ASTM_D_3970_-_05_2011.pdf

Designation:D397005(Reapproved 2011)Standard Test Method forCerium in Paint Driers by Oxidimetric Determination1This standard is issued under the fixed designation D3970;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 ofcerium in liquid cerium and rare earth paint driers and utilizesferrous ammonium sulfate.1.2 This test method is not applicable to dryer blends.1.3 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.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 regulatory limitations prior to use.For a specifichazard statement,see Section 7.2.Referenced Documents2.1 ASTM Standards:2D444 Test Methods for Chemical Analysis of Zinc YellowPigment(Zinc Chromate Yellow)D600 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Practice for Determining the Precision of ASTMMethods for Analysis and Testing of Industrial and Spe-cialty Chemicals(Withdrawn 2009)3E300 Practice for Sampling Industrial Chemicals3.Summary of Test Method3.1 The organic constituents of the liquid drier specimen areeliminated by treatment with nitric,sulfuric,and hydrochloricacids,and the cerium is converted to cerous sulfate.The ceroussulfate is oxidized to ceric sulfate with sodium bismuthate andtitrated with standard ferrous ammonium sulfate.4.Significance and Use4.1 This test method may be used to confirm in the presenceof rare earths the stated cerium content of liquid pure cerium orrare earth driers manufactured for use in the coatings industry.5.Interferences5.1 This test method is specific for cerium in the presence ofrare earth metals.Other drier metals with more than onevalence may interfere and should be absent.6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is intended thatall reagents purchased or prepared shall conform to thespecifications of the Committee on Analytical Reagents of theAmerican Chemical Society,where such specifications areavailable.4Other grades may be used,provided it is firstascertained that the reagent is of sufficiently high purity topermit its use without lessening the accuracy of the determi-nation.6.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Type II of Specification D1193.6.3 Ceric Sulfate Solution,Standard(0.1 N)Standardized0.1 N solutions of ceric sulfate(Ce(SO4)2)in 1 N sulfuric acidmay be purchased or prepared.56.4 Ferroin Indicator(0.025 M)Orthophenanthroline fer-rous complex indicator.61This 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 1980.Last previous edition approved in 2005 as D3970 05.DOI:10.1520/D3970-05R11.2For 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.5The sole source of supply of reagent grade 0.1 N solution of ceric sulfate in 1N sulfuric acid,known to the committee at this time is G.Frederick Smith Co.If youare aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.6The sole source of supply of 0.025 M ferroin indicator,known to the committeeat this time is G.Frederick Smith Co.If you are aware of alternative suppliers,please provide this information to ASTM International Headquarters.Your com-ments will receive careful consideration at a meeting of the responsible technicalcommittee,1which you may attend.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.5 Fer