ASTM D8010-15

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D8010 − 15
StandardPractice 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 4. Summary of Practice
1.1 This practice describes a procedure for the determina- 4.1 Sodiumandpotassiumsaltsareleachedfromthesample
tion of water soluble sodium oxide (Na O) and potassium during a lengthy digestion with water and a wetting agent. The
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oxide (K O) in the analysis of coal samples prepared in concentrations of sodium and potassium are measured in the
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accordance with Practice D2013. filteredliquidbyanappropriatespectrometrictechniqueforthe
elements sodium and potassium.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
5. Significance and Use
standard.
5.1 Results obtained from the practice are used to serve a
1.3 This practice is derived in part from the ASME proce-
2 number of interests, including the indication of possible boiler
dure water soluble alkalis.
tube fouling and possible furnace corrosion problems.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Interferences
responsibility of the user of this standard to establish appro-
6.1 Several types of interference effects may contribute to
priate safety and health practices and determine the applica-
inaccuracies in the determination of sodium and potassium.
bility of regulatory limitations prior to use.
Follow the manufacturer’s operating guide to develop and
apply correction factors to compensate for the interferences.
2. Referenced Documents
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2.1 ASTM Standards:
7. Apparatus
D121 Terminology of Coal and Coke
7.1 Analytical balance, with sensitivity of 0.1 mg.
D1193 Specification for Reagent Water
7.2 Digestion Apparatus
D2013 Practice for Preparing Coal Samples for Analysis
7.2.1 Stirring Hotplate and Bars, with operating tempera-
D3173 Test Method for Moisture in the Analysis Sample of
ture up to 200 °C.
Coal and Coke
7.2.1.1 Erlenmeyer flask with cover, 250 mL.
D3302 Test Method for Total Moisture in Coal
7.2.1.2 Refluxing column (optional).
D7582 Test Methods for Proximate Analysis of Coal and
7.2.2 Hot Block Digestion
Coke by Macro Thermogravimetric Analysis
7.2.2.1 Polycarbonate Bottles, 250 mL capacity with an
E832 Specification for Laboratory Filter Papers
O-ring seal and screw cap, capable of withstanding tempera-
tures up to 130 °C, the pressure that is developed during the
3. Terminology
digestion, and resistant to oxidation. Other types of bottles or
3.1 For definitions of terms used in this practice, refer to
vials may be used provided they are capable of withstanding
Terminology D121.
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
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
be ash-free, quantitative Type II filter paper, as described in
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
Specification E832.
Analysis.
Current edition approved Nov. 1, 2015. Published December 2015. DOI:
7.3.2 Filter (gravity or vacuum).
10.1520/D8010-15.
7.3.3 Volumetric flask, 250 mL.
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“Coal Fouling and Slagging Parameters.” ASME H-86. Editor E.C.
Winegartner, 1974.
7.4 Spectrometer—Because of the differences between vari-
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
ous makes and models of satisfactory instruments, no detailed
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
operating instructions can be provided. Instead, follow the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. instructions provided by the manufacturer of the particular
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D8010 − 15
instrument. Sensitivity, instrumental detection limit, precision, 10. Procedure
linear dynamic range, and interference effects must be inves-
10.1 The solutions and proportions described below are the
tigated and established for each individual analyte line on that
typical samples as represented by American coals. Therefore,
particular instrument. All measurements must be within the
stronger or weaker dilutions may be required to establish
instrument’s linear range in which correction factors are valid.
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