1、Designation:D211909Standard 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.Scope*1.1 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 uni
4、ts 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 and health practices and determine the applica-bility of regulat
5、ory limitations prior to use.For specific hazardstatements,see Section 8.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterD3437 Practice for Sampling and Handling Liquid CyclicProductsD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarb
6、ons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Documents:OSHARegulations,29CFR paragraphs1910.1000and1910.120033.Summary of Test Method3.1 An alcoholic solution of hydroxylamine hydrochlorideis added to a specimen
7、 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.Significance and Use4.1 This test method is sui
8、table 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,25-mL.6.3 Volumetric Flasks,100-mL.6.4
9、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 to the specifications of the Committe
10、e on1This 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 June 1,2009.Published July 2009.Originally a
11、pprovedin 1962.Last previous edition approved in 2003 as D2119 03.DOI:10.1520/D2119-09.2For 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 pag
12、e onthe ASTM website.3Available from Standardization Documents Order Desk,DODSSP,Bldg.4,SectionD,700RobbinsAve.,Philadelphia,PA19111-5098,http:/www.dodssp.daps.mil.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Con
13、shohocken,PA 19428-2959.United States1 Analytical Reagents of the American Chemical Society wheresuch specifications are available.4Other grades may be used,provided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accuracy ofthe determin
14、ation.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/
15、mL)to 1 L with water.7.4 Hydroxylamine Hydrochloride SolutionDissolve 20 gof hydroxylamine hydrochloride(NH2OHHCl)in 1 L ofmethanol and neutralize to the red-yellow end point of thymolblue indicator.7.5 Methanol.7.6 Sodium Hydroxide,Standard Solution(0.05 N)Dissolve 2.00 g of low-carbonate sodium hy
16、droxide(NaOH)in water and dilute to 1 L.Standardize against primary standardbenzoic acid.7.7 Thymol Blue Indicator Solution Dissolve 0.1 g ofthymol sulfonphthalein,sodium salt,in water and dilute to 100mL.8.Hazards8.1 Consult the latest OSHAregulations,suppliers MaterialSafety Data Sheets,and local regulations regarding all mate-rials used in this test method.8.2 Styrene monomer is flammable and polymerizes exo-thermally on contact with peroxides,mineral acids,and AlCl3.9.Sampling and Handling9.
