ASTM D8010-16

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it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D8010 − 15 D8010 − 16
Standard Practice for
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Determination of Water Soluble Alkali Content in Coal
This standard is issued under the fixed designation D8010; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice describes a procedure for the determination of water soluble sodium as sodium oxide (Na O) and potassium
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as potassium oxide (K O) in the analysis of coal samples prepared in accordance with Practice D2013.
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1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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1.3 This practice is derived in part from the ASME procedure water soluble alkalis.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
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2.1 ASTM Standards:
D121 Terminology of Coal and Coke
D1193 Specification for Reagent Water
D2013 Practice for Preparing Coal Samples for Analysis
D3173 Test Method for Moisture in the Analysis Sample of Coal and Coke
D3302 Test Method for Total Moisture in Coal
D3180 Practice for Calculating Coal and Coke Analyses from As-Determined to Different Bases
D7448 Practice for Establishing the Competence of Laboratories Using ASTM Procedures in the Sampling and Analysis of Coal
and Coke
D7582 Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
E832 Specification for Laboratory Filter Papers
3. Terminology
3.1 For definitions of terms used in this practice, refer to Terminology D121.
4. Summary of Practice
4.1 Sodium and potassium salts are leached from the sample during a lengthy digestion with water and a wetting agent. The
concentrations of sodium and potassium are measured in the filtered liquid by an appropriate spectrometric technique for the
elements sodium and potassium.
5. Significance and Use
5.1 Results obtained from the practice are used to serve a number of interests, including the indication of possible boiler tube
fouling and possible furnace corrosion problems.
6. Interferences
6.1 Several types of interference effects may contribute to inaccuracies in the determination of sodium and potassium. Follow
the manufacturer’s operating guide to develop and apply correction factors to compensate for the interferences.
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This test method is under the jurisdiction of ASTM Committee D05 on Coal and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of Analysis.
Current edition approved Nov. 1, 2015Sept. 1, 2016. Published December 2015September 2016. Originally approved in 2015. Last previous edition approved in 2015 as
D8010–15. DOI: 10.1520/D8010-15.10.1520/D8010-16.
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“Coal Fouling and Slagging Parameters.” ASME H-86. Editor E.C. Winegartner, 1974.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
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D8010 − 16
7. Apparatus
7.1 Analytical balance, with sensitivity of 0.1 mg.
7.2 Digestion Apparatus
7.2.1 Stirring Hotplate and Bars, with operating temperature 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 Digestion
7.2.2.1 Polycarbonate Bottles, 250 mL capacity with an O-ring seal and screw cap, capable of withstanding temperatures up to
130 °C, the pressure that is developed during the digestion, and resistant to oxidation. Other types of bottles or vials may be used
provided they are capable of withstanding the temperatures and pressures developed during the digestion.
7.3 Filtering Apparatus
7.3.1 Filter Paper or 0.45 micron filter. The paper used must be ash-free, quantitative Type II filter paper, as described in
Specification E832.
7.3.2 Filter (gravity or vacuum).
7.3.3 Volumetric flask, 250 mL.
7.4 Spectrometer—Because of the differences between various makes and models of satisfac
...