ASTM_D_1686_-_10.pdf

Designation:D168610Standard Test Method forColor of Solid Aromatic Hydrocarbons and Related Materialsin the Molten State(Platinum-Cobalt Scale)1This standard is issued under the fixed designation D1686;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 visual measurement of thecolor of thermally stable solids melting below 150C.It isapplicable only to materials in which the color-producingbodies present have light absorption characteristics quite simi-lar to those of the standards used.1.2 In determining the conformance of the test results usingthis method to applicable specifications,results shall berounded off in accordance with the rounding-off method ofPractice E29.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 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.For specific hazardstatements see Sections 7 and 9.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3438 Practice for Sampling and Handling Naphthalene,Maleic Anhydride,and Phthalic AnhydrideD3852 Practice for Sampling and Handling Phenol,Cresols,and Cresylic AcidD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Significance and Use3.1 Color by this test method is a measure of color-producing impurities present in the thermally stable solids.This test method is suitable for setting specifications and foruse as an internal quality control tool.4.Apparatus4.1 Color Comparison TubesMatched 100-mL,tall-formNessler tubes,provided with ground-on,optically clear,glasscaps.Tubes should be selected so that the height of the 100-mLgraduation mark is 300 6 3 mm above the bottom of the tube.The use of heat-resistant tubes is preferred for safety reasons.4.2 Color ComparatorA color comparator constructed topermit visual comparison of light transmitted through tall-form,100-mL Nessler tubes in the direction of their longitu-dinal axes.The comparator should be constructed so that whitelight is reflected off a white plate and directed with equalintensity through the tubes,and should be shielded so that nolight enters the tubes from the side.4.3 OvenAn oven,preferably of the forced draft type andcapable of maintaining a constant temperature 61C in therange up to 150C.Alternatively,the use of an aluminumheating block provided with proper temperature control orother similar equipment is permissible.5.Reagents5.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.02 on Oxygenated Aromatics.Current edition approved Jan.1,2010.Published January 2010.Originallyapproved in 1959.Last previous edition approved in 2004 as D1686 96(2004).DOI:10.1520/D1686-10.2For 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.3Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.*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 where such specifications are available.4Other grades may beused,provided it is first ascertained that the reagent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean Type IV reagent waterconforming to Specification D1193.5.3 Cobalt Chloride(CoCl26H2O).5.4 Hydrochloric Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).5.5 Potassium Chloroplatinate(K2PtCl6).6.Standards6.1 Platinum-Cobalt Stock Solution Dissolve 1.245 g ofK2PtCl6and 1.000 g of CoCl26H2O in water.Add 100 mL ofHCl and dilute to 1 L with water.This solution has a color of500.56.2