1、Designation:D398805(Reapproved 2017)Standard Test Method forVanadium in Paint Driers by EDTA Method1This standard is issued under the fixed designation D3988;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses 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 titrimetric determination ofvanadium in liquid vanadium driers and utilizes the disodiumsalt of ethylenediamin
3、etetraacetic acid dihydrate(EDTA).1.2 This test method is limited to the determination of thevanadium content of a liquid vanadium drier that does notcontain other drier elements.This test method is not applicableto drier blends.1.3 All cations that can be titrated with EDTA in alkalinemedia interfe
4、re and must not be present in the sample.1.4 This test method has been tested for concentrations of 3and 4%vanadium,but there is no reason to believe that it isnot suitable for higher or lower vanadium concentrationsprovided specimen size is adjusted proportionately.1.5 The values stated in SI units
5、 are to be regarded asstandard.No other units of measurement are included in thisstandard.1.6 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
6、and determine the applica-bility of regulatory limitations prior to use.1.7 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
7、-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D600 Specification for Liquid Paint DriersD1193 Specification for Reagent WaterE180 Practice for Determining the Precision of ASTMMethods for Analysis and Testing of
8、Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Practice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The amount of vanadium drier used in oxidizing-typecoatings significantly affects their drying properties.The vana-dium drier is acidified and heated to make the vanadiumava
9、ilable for chelation with EDTA.It is then chelated,the pHadjusted,and the excess titrated with zinc chloride solution,using Eriochrome Black T as the indicator.4.Significance and Use4.1 This test method may be used to confirm the statedcontent of a pure liquid vanadium drier manufactured for useby t
10、he coatings industry.5.Apparatus5.1 Centrifuge,capable of developing 1000 to 2000 g.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 Analytical Reagent
11、s of the American Chemical Society,where such specifications are available.4Other 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,refer
12、enceto water shall be understood to mean reagent water conformingto Type II 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 D01.21 on Chemical Analysis of
13、Paints and Paint Materials.Current edition approved July 1,2017.Published July 2017.Originally approvedin 1981.Last previous edition approved in 2011 as D3988 05(2011).DOI:10.1520/D3988-05R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servic
14、eastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washi
15、ngton,DC.For suggestions on the testing of reagents notlisted by the American Chemical Society,see Analar Standards for LaboratoryChemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeiaand National Formulary,U.S.Pharmacopeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM Internat
16、ional,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.1 6.3 Ammonium Hydroxide(sp gr 0.90)Concentrated am-monium hydroxide(NH4OH).6.4 Ascorbic Acid.6.5 Buf
