ASTM_D_6143_-_18.pdf

Designation:D614318Standard Test Method forIron Content of Bisphenol A(4,4-Isopropylidenediphenol)1This standard is issued under the fixed designation D6143;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 procedure to determine theiron content of bisphenol A(4,4-isopropylidenediphenol).1.2 This test method has a lower detection limit of 0.1mg/kg,and an upper limit of 10 mg/kg of iron in bisphenol A.If the iron content is higher,it may be necessary to dilute thesample.A longer path length cell can also be used for betteraccuracy at lower Fe levels,as well as calibration within therange expected(for example,0 to 1 mg/kg versus 0 to 10mg/kg for samples expected to be in the 0 to 1 mg/kg range.1.3 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 E29.1.4 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 limits prior to use.For aspecific hazard statement,see Section 9.1.6 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)D4790 Terminology of Aromatic Hydrocarbons and RelatedChemicalsD6809 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 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 See Terminology D4790 for definitions of terms used inthis standard.4.Summary of Test Method4.1 Bisphenol A is dissolved in methanol,then treated withhydroxylamine hydrochloride to convert any ferric iron presentto ferrous iron.The ferrous iron is then complexed with an ironreagent to form a purple/maroon chromophore that is quanti-fied by visible spectrophotometry at 560 nm.5.Significance and Use5.1 Iron may increase the color of bisphenol A and affectother properties of end-use products.5.2 High purity bisphenol A typically has less than 1 mg/kgof iron.6.Interferences6.1 No direct interferences have been observed in the use ofthis method.7.Apparatus7.1 Visible Spectrophotometer,capable of measuring absor-bance at 560 nm.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of D16.02 on Oxygenated Aromatics.Current edition approved June 1,2018.Published June 2018.Originallyapproved in 1997.Last previous edition approved in 2013 as D6143 13.DOI:10.1520/D6143-18.2For 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.1 7.2 Analytical Balance,capable of weighing 100 g to thenearest 0.01 g.7.3 Glassware,100 mL and 1 L volumetric flasks,500 mLgraduated cylinders,10 mL volumetric pipettes,1 cm squarequartz cuvettes.7.4 All Glassware used in this test method should bededicated and thoroughly cleaned prior to use.8.Reagents and Materials8.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the spec