ASTM_D_6143_-_13.pdf

Designation:D614313Standard 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 and health practices and determine the applica-bility of regulatory limits prior to use.For a specific hazardstatement,see Section 9.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD4297 Practice for Sampling and Handling Bisphenol A(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 withFerroZine to form a purple/maroon chromophore that isquantified 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.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.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofD16.02 on Oxygenated Aromatics.Current edition approved June 1,2013.Published June 2013.Originallyapproved in 1997.Last previous edition approved in 2009 as D6143 09.DOI:10.1520/D6143-13.2For 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 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 specification of the Committeeon Analytical Reagents of the American Chemical Society,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.8.2 Methanol,ACS reagent grade,99.8%purity.8.3 Sodium Acetate,pH 5.5.8.3.1 This solution may be prepared by dissolving 272.0 g6 0.1g of reagent grade sodium acetate in 1000 mL distilledwater and adjusting to pH 5.5 with concentrated hydrochloricacid.8.4 Purity of Water,Unless otherwise indicated,referencesto water shall be understood to mean any reagent conformingto