1、Designation:D211919Standard Test Method forAldehydes in Styrene Monomer1This standard is issued under the fixed designation D2119;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 indic
2、ates 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 wet chemical determinationof aldehydes in styrene monomer.Aldehydes are calculatedand reported as benzaldehyde.The range of concentration
3、forthis test method is 0.001%to 0.030%.1.2 In determining conformance of the test results using thismethod to applicable specifications,results shall be rounded offin accordance with the rounding-off method of Practice E29.1.3 The values stated in SI units are to be regarded asstandard.No other unit
4、s 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,health,and environmental practices and deter-mine the applicabili
5、ty of regulatory limitations prior to use.For specific hazard statements,see Section 8.1.5 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,G
6、uides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3437 Practice for Sampling and Handling Liquid CyclicProductsD6809 Guide for Quality Control and Quality Assuranc
7、eProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Documents:OSHA Regulations,29 CFR paragraphs 1910.1000 and1910.120033.Summary of Test Method3.1 An alcoholic solution of hydroxylami
8、ne hydrochlorideis added to a specimen of styrene monomer.Active aldehydespresent react in accordance with the following equation:RCHO1NH2OHHClRCHNOH1H2O1HClThe hydrochloric acid,which is equivalent to the aldehydepresent in the sample,is titrated with standard sodium hydrox-ide solution.4.Significa
9、nce and Use4.1 This test method is suitable for determining the quantityof aldehydes,both for quality control and quality assurance ofthe product.5.Interferences5.1 Ketones,if present,interfere by partially reacting withthe reagent.6.Apparatus6.1 Erlenmeyer Flasks,glass-stoppered,250-mL.6.2 Pipets,2
10、5-mL.6.3 Volumetric Flasks,100-mL.6.4 Burets,10-mL.(Microburets are preferred.)6.5 Thermometers,capable of differentiating 1C at ambi-ent.7.Reagents and Materials7.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents conform
11、 to the specifications of the Committee onAnalytical Reagents of the American Chemical Society where1This test method is under the jurisdiction of ASTM Committee D16 onAromatic,Industrial,Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.07 on Styrene,Ethylbenzene
12、 and C9 and C10AromaticHydrocarbons.Current edition approved June 1,2019.Published June 2019.Originallyapproved in 1962.Last previous edition approved in 2009 as D2119 09 which waswithdrawn January 2018 and reinstated in June 2019.DOI:10.1520/D2119-19.2For referenced ASTM standards,visit the ASTM we
13、bsite,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 Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-50
14、98,http:/www.dodssp.daps.mil.Copyright 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
15、 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 such specifications are available.4Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to perm
16、it its use without lessening the accuracy ofthe determination.7.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water as definedby Type III of Specification D1193.7.3 Hydrochloric Acid,Standard(0.05 N)Prepare a 0.05 Nsolution of hydrochloric acid(HCl)by diluting 4.15 mL ofconcentrated HCl(density 1.19 g/mL)to 1 L with water.7.4 Hydroxylamine Hydrochloride SolutionDissolve 20 gof hydroxylamine hydrochloride(NH2OHHCl)in 1 L ofmethanol and neutrali
