orange indicator.4.2 The aqueous layer can also be tested for basicity usingphenolphthalein indicator.5. Signif i cance and Use5.1 Some petroleum products are treated with mineral acidas part of the ref i ning procedure. Obviously, any residualmineral acid in a petroleum product is undesirable. Theabsence of a positive indication in the test for acidity of thedistillation residue or aqueous extract of a hydrocarbon liquidis an assurance of the care used in ref i ning the fuel or solvent.1 This test method is under the jurisdiction 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 May 1, 2017. Published June 2017. Originallyapproved in 1950. Last previous edition approved in 2011 as D1093 – 11. DOI:10.1520/D1093-11R17.2 For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at service@astm.org. For Annual Book of ASTMStandards volume information, refer to the standard’s Document Summary page onthe ASTM website.Copyright © 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 Copyright by ASTM Int'l (all rights reserved); Sat Sep 30 12:08:17 EDT 2017Downloaded/printed byUniversity of Edinburgh (University of Edinburgh) pursuant to License Agreement. No further reproductions authorized.