1、Designation:D4983(Reapproved 2020)Standard Test Methods ofChemical Analysis of Red Lead1This standard is issued under the fixed designation D49;the number immediately following the designation indicates the year of originaladoption or,in the case of revision,the year of last revision.Anumber in pare
2、ntheses indicates the year of last reapproval.Asuperscriptepsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 These test methods cover procedures for the chemicalanalysis of red lead having the approximate formula Pb3O4(probably PbO22PbO).1.2 The values stated in
3、SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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,health,and en
4、vironmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 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 Stan
5、dards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D50 Test Methods for ChemicalAnalysis of Yellow,Orange,Red,and Brown Pigments Containing Iron and Manga-neseD215 Practice for the Chemical Analy
6、sis of White LinseedOil Paints(Withdrawn 2005)3D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD1193 Specification for Reagent WaterD1208 Test Methods for Common Properties of CertainPigmentsD1301 Test Methods for Chemical Analysis of White Le
7、adPigmentsD1959 Test Method for Iodine Value of Drying Oils andFatty Acids(Withdrawn 2006)33.Treatment of Sample3.1 If the pigment is lumpy or not finely ground,grind it toa fine powder and mix thoroughly.Large samples may bethoroughly mixed and a representative portion taken andpowdered if lumpy or
8、 not finely ground.The sample in allcases shall be thoroughly mixed before taking portions foranalysis.All samples shall be preserved in stoppered bottles orcontainers.4.Purity of Reagents4.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagen
9、ts shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society where suchspecifications are available.4Other grades may be used pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use without lessening the accu
10、racy ofthe determination.4.2 Unless otherwise indicated,references to water shall beunderstood to mean reagent water conforming to Type II ofSpecification D1193.5.Moisture5.1 Determine moisture content with a 2-g specimen inaccordance with Method A of Test Methods D280.Thespecimen is dried for 2 h a
11、t 105C.The loss in weight isconsidered as moisture.6.Organic Color6.1 Boil 2 g of the sample with 25 mLof 95%ethyl alcohol,let settle,decant the supernatant liquid;boil the residue with 25mL of distilled water and decant as before;boil the residue1These test methods are under the jurisdiction of AST
12、M Committee D01 onPaint and Related Coatings,Materials,and Applications and are the directresponsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2020.Published June 2020.Originallyapproved in 1917.Last previous edition approved in 2014 as D49 83(2014).DOI:10.
13、1520/D0049-83R20.2For 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 sta
14、ndard is referenced onwww.astm.org.4ACS Reagent Chemicals,Specifications and Procedures for Reagents andStandard-Grade Reference Materials,American Chemical Society,Washington,DC.For suggestions on the testing of reagents not listed by the American ChemicalSociety,see Analar Standards for Laboratory
15、 Chemicals,BDH Ltd.,Poole,Dorset,U.K.,and the United States Pharmacopeia and National Formulary,U.S.Pharma-copeial Convention,Inc.(USPC),Rockville,MD.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed
16、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.with 25 mL of diluted NH4OH(1+4)and again decant.Boilanother 2-g portion of the sample with 25 mL of chloroform,let settle,and decant the supernatant liquid.If any one of theabove solutions is colored,organic coloring matter is
