ASTM_D_3988_-_05_2011.pdf

Designation:D398805(Reapproved 2011)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 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 ethylenediaminetetraacetic 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 interfere 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 are to be regarded as thestandard.The values given in parentheses are for informationonly.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 and determine the applica-bility of regulatory limitations prior to use.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Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Practice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The amount of vanadium drier used in oxidizing-typecoatings significantly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 vanadiumavailable 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 the 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 Reagents 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,referenceto water shall be understood to mean reagent water conformingto Type II of Specification D1193.6.3 Ammonium Hydroxide(sp gr 0.90)Concentrated am-monium hydroxide(NH4OH).6.4 Ascorbic Acid.6.5 Buffer SolutionAdd 350 mL of concentrated NH4OHto 54 g of ammonium chloride and dilute to 1 L with water.6.6 Eriochrome Black T IndicatorMix and grind thor-oughly in a mortar a mixture of 0.2 g of Eriochrome Black T1This 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 Paints and Paint Materials.Current edition approved June 1,2011.Published June 2011.Originallyapproved in 1981.Last previous edition approved in 2005 as D3988 05.DOI:10.1520/D3988-05R11.2For 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 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,Washington,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 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and 100 g of sodium chloride.Store the mixture in a tightlystoppered bottle where it is stable indefinitely.6.7 EDTA,Standard Solution(0.01 M)Weigh about 3.73 gof EDTA to the nearest 0.01 g,dissolve in water,and dilute toapproximately 1 L in a glass-stoppered bottle.6.8 Hydrochloric Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).6.9 Isopropyl Alcohol,99.5%.6.10 Zinc Chloride,Standard Solution(ZnCl2)(0.01 M)Weigh about