1、Designation:D219122Standard Test Method forAcetaldehyde Content of Vinyl Acetate1This standard is issued under the fixed designation D2191;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 parenthe
2、ses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method covers the determination of tracequantities of acetaldehyde,in the range from 0.00 to 0.05%,contained in 99%grade vinyl acetate.1.2 For purp
3、oses of determining conformance of an ob-served or a calculated value using this test method to relevantspecifications,test result(s)shall be rounded off“to the nearestunit”in the last right-hand digit used in expressing thespecification limit,in accordance with the rounding-off methodof Practice E2
4、9.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 For hazard information and guidance,see the suppliersMaterial Safety Data Sheet.1.5 This standard does not purport to address all of thesafety concerns,if any,associated w
5、ith 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 a
6、ccor-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
7、 Standards:2D1193 Specification for Reagent WaterE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Summary of Test Method3.1 The acetaldehyde present in the specimen is reactedwith a measured excess of sodium bisulfite.The amount ofsodium bisulfite c
8、onsumed,determined by titrating the excesswith a standard iodine solution,is a measure of the acetalde-hyde present in the vinyl acetate.4.Significance and Use4.1 This test method provides a measurement of acetalde-hyde content in vinyl acetate.The results of these measure-ments can be used for spec
9、ification acceptance.5.Interference5.1 Ketones and other aldehydes,if present,cause a positiveinterference.6.Apparatus6.1 Buret,50-mLcapacity,graduatedin0.1-mLsubdivisions,with a funnel or flared top and a ground-glassstopcock.6.2 Erlenmeyer Flask,500-mL capacity,glass-stoppered.6.3 Pipet,50-mL capa
10、city.6.4 Pipet,100-mL capacity.7.Reagents7.1 Purity of ReagentsUnless otherwise indicated,it isintended that all reagents shall conform to the specifications ofthe Committee onAnalytical Reagents of theAmerican Chemi-cal Society,where such specifications are available.3Othergrades may be used provid
11、ed that it is first ascertained that thereagent is of sufficiently high purity to permit its use withoutlessening the accuracy of the determination.7.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type IV of Specification D1193.1
12、This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.35 on Solvents,Plasticizers,and Chemical Intermediates.Current edition approved Jan.1,2022.Published January 2022.Originallyapp
13、roved in 1963.Last previous edition approved in 2012 as D2191 06(2012)which was withdrawn January 2021 and reinstated in January 2022.DOI:10.1520/D2191-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStan
14、dards volume information,refer to the standards Document Summary page onthe ASTM website.3ACS Reagent Chemicals,Specifications and Procedures for Reagents andStandard-Grade Reference Materials,American Chemical Society,Washington,DC.For suggestions on the testing of reagents not listed by the Americ
15、an ChemicalSociety,see Analar Standards for Laboratory Chemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeia and National Formulary,U.S.Pharma-copeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.U
16、nited 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.17.3 Iodine,Standard Solution(0.1 N)Dissolve 35.0 g ofpotassium iodide(KI)and 13.0 g of resublimed iodine in water,and dilute to 1 L with water.Store this solution in a dark