1、Designation:D71886(Reapproved 2014)Standard Test Methods forAnalysis of Aluminum Silicate Pigment1This standard is issued under the fixed designation D718;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A nu
2、mber 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 the analysis of aluminumsilicate pigment.1.2 The values stated in SI units are to be regarded as thestandard.The val
3、ues given in parentheses are for informationonly.1.3 This standard does not purport to address the safetyconcerns associated with its use.It is the responsibility of theuser of this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tion
4、s prior to use.2.Referenced Documents2.1 ASTM Standards:2D234 Specification for Raw Linseed Oil(Withdrawn 2007)3D280 Test Methods for Hygroscopic Moisture(and OtherMatter Volatile Under the Test Conditions)in PigmentsD717 Test Methods for Analysis of Magnesium SilicatePigmentD1193 Specification for
5、Reagent WaterD1208 Test Methods for Common Properties of CertainPigmentsD2448 Test Method for Water-Soluble Salts in Pigments byMeasuring the Specific Resistance of the Leachate of thePigmentE11 Specification for Woven Wire Test Sieve Cloth and TestSieves3.Significance and Use3.1 These test methods
6、may be used to confirm the statedaluminum oxide and SiO2content of aluminum silicate forquality control.4.Apparatus4.1 Platinum Crucible.4.2 Electric furnace(or gas burner),capable of 1050 to1100C.4.3 Volumetric flask,100 and 250 mL.4.4 Colorimeter,with transmission range from 400 to 550nm.4.5 High
7、Silica Crucible.5.Purity of Reagents5.1 Reagent grade chemicals shall be used in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee on AnalyticalReagents of the American Chemical Society,4where suchspecifications are available.Ot
8、her 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 ofthe determination.5.2 Unless otherwise indicated,references to water shall beunderstood to mean Type II of Specification D1193.SILICON DIOXIDE6.P
9、rocedure6.1 Determine the silicon dioxide content in accordancewith Test Methods D717.ALUMINUM OXIDE7.Reagents7.1 Ammonium Acetate(20%)Dissolve 200 g of ammo-nium acetate(NH4C2H3O2)in 1 L of distilled water.7.2 Ammonium Chloride Solution(20 g/L)Dissolve 20 gof ammonium chloride(NH4Cl)in water and di
10、lute to 1 L.7.3 Ammonium Hydroxide(sp gr 0.90Concentrated am-monium hydroxide(NH4OH).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
11、edition approved Dec.1,2014.Published December 2014.Originallyapproved in 1943.Last previous edition approved in 2008 as D718 86(2008).DOI:10.1520/D0718-86R14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTM
12、Standards 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.4Reagent Chemicals,American Chemical Society Specifications,AmericanChemical Society,Washington,DC.For suggestions on the t
13、esting 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 Bo
14、x C700,West Conshohocken,PA 19428-2959.United States1 7.4 Diphenylamine Indicator Solution(1 g/100 mL)Dissolve 1 g of diphenylamine in 100 mL of concentratedsulfuric acid(H2SO4,sp gr 1.84).7.5 Hydrochloric Acid(sp gr 1.19)Concentrated hydro-chloric acid(HCl).7.6 Hydrochloric Acid(1+3)Mix 1 volume of
15、 concen-trated HCl(sp gr 1.19)with 3 volumes of water.7.7 Hydrofluoric Acid(48%)Concentrated hydrofluoricacid(HF).7.8 Hydrogen Peroxide(H2O2,3%,freshly prepared)Mix 1 volume of H2O2(30%)with 9 volumes of distilledwater.7.9 Hydroxylamine Hydrochloride(10%)Dissolve 10 gof NH2OH HCl in 100 mL of distil
16、led water.Prepare freshweekly.7.10 Iron StandardDissolve 0.1 g of analytical grade ironwire in 10 mL of HCl(1+1)and dilute to 1 L.Each millilitrecontains 0.1 mg of Fe.7.11 Mercuric Chloride Solution(HgCl2),saturated.7.12 Methyl Red Indicator SolutionDissolve 0.2 g ofmethyl red in 100 mL of methanol,ethanol,or isopropanol.7.13 Potassium Dichromate,Standard Solution(0.05 N)Dissolve 2.457 g of potassium dichromate(K2Cr2O7)inwater and dilute to 1 L.Standardize against National Bureau ofStandards sta
