ASTM_D_2232_-_14.pdf

Designation:D223214Standard Test Method forEvaporating Residue of Naphthalene1This standard is issued under the fixed designation D2232;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 determination of the evapo-ration residue of naphthalene.1.2 This test method has been found applicable to determin-ing residue in the range of 0.3 and 1.5 wt%.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 limitations prior to use.For specific hazardstatements,see Section 7 and 8.1.2.Referenced Documents2.1 ASTM Standards:2D3438 Practice for Sampling and Handling Naphthalene,Maleic Anhydride,and Phthalic AnhydrideD4790 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 SpecificationsE145 Specification for Gravity-Convection and Forced-Ventilation OvensE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Document:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Terminology3.1 See Terminology D4790 for the definition of terms usedin this test method.4.Summary of Test Method4.1 A weighed quantity of naphthalene is heated in a tareddish for 3 h at 105C in a forced-draft oven and the residue isweighed.5.Significance and Use5.1 Evaporation residue is an empirical measure of nonvola-tile impurities in naphthalene.This test method is suitable forsetting specifications and for use as an internal quality controltool.6.Apparatus6.1 Evaporating Dishes,porcelain,shallow form or alumi-num weighing dishes,low form,fluted,60 mm diameter,15mm high,42 mL capacity.6.2 Drying Oven,forced-ventilation,conforming to Speci-fication E145 Type II,Grade A or B.7.Hazards7.1 Consult current OSHA regulations,suppliers SafetyData Sheets and local regulations for all materials used in thistest method.8.Sampling and Handling8.1 Refer to Practice D3438 for proper sampling and han-dling of this product analyzed by this test method.(CautionSampling should follow safe rules in order to adhere to allsafety precautions as outlined in the latest OSHA regulations.)1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.07 on Styrene,Ethylbenzene and C9 and C10 AromaticHydrocarbons.Current edition approved July 1,2014.Published August 2014.Originallyapproved in 1967.Last previous edition approved in 1990 as D2232 81(1990)which was withdrawnApril 1995 and reinstated in July 2014.DOI:10.1520/D2232-14.2For 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 9.Procedure9.1 Place the evaporating dish in the drying oven and heat at105 6 5C for at least 30 min.Remove from the oven and coolin a desiccator.Weigh the cooled dish to the nearest 0.001 g.9.2 Transfer to the tared dish 9.5 to 10.5 g weighed to thenearest 0.001 g of the thoroughly mixed naphthalene specimen.(CautionSpecimens for this determination should behandled in the solid state.)9.3 Place the dish and contents in the forced draft oven.Maintain at 105 6 5C for 180 6 5 min.(CautionSpecimens should be placed as near the center of the oven aspossible(both horizontally and vertically).The oven shouldnot contain other volatile materials during this determination,nor should it contain objects large enough to change the flowpattern of the circulating air.The draft control on the ovenshould be fully open.)9.4 Remove the dish from the oven,cool in a desiccator,andweigh to the nearest 0.001 g.10.Calculation10.1 Calculate the evaporation residue content of thespecimen,