1、Designation:D12687(Reapproved 2019)Standard Test Methods forAnalysis of Yellow,Orange,and Green Pigments ContainingLead Chromate and Chromium Oxide Green1This standard is issued under the fixed designation D126;the number immediately following the designation indicates the year oforiginal adoption o
2、r,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
3、These test methods cover procedures for the chemicalanalysis of yellow,orange,and green pigments containing leadchromate and chromium oxide green.1.2 The analytical procedures appear in the following order:SectionsCHROMEYELLOW,CHROMEORANGE,ANDMOLYBDATEORANGEOrganic Colors and Lakes7Moisture and Othe
4、r Volatile Matter8Matter Soluble in Water9Lead Chromate10 and 11Total Lead12Sulfate13 and 14Carbon Dioxide15Molybdenum16 and 17Extenders18 22Calculation of Substances Other than Insoluble LeadCompounds23 and 24PURECHROMEGREEN ANDREDUCEDCHROMEGREENOrganic Colors and Lakes25Moisture and Other Volatile
5、 Matter26Matter Soluble in Water27Iron Blue28Lead Chromate29 and 30Barium Sulfate and Insoluble Siliceous Material31Total Lead32Sulfate33Calcium Oxide Soluble in Acid34 and 35Extenders36Calculation of Insoluble Lead Compounds37CHROMIUMOXIDEGREENOrganic Colors and Lakes38Moisture and Other Volatile M
6、atter39Matter Soluble in Water40Total Chromium as Chromium Oxide411.3 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 problems,if any,associated with its use.It is th
7、eresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific hazard statements are given in Note 3.1.5 This international standard was developed in accor-dance with in
8、ternationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D280 T
9、est Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD521 Test Methods for Chemical Analysis of Zinc Dust(Metallic Zinc Powder)D1013 Test Method for Determining Total Nitrogen inResins and Plastics(Withdrawn 2007)3D1193 Specification for Reagent WaterE11
10、 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Methods3.1 Chrome Yellow,Chrome Orange,and Molybdate Or-ange:3.1.1 Organic colors and lakes are determined qualitativelyby boiling the sample in water,then ethyl alcohol,and finallychloroform.3.1.2 Moisture and other vola
11、tile matter are determined inaccordance with Test Method A of Test Methods D280.3.1.3 Matter soluble in water is determined by boiling inwater and filtering.1These test methods are under the jurisdiction of ASTM Committee D01 onPaint and Related Coatings,Materials,and Applications and are the direct
12、responsibility of Subcommittee D01.31 on Pigment Specifications.Current edition approved June 1,2019.Published June 2019.Originallyapproved in 1922.Last previous edition approved in 2012 as D126 87(2012).DOI:10.1520/D0126-87R19.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcon
13、tact 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.Copyright ASTM International,100 Barr Harbor Drive,PO
14、Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed 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
15、 World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.1.4 Lead chromate is determined by dissolving the samplein dilute HCl,filtering and titrating potentiometrically withFeSO4solution after addition of HClO4.3.1.5 Total lead is determined by precipitation as leadsulfide solution w
16、ith H2SO4and final precipitation as leadsulfate.3.1.6 Sulfate is determined by dissolving the sample inacetic acid,neutralizing with sodium carbonate,plus additionof HCl to an aliquot followed by addition of BaCl2toprecipitate as barium sulfate.3.1.7 Carbon dioxide is determined by evolution.3.1.8 Molybdenum is determined by precipitation as thesulfide,solution in HNO3and H2SO4,addition of NH4OH andH2SO4.The solution is reduced in a Jones reductor,collectedunder Fe2(SO4)3solution and titrated wi
