ASTM_D_4789_-_12.pdf

Designation:D478912Standard 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.1.Scope*1.1 This test method describes the procedure for determina-tion of the Platinum-Cobalt Color of bisphenol A(4,4-Isopropylidenediphenol)dissolved in methanol.1.2 This test method has been found applicable for thedetermination of Platinum-Cobalt color of bisphenol A be-tween 20 and 100 color units.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 Section 8.2.Referenced Documents2.1 ASTM Standards:2D1209 Test Method for Color of Clear Liquids(Platinum-Cobalt Scale)D4297 Practice for Sampling and Handling Bisphenol A(4,4-Isopropylidinediphenol)D6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)32.2 Other Documents:OSHA Regulations,29 CFRparagraphs 1910.1000 and1910.12004NIST Letter Circular LC 1017,Standard for Checking theCalibration of Spectrophotometers(200 to 1000 nm)53.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 controlor for setting specifications.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 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 275 to 295 mm above the bottom of thetube.6.2 Color Comparator,constructed to permit visual com-parison of light transmitted through tall-form,100 mL Nesslertubes in the direction of their longitudinal axis;and so thatwhite light is passed through or reflected off a white glass plate1This 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 Aug.15,2012.Published August 2012.Originallyapproved in 1988.Last previous edition approved in 2008 as D4789 08.DOI:10.1520/D4789-12.2For 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.3The last approved version of this historical standard is referenced onwww.astm.org.4Available 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.5Available from National Institute of Standards and Technology(NIST),100Bureau Dr.,Stop 1070,Gaithersburg,MD 20899-1070,http:/www.nist.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 and directed with equal intensity through the tubes.It should beshielded so that no light enters the tubes from the sides.6.3 Spectrophotometer,equipped for liquid samples and formeasurements in the visible region.NOTE1The spectrophotometer must be clean and in excellentoperating condition.The instrument should be calibrated in accordancewith the instructions given in NIST Letter Circular LC 1017.For goodagreement with the visual method,the spectrophotometer or colorimetershould be a filter type instrument.6.4 Spectrophotometer Cells,cells of different path lengthsmay be used as long as the equipment is calibrated with thesame length cells as the sample solution.6.5 Filter Paper,glass fiber filter,1.2-m pore retention.7.Reagents7.1 Purity of ReagentsReagent grade chemicals shall beus