1、Designation:D219422Standard Test Method forConcentration of Formaldehyde Solutions1This standard is issued under the fixed designation D2194;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 parent
2、heses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This test method covers the determination of the form-aldehyde content
3、 of commercially available formaldehydesolutions ranging in concentration from 36 to 55 weight%.1.2 For purposes of determining conformance of an ob-served value or a calculated value using this test method torelevant specifications,test result(s)shall be rounded off“tothe nearest unit”in the last r
4、ight-hand digit used in expressingthe specification limit,in accordance with the rounding-offmethod of Practice E29.1.3 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 suppliersMate
5、rial Safety Data Sheet.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,health,and environmental practices and deter-mine the applicability of regulatory limita
6、tions prior to use.1.6 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,Guides and Recom-mendations issued by the World Trade Organization Te
7、chnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D1193 Specification for Reagent WaterE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications3.Summary of Test Method3.1 The specimen is reacted with an excess of sodium sulfite
8、solution and the resulting sodium hydroxide is titrated withsulfuric acid using thymolphthalein indicator.3.2 The sample should be essentially neutral;0.1%acidity(as formic acid)is equivalent to 0.065%formaldehyde.4.Significance and Use4.1 This test method provides a measurement of formalde-hyde con
9、tent(assay)of formaldehyde solutions.The results ofthese measurements can be used for specification acceptance.5.Apparatus5.1 Buret,calibrated,100-mL,with a 50 or 75-mL reservoiron top of a lower portion calibrated in 0.1-mL divisions.ATFE-fluorocarbon resin stopcock is suitable for this purpose.5.2
10、 Erlenmeyer Flask,500-mL capacity.5.3 Vials,specimen,short,style,1 to 112-dram(4 to 6-mL)capacity.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents shall conform to the specifications of the Commit-tee on Anal
11、ytical Reagents of the American Chemical Society,where such specifications are available.3Other 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.6.2 Purity of WaterUnless otherwise i
12、ndicated,referencesto water shall be understood to mean reagent water conformingto Type IV of Specification D1193.1This 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 Solven
13、ts,Plasticizers,and Chemical Intermediates.Current edition approved Jan.1,2022.Published January 2022.Originallyapproved in 1963.Last previous edition approved in 2012 as D2194 02(2012)which was withdrawn January 2021 and reinstated in January 2022.DOI:10.1520/D2194-22.2For referenced ASTM standards
14、,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.3ACS Reagent Chemicals,Specifications and Procedures for Reagents andStandard-Grade Reference Ma
15、terials,American Chemical Society,Washington,DC.For suggestions on the testing of reagents not listed by the American 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.(
16、USPC),Rockville,MD.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 theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.16.3 Sodium Sulfite Solution(125 g L)Dissolve 125 g ofanhyd
