1、Designation:D801015Standard Practice forDetermination of Water Soluble Alkali Content in Coal1This standard is issued under the fixed designation D8010;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A numbe
2、r in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice describes a procedure for the determina-tion of water soluble sodium oxide(Na2O)and potassiumoxide(K2O)in the analysis of coal sam
3、ples prepared inaccordance with Practice D2013.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 This practice is derived in part from the ASME proce-dure water soluble alkalis.21.4 This standard does not purport to address
4、 all of thesafety concerns,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.2.Referenced Documents2.1 ASTM Standards:3D121 Terminology of C
5、oal and CokeD1193 Specification for Reagent WaterD2013 Practice for Preparing Coal Samples for AnalysisD3173 Test Method for Moisture in the Analysis Sample ofCoal and CokeD3302 Test Method for Total Moisture in CoalD7582 Test Methods for Proximate Analysis of Coal andCoke by Macro Thermogravimetric
6、 AnalysisE832 Specification for Laboratory Filter Papers3.Terminology3.1 For definitions of terms used in this practice,refer toTerminology D121.4.Summary of Practice4.1 Sodium and potassium salts are leached from the sampleduring a lengthy digestion with water and a wetting agent.Theconcentrations
7、of sodium and potassium are measured in thefiltered liquid by an appropriate spectrometric technique for theelements sodium and potassium.5.Significance and Use5.1 Results obtained from the practice are used to serve anumber of interests,including the indication of possible boilertube fouling and po
8、ssible furnace corrosion problems.6.Interferences6.1 Several types of interference effects may contribute toinaccuracies in the determination of sodium and potassium.Follow the manufacturers operating guide to develop andapply correction factors to compensate for the interferences.7.Apparatus7.1 Ana
9、lytical balance,with sensitivity of 0.1 mg.7.2 Digestion Apparatus7.2.1 Stirring Hotplate and Bars,with operating tempera-ture up to 200 C.7.2.1.1 Erlenmeyer flask with cover,250 mL.7.2.1.2 Refluxing column(optional).7.2.2 Hot Block Digestion7.2.2.1 Polycarbonate Bottles,250 mL capacity with anO-rin
10、g seal and screw cap,capable of withstanding tempera-tures up to 130 C,the pressure that is developed during thedigestion,and resistant to oxidation.Other types of bottles orvials may be used provided they are capable of withstandingthe temperatures and pressures developed during the digestion.7.3 F
11、iltering Apparatus7.3.1 Filter Paper or 0.45 micron filter.The paper used mustbe ash-free,quantitative Type II filter paper,as described inSpecification E832.7.3.2 Filter(gravity or vacuum).7.3.3 Volumetric flask,250 mL.7.4 SpectrometerBecause of the differences between vari-ous makes and models of
12、satisfactory instruments,no detailedoperating instructions can be provided.Instead,follow theinstructions provided by the manufacturer of the particular1This test method is under the jurisdiction of ASTM Committee D05 on Coaland Coke and is the direct responsibility of Subcommittee D05.21 on Methods
13、 ofAnalysis.Current edition approved Nov.1,2015.Published December 2015.DOI:10.1520/D8010-15.2“Coal Fouling and Slagging Parameters.”ASME H-86.Editor E.C.Winegartner,1974.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual
14、Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 instrument.Sensitivity,instrumental detection limit,precision,linear dynamic range,an
15、d interference effects must be inves-tigated and established for each individual analyte line on thatparticular instrument.All measurements must be within theinstruments linear range in which correction factors are valid.It is the responsibility of the analyst to verify that theinstrument configurat
16、ion and operating conditions used satisfythe analytical requirements of this method and to maintainquality control data confirming instrument performance andanalytical results.8.Reagents and Materials8.1 Purity of ReagentsUse reagent grade chemicals in alltests that conform to the specifications of the Committee onAnalytical Reagents of theAmerican Chemical Society,4wheresuch specifications are available.8.2 Purity of WaterUnless otherwise indicated,referencesto water are understood to mean Type