ASTM_D_126_-_87_2012.pdf

Designation:D12687(Reapproved 2012)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 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 Department of Defense.1.Scope1.1 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,ANDMOLYBDATEORANGEORGANICCOLORS ANDLAKES7MOISTURE ANDOTHERVOLATILEMATTER8MATTERSOLUBLE INWATER9LEADCHROMATE10AND11TOTALLEAD12SULFATE13AND14CARBONDIOXIDE15MOLYBDENUM16AND17EXTENDERS18-22Calculation of Substances Other than Insoluble LeadCompounds23 and 24PURECHROMEGREEN ANDREDUCEDCHROMEGREENORGANICCOLORS ANDLAKES25MOISTURE ANDOTHERVOLATILEMATTER26MATTERSOLUBLE INWATER27IRONBLUE28LEADCHROMATE29AND30BARIUMSULFATE ANDINSOLUBLESILICEOUSMATERIAL31TOTALLEAD32SULFATE33CALCIUMOXIDESOLUBLE INACID34AND35EXTENDERS36CALCULATION OFINSOLUBLELEADCOMPOUNDS37CHROMIUMOXIDEGREENORGANICCOLORS ANDLAKES38MOISTURE ANDOTHERVOLATILEMATTER39MATTERSOLUBLE INWATER40TOTALCHROMIUM ASCHROMIUMOXIDE411.3 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 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.Specific hazardstatements are given in Note 3.2.Referenced Documents2.1 ASTM Standards:2D280 Test 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Analysis of Zinc Dust(Metallic Zinc Powder)D1013 Test Method for Determining Total Nitrogen inResins and Plastics(Withdrawn 2007)3D1193 Specification for Reagent WaterE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Summary of Test Methods3.1 Chrome Yellow,Chrome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 volatile 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.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 with H2SO4and final precipitation as leadsulfate.3.1.6 Sulfate is determined by dissolving the sample inacetic acid,neutralizing with sodium carbonate,plus addition1These 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 June 1,2012.Published August 2012.Originallyapproved in 1922.Last previous edition approved in 2006 as D126 87(2006).DOI:10.1520/D0126-87R12.2For 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 of 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 with KMnO4solution.3.1.9 Extenders are either:3.1.9.1 Calcium carbonate,calcium sulfate,magnesium car-bonate or;(a)The compounds in 3.1.9.1 are determined qualitativelyby precipitation with ammonium solution.(b)If chromium is present,it is reduced and the lead saltsdissolved in dissolving solution.Hydroxides and hydrousoxides are precipitated by addition of HCl and NH4OH andfiltered.CaC2O4is precipitated with calcium oxalate solutionand filtered,ashed and weighed as CaO.Alternatively,theprecipitate is dissolved in H2SO4and titrated with KMnO4.Magnesium is determined on the filtrate from calcium deter-mination by precipitation as the phosphate with ammoniumphosphate solution.3.2 Chromium Oxide G