ASTM_D_4789_-_20e1.pdf

Designation:D4789201Standard Test Method forSolution Color of Bisphenol A(4,4-Isopropylidenediphenol)1This standard is issued under the fixed designation D4789;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.1NOTEResearch report information in Section 12 was updated editorially in February 2021.1.Scope*1.1 This test method covers the procedure for determinationofthePlatinum-CobaltColorofbisphenol A(4,4-Isopropylidenediphenol)dissolved in methanol.1.2 This test method has been found applicable for thedetermination of solution color of bisphenol A to 20 PtCocolor units.1.3 The following applies for the purposes of determiningthe conformance of the test results using this test method toapplicable specifications,results shall be rounded off in accor-dance with the rounding-off method 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.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 specific hazard statements,see Section 8.1.6 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 issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4297 Practice for Sampling and Handling BisphenolA(4,4-Isopropylidinediphenol)D6809 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 SpecificationsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Documents:OSHA Regulations,29 CFRparagraphs 1910.1000 and1910.120033.Summary of Test Method3.1 Bisphenol A is dissolved in methanol.This solution isthen transferred to a color comparison tube and the colorcompared to that of the Platinum-Cobalt Color Standards,either visually or by means of a spectrophotometer.The coloris reported as that closest to the applicable standard.4.Significance and Use4.1 Color is caused by impurities in the bisphenol A.Theacceptable amount of color depends on the end-use of thebisphenol A.4.2 This test method can be used for internal quality control.This method provides the information required to set specifi-cations.5.Interferences5.1 The presence of any turbidity or haze will affect thecolor reading.5.2 AbisphenolAcolor that is off-hue,or tinted with respectto the color standards,may interfere with proper color com-parison.6.Apparatus6.1 Color Comparison TubesMatched Nessler tubes with50 mL or 100 mL graduation marks,or both,provided withground-on,optically clear,glass caps.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 Oct.1,2020.Published December 2020.Originallyapproved in 1988.Last previous edition approved in 2012 as D4789 12.DOI:10.1520/D4789-20E01.2For 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 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.16.2 Tube Racks,constructed to keep the tubes upright and topermit visual comparison of light transmitted through Nesslertubes in the direction of their longitudinal axis;and so thatwhite light is passed through or reflected off a white glass plateand directed with equal intensity through the tubes.6.3 Filter Paper,glass fiber filter,1.2-m pore retention.7.Reagents7.1 Purity of ReagentsReagent grade chemicals shall beused in all