ASTM_D_3280_-_85_2014.pdf

Designation:D328085(Reapproved 2014)Standard Test Methods forAnalysis of White Zinc Pigments1This standard is issued under the fixed designation D3280;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 These test methods cover procedures for the analysis ofwhite zinc pigments.1.2 The analytical procedures appear in the following order:SectionPreparation of Sample6Zinc OxideTotal Zinc,Using Diphenylamine as Internal Indicator7Total Zinc,Using Uranyl Acetate as External Indicator8Total Impurities9Total Sulfur10Moisture and Other Volatile Matter11Leaded Zinc OxideTotal Lead12Total Zinc13Total Sulfur14Total Impurities15Moisture and Other Volatile Matter16Water-Soluble Salts17Zinc SulfideZinc Oxide18Zinc Sulfide19Water-Soluble Salts20Moisture and Other Volatile Matter21Barium Sulfate22Titanium Dioxide231.3 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.2.Referenced Documents2.1 ASTM Standards:2D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD1193 Specification for Reagent WaterD1394 Test Methods for Chemical Analysis of White Tita-nium PigmentsE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Method3.1 Zinc Oxide:3.1.1 Total ZincDetermined using diphenylamine as aninternal indicator and also using uranyl acetate as an externalindicator.Total impurities are calculated.3.1.2 Total SulfurDetermined as BaSO4and calculated tosulfur.3.1.3 Moisture and Volatile MatterDetermined in accor-dance with Method A of Test Methods D280.3.2 Leaded Zinc Oxide:3.2.1 Total LeadDetermined as PbSO4and calculated topercent PbO.3.2.2 Total ZincDetermined on the filtrate from procedurein 13.2.1 in accordance with methods in Sections 7 or 8.3.2.3 Total SulfurDetermined as BaSO4and calculated topercent SO3.3.2.4 Total ImpuritiesCalculated from compositional data.3.2.5 Moisture and Other Volatile MatterDetermined inaccordance with Method A of Test Methods D280.3.2.6 Water Soluble SaltsDetermined gravimetrically.3.3 Zinc Sulfide:3.3.1 Total ZincDetermined using uranyl acetate externalindicator in accordance with Section 9.3.3.2 Zinc SulfideDetermined in accordance with Sections8 or 9 and calculating ZnO to ZnS.3.3.3 Water Soluble SaltsDetermined in accordance withSection 18.3.3.4 MoistureDetermined in accordance with Method Aof Test Methods D280.3.3.5 Barium SulfateThe sample is treated with N2SO4and Na2CO3and the residue of BaCO3is dissolved in NCl and(NH4)2SO4added to precipitate BaSO4,which is weighed.3.3.6 Titanium DioxideDetermined in accordance withTest Methods D1394.1These 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 Dec.1,2014.Published December 2014.Originallyapproved in 1973.Last previous edition approved in 2009 as D3280 85(2009).DOI:10.1520/D3280-85R14.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 White zinc pigments find considerable use in whitepaints,and as such it is useful to formulators and users to beable to monitor the amounts of these pigments in whole paints.It is also of interest to raw material suppliers and paintproducers to check the specifications of each pigment.5.Reagents5.1 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.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.5.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean Type II reagent gradewater conforming to Specification D1193.5.3 Concentration of Reagents:5.3.1 Concentrated Acids and Ammonium HydroxideWhen ac