ASTM_D_283_-_13_2019.pdf

Designation:D28313(Reapproved 2019)Standard Test Methods forChemical Analysis of Cuprous Oxide and Copper Pigments1This standard is issued under the fixed designation D283;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 cuprous oxide and copper pigments.1.2 The analytical procedures appear in the following order:SectionsTotal Copper7Total Reducing Power as Cuprous Oxide8 and 9Metallic Copper10 and 11Cuprous Oxide12Cupric Oxide13Metals Other than Copper14 16Chlorides and Sulfates17 and 18Acetone-Soluble Matter19Water20Stability21Coarse Particles22Coarse Particles Insoluble in Nitric Acid231.3 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.5 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 Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D185 Test Methods for Coarse Particles in PigmentsD1193 Specification for Reagent WaterD1208 Test Methods for Common Properties of CertainPigments3.Significance and Use3.1 This collection of test methods is used by pigmentproducers and paint manufacturers for process control,productacceptance,and research and development.4.Treatment of Sample4.1 Grind dry pigments,if lumpy or not finely ground,to afine powder and thoroughly mix(Note 1).Large samples maybe thoroughly mixed and a representative portion taken andpowdered if lumpy or not finely ground.In all cases thoroughlymix the sample before taking portions for analysis.Preserve allsamples in dry,dark,airtight and completely filled bottles orcontainers to prevent oxidation.Some commercial copperoxides appear to segregate or oxidize rather easily.Therefore,the thorough mixing of the sample to ensure homogeneity andthe rapid handling of the sample,when exposed to light and air,are extremely important factors in obtaining accurate resultsNOTE1It is very important that the sample be thoroughly mixed.Some samples of cuprous oxide are not homogeneous so are likely to givetrouble when an attempt is made to obtain concordant results.By placinga few grams of a sample on a sheet of white paper and drawing it out witha spatula,it is frequently found that the sample contains coarse particlesof black scale,along with small balls of bright red cuprous oxide.Thus,it may be necessary to pass the pigment through a No.60(250-m)sieve,break up any lumps of ground pigment by gentle pressure,and grind anycoarse particles failing to pass through the sieve.Since oxidation of slightor even considerable magnitude may take place,these operations shouldbe performed quickly,avoiding prolonged grinding and exposure to lightand air.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 of1These 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 1,2019.Published June 2019.Originallyapproved in 1928.Last previous edition approved in 2013 as D283 13.DOI:10.1520/D0283-13R19.2For 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.3Reagent 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 StatesThis international standard was developed in accordance with internationally