1、Designation:D208722Standard Test Method forIron in Formaldehyde Solutions1This standard is issued under the fixed designation D2087;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 ind
2、icates 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 the totaliron content of formaldehyde solutions.1.2 For purposes of determining conformance of an ob-served or a calcul
3、ated 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 E29.1.3 The values stated in SI units are to be regarded asst
4、andard.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 with its use.It is theresponsibility of the user of this sta
5、ndard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations 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
6、 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 Standards:2D1193 Specification for Reagent WaterE29 Practice for Using Significant Digits in Test Data
7、toDetermine Conformance with Specifications3.Summary of Test Method3.1 The specimen is evaporated and ashed;the iron,reducedto the divalent state by the addition of hydroxylaminehydrochloride,is reacted with o-phenanthroline to develop acolor that is measured at 510 nm.4.Significance and Use4.1 This
8、 test method provides a measurement of iron con-tent of formaldehyde solutions.The results of these measure-ments can be used for specification acceptance.5.Apparatus5.1 Spectrophotometer,capable of measuring light absorp-tion at 510 nm.5.2 Absorption Cells,minimum light path,10 mm.5.3 Evaporating D
9、ishes,90 mm diameter,high-silica glass.6.Reagents and Materials6.1 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 Analytical Reagents of the American Chemical Soci
10、ety,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 indicated,referencesto water shall be understo
11、od to mean reagent water as definedby Type IV of Specification D1193.6.3 Ammonium Acetate Solution(100 g L)Dissolve 100 gof ammonium acetate(NH4C2H3O2)in 100 mL of water.Add200 mL of acetic acid(CH3COOH),dilute to 1 L with water,and mix.6.4 Ammonium Hydroxide(1+1)Mix equal volumes ofconcentrated amm
12、onium hydroxide(NH4OH,sp gr 0.90)andwater.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 Solvents,Plasticizers,and Chemical Intermediates.Current edition approved Jan.
13、1,2022.Published January 2022.Originallyapproved in 1962.Last previous edition approved in 2012 as D2087 06(2012)which was withdrawn January 2021 and reinstated in January 2022.DOI:10.1520/D2087-22.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at
14、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 Materials,American Chemical Society,Washington,DC.For suggestions on the t
15、esting 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.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO
16、 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.16.5 Congo Red Paper.6.6 Hydrochloric Acid(1+1)Mix equal volumes of con-centrated hydrochloric acid(HCl,sp gr 1.19)and water.6.7 Hy
