ASTM_D_521_-_02_2012.pdf

Designation:D52102(Reapproved 2012)Standard Test Methods forChemical Analysis of Zinc Dust(Metallic Zinc Powder)1This standard is issued under the fixed designation D521;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 These test methods cover procedures for the chemicalanalysis of metallic zinc powder in the form commerciallyknown as zinc dust for use as a pigment in paints.1.2 The analytical procedures appear in the following order:SectionsMoisture and Other Volatile Matter7Coarse Particles8Matter Soluble in Hexane9 and 10Total Zinc11 and 12Metallic Zinc13 and 14Zinc Oxide15Calcium16 and 17Lead18Iron19Cadmium20Chlorine21 and 22Sulfur23 and 241.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.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.2.Referenced Documents2.1 ASTM Standards:2B214 Test Method for Sieve Analysis of Metal PowdersD185 Test Methods for Coarse Particles in PigmentsD280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD1193 Specification for Reagent WaterD6580 Test Method for The Determination of Metallic ZincContent in Both Zinc Dust Pigment and in Cured Films ofZinc-Rich CoatingsE40 Method for Chemical Analysis of Slab Zinc(Spelter)(Withdrawn 1993)3E68 Method for Polarographic Determination of Lead andCadmium in Zinc(Withdrawn 1980)33.Significance and Use3.1 These test methods compile procedures which can beused to check the composition of purity of metallic zincpowder.This information is useful to both the formulator andusers.4.Treatment of Sample4.1 Store the laboratory sample in a tightly stoppered bottleto protect it from oxidation.Mix the whole sample thoroughlybefore taking portions for analysis.5.Purity of Reagents5.1 Purity of ReagentsUnless otherwise indicated,it isintended that all reagents shall conform to the specifications ofthe Committee onAnalytical Reagents of theAmerican Chemi-cal Society,where such specifications are available.4Othergrades may be used,provided it is first ascertained that thereagent is of sufficiently high purity to permit its use withoutlessening the accuracy of the determination.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean reagent water conformingto Type II of Specification D1193.6.Precision6.1 Precision statements have not been established.MOISTURE AND OTHER VOLATILE MATTER7.Procedure7.1 Determine moisture and other volatile matter in accor-dance with Method A of Test Methods D280,except heat thesample for only 1 h.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 1939.Last previous edition approved in 2007 as D521 02(2007).DOI:10.1520/D0521-02R12.2For 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 COARSE PARTICLES8.Procedure8.1 Determine the percent of coarse particles in the pigmentin accordance with Test Methods D185 or B214.MATTER SOLUBLE IN HEXANE9.Reagent9.1 HexanePure hexane or commercial hexane or petro-leum ether of boiling point not higher than 75C.Redistillbefore using.10.Procedure10.1 Place 100 g of the pigment in an extraction thimble ina Soxhlet extraction apparatus.Record the tare weight of thereceiving flask.Charge the flask with a suitable volume ofhexane and extract the sample for 4 h,subjecting the specimento not less than 20 extractions in this time.Make a blankdetermination at the same time.10.2 Remove the receiving flask,evaporate or distill off thehexane on a steam bath,and dry the flask at 105 6 2C for 1h.Cool and wei