ASTM_D_6045_-_12.pdf

Designation:D604512Standard Test Method forColor of Petroleum Products by the Automatic TristimulusMethod1This standard is issued under the fixed designation D6045;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.1.Scope*1.1 This test method covers the automatic determination ofcolor of a wide variety of petroleum products such as undyedmotor and aviation gasoline,aviation turbine fuels,naphthas,kerosine,pharmaceutical white oils,diesel fuel oils,heatingoils,and lubricating oils by the automatic tristimulus method.This test method correlates to Test Method D156 and TestMethod D1500 as calculated by the instrumentation.NOTE1With the appropriate sample handling,this test method wouldapply to petroleum waxes,but they were not used in the round robin,andthe precision of this test method with regard to waxes is unknown.1.2 This test method reports results in terms of Test MethodD156 or Test Method D1500.1.3 This test method has a one-to-one correlation for theentire range of Test Method D1500 ASTM Color and for therange from 0 to+30 for Test Method D156 Saybolt color.1.4 This test method does not apply to solid samples,petroleum products containing dye,and petroleum productshaving extreme fluorescence.1.5 This test method does not apply to cloudy samples.Suchsamples shall be filtered so they are clear before measuring.1.6 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.7 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D156 Test Method for Saybolt Color of Petroleum Products(Saybolt Chromometer Method)D1500 Test Method for ASTM Color of Petroleum Products(ASTM Color Scale)D2500 Test Method for Cloud Point of Petroleum ProductsD4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsE284 Terminology of AppearanceE308 Practice for Computing the Colors of Objects by Usingthe CIE System2.2 Energy Institute Standard:IP 17 Determination of ColourLovibond Tintometer33.Terminology3.1 Definitions:3.1.1 ASTM color,nthe name of an empirical scale ofexpressing the color of a petroleum liquid darker than Sayboltcolor based on a scale of 0.5(lightest)to 8.0 Dil(darkest)anddetermined by Test Method D1500.3.1.2 CIEthe abbreviation for the French title of theInternational Commission on Illumination,or CommissionInternationale de lEclairage.E2843.1.3 CIEStandardIlluminantC,nColorimetricilluminant,representing daylight with a correlated color tem-perature of 6774 K,defined by the CIE in terms of a relativespectral power distribution.E2843.1.4 CIE 1931 standard observer,nideal colorimetricobserver with color matching functions x(),y(),z()corre-sponding to a field of view subtending a 2 angle on the retina;commonly called the“2 Standard Observer.”E2841This practice is under the jurisdiction of ASTM Committee D02 on PetroleumProducts and Lubricants and is the direct responsibility of Subcommittee D02.05 onProperties of Fuels,Petroleum Coke and Carbon Material.Current edition approved Dec.1,2012.Published February 2013.Originallyapproved in 1996.Last previous edition approved in 2009 as D604509.DOI:10.1520/D6045-12.2For 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.3Methods for Analysis Testing,available from Energy Institute,61 NewCavendish St.,London,WIG 7AR,U.K.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.5 Saybolt color,nthe name of an empirical scale forexpressing of the color of a clear petroleum liquid based on ascale of 16(darkest)to+30(lightest)and determined by TestMethod D156.3.1.6 tristimulus values,nThe amounts of three specifiedstimuli required to match a color.3.1.6.1 DiscussionIn the CIE system,they are assignedthe symbols X,Y,and Z.E2844.Summary of Test Method4.1 The sample is poured into the glass sample container,and the container is placed into the light path of the automaticinstrument.Atransmittance measurement is performed in orderto determine the CIE tristimulus values(under CIE StandardIlluminant C and the CIE 1931 Standard Observer)of thesample in question.These are then converted instrumentally bythe appropriate algorithm to Saybolt color or ASTM colorvalues.4.2 The color of the sample is reported in either Te