1、Designation:D808718Standard Test Method forColor of Maleic Anhydride in the Molten State and AfterHeating(Platinum-Cobalt Scale)Using TristimulusColorimetry1This standard is issued under the fixed designation D8087;the number immediately following the designation indicates the year oforiginal adopti
2、on 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 test method covers an instrumental method for theCIE(Commission Internationa
3、l de lEclairage)tristimulusmeasurement of the color of maleic anhydride melt before andafter prolonged heating under specified conditions of time andtemperature.The measurement is converted to color values inthe platinum-cobalt system.1.2 This test method covers the range 0 to100 Pt-Co color.1.3 In
4、determining the conformance of the test results usingthis method to applicable specification,results shall be roundedin accordance with the rounding off methods of Practice E29.1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.
5、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 establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.For
6、specific hazard statements,see Sections 7,10.3,and 10.6.1.6 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 issu
7、ed by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD1209 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)D1686 Test Method for Color of Solid Aromatic Hydrocar-bons and Related Materi
8、als in the Molten State(Platinum-Cobalt Scale)D3438 Practice for Sampling and Handling Naphthalene,Maleic Anhydride,and Phthalic AnhydrideD5386 Test Method for Color of Liquids Using TristimulusColorimetryD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and R
9、elated Ma-terialsD8005 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE179 Guide for Selection of Geometric Conditions forMeasurement of Reflection and Transmission Propertiesof MaterialsE
10、308 Practice for Computing the Colors of Objects by Usingthe CIE SystemE313 Practice for Calculating Yellowness and WhitenessIndices from Instrumentally Measured Color CoordinatesE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:3OSHA
11、regulations,29 CFR paragraphs 1910.1000 and1910.12003.Summary of Test Method3.1 A specimen is melted at 60C.3.2 Color is measured by tristimulus values of light trans-mitted by a freshly melted specimen as percent of lighttransmitted by distilled water.Convert the measured tristimu-lus values by app
12、ropriate equations to the platinum-cobaltscale.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.02 on Oxygenated Aromatics.Current edition approved Feb.1,2018.Published June 2
13、018.DOI:10.1520/D8087-182For 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.3Available from U.S.Government Printing Of
14、fice,Superintendent ofDocuments,732 N.Capitol St.,NW,Washington,DC 20401-0001,http:/www.access.gpo.gov.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 p
15、rinciples 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 3.3 After heating for 2 h at 140C,the color of the specimenis again measu
16、red by tristimulus values.Then convert themeasured tristimulus values by appropriate equations to theplatinum-cobalt scale.4.Significance and Use4.1 The color of maleic anhydride can be an indication ofthe purity of these materials.A high color after heatingnormally indicates contamination or decomposition.4.2 This standard is suitable for process quality control anddetermining if the product meets specifications.5.Apparatus5.1 Instrument,with the following provision:5.1.1 Instrument Sensor,shal
