1、Designation:D184586(Reapproved 2020)Standard Test Methods forChemical Analysis of Strontium Chromate Pigment1This standard is issued under the fixed designation D1845;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.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 the chemical analys
3、is ofstrontium chromate pigment.1.2 The analytical procedures appear in the following order:SectionsStrontium by the Strontium Sulfate Method7 to 10Chromium by the Thiosulfate Method11 to 14Chloride Content15Sulfate Content16Moisture and Other Volatile Matter17Coarse Particles18Mass Color and Tintin
4、g Strength191.3 This values stated in SI units are to be considered 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 estab
5、lish 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 fo
6、r 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 PigmentsD280 Test Methods for Hygroscopic Moisture(and OtherMatt
7、er Volatile Under the Test Conditions)in PigmentsD387 Test Method for Color and Strength of ChromaticPigments with a Mechanical MullerD444 Test Methods for Chemical Analysis of Zinc YellowPigment(Zinc Chromate Yellow)D1193 Specification for Reagent Water3.Significance and Use3.1 These test methods m
8、ay be used to confirm the statedstrontium oxide and chromium oxide content of strontiumchromate.4.Apparatus4.1 Gooch crucible.4.2 Electric Furnace,capable of 800C.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents sh
9、allconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,where suchspecifications are available.3Other grades may be used,pro-vided it is first ascertained that the reagent is of sufficientlyhigh purity to permit its use,without lessening the accuracy
10、ofthe determination.5.2 Unless otherwise indicated,references to water shall beunderstood to mean Type II of Specification D1193.6.Preparation of Sample6.1 Mix the sample thoroughly.Take a sufficient quantityfor chemical analysis and pass it through a No.325(4-m)sieve.STRONTIUM BY THE STRONTIUM SULF
11、ATEMETHOD7.Reagents7.1 Acetic Acid(glacial).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 June 1,2020.Published Ju
12、ne 2020.Originallyapproved in 1961.Last previous edition approved in 2014 as D1845 86(2014).DOI:10.1520/D1845-86R20.2For 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 s
13、tandards Document Summary page onthe ASTM website.3ACS 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
14、 for Laboratory 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
15、 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 World Trade Organization Technical Barriers to Trade(TBT)Committee.17.2 Ammonium
16、 Hydroxide(1+3)Mix 1 volume of concen-trated ammonium hydroxide(NH4OH,sp gr 0.90)with 3volumes of water.7.3 Ethyl Alcohol,conforming to Formula No.2B or No.30of the U.S.Bureau of Alcohol,Tobacco,and Firearms.7.4 Hydrochloric Acid(1+1)Mix equal volumes of con-centrated hydrochloric acid(HCl,sp gr 1.19)and water.7.5 Sulfuric Acid(1+19)Mix 1 volume of concentratedsulfuric acid(H2SO4,sp gr 1.84)with 19 volumes of water.8.Procedure8.1 Weigh to 0.1 mg about 0.5 g of the sample into a400-mL beaker.Add