ASTM D3173-00

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Designation: D 3173 – 00
Standard Test Method for
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Moisture in the Analysis Sample of Coal and Coke
This standard is issued under the fixed designation D 3173; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope analysis of coal and coke.
1.1 This test method covers the determination of moisture in
5. Analysis Sample
the analysis sample of coal or coke. It is used for calculating
5.1 The analysis sample is that sample which has been
other analytical results to a dry basis. When used in conjunc-
pulverized to pass 250-μm (No. 60) sieve as prepared in
tion with the air drying loss as determined in accordance with
accordance with Practice D 346 or Method D 2013.
Method D 2013 or Practice D 346, each analytical result can be
calculated to an as-received basis:
6. Apparatus
1.2 This standard does not purport to address all of the
6.1 Drying Oven, for coal samples:
safety concerns, if any, associated with its use. It is the
6.1.1 For determining the moisture of coal, the oven shall be
responsibility of the user of this standard to establish appro-
so constructed as to have a uniform temperature in all parts,
priate safety and health practices and determine the applica-
have a minimum of air space, and be capable of temperature
bility of regulatory limitations prior to use.
regulation between the limits of 104 and 110°C. It may be of
2. Referenced Documents the form shown in Fig. 1. Provision shall be made for renewing
the preheated air in the oven at the rate of two to four times a
2.1 ASTM Standards:
minute, with the air dried as defined in 7.1.
D 346 Practice for Collection and Preparation of Coke
2 6.1.2 In the oven shown in Fig. 1, the door should contain a
Samples for Laboratory Analysis
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hole of approximately ⁄8 in. (3.2 mm) in diameter near the
D 2013 Method of Preparing Coal Samples for Analysis
bottom to permit a free flow of air through the oven space.
D 3180 Practice for Calculating Coal and Coke Analyses
2 6.2 Drying Oven, for coke samples. For determining the
from As-Determined to Different Bases
2 moisture of coke, an ordinary drying oven with openings for
D 3302 Test Method for Total Moisture in Coal
natural air circulation and capable of temperature regulation
3. Summary of Test Method between limits of 104 and 110°C may be used.
6.3 Capsules, with covers. A convenient form, which allows
3.1 Moisture is determined by establishing the loss in
the ash determination to be made on the same sample, is a
weight of the sample when heated under rigidly controlled
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porcelain capsule, ⁄8 in. (22 mm) in depth and 1 ⁄4in. (44 mm)
conditions of temperature, time and atmosphere, sample
in diameter, or a fused silica capsule of similar shape. These
weight, and equipment specifications.
capsules shall be used with a well-fitting flat aluminum cover,
4. Significance and Use
illustrated in Fig. 2. Platinum crucibles or glass capsules with
ground-glass caps may also be used. They should be as shallow
4.1 Moisture as determined by this test method is used for
as possible, consistent with convenient handling.
calculating other analytical results to a moisture free basis
using procedures in Practice D 3180. Moisture percent deter-
7. Reagents
mined by this test method may be used in conjunction with the
7.1 Dry Air—Air used to purge the drying oven should be
air-dry moisture loss determined in Method D 2013 and Test
dried to a moisture content of 1.9 mg/L or less. (Dew
Method D 3302 to determine total moisture in coal. Total
point − 10°C or less.) Any desiccant or drying method capable
moisture is used for calculating other analytical results to “as
of achieving this degree of dryness is suitable.
received” basis using Practice D 3180. Moisture, ash, volatile
7.2 Desiccants—Materials suitable for use in the desiccator
matter, and fixed carbon percents constitute the proximate
may be chosen from the following:
7.2.1 Anhydrous Calcium Sulfate (0.004 mg/L).
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This test method is under the jurisdiction of ASTM Committee D05 on Coal
7.2.2 Silica Gel.
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
7.2.3 Magnesium Perchlorate (0.0005 mg/L).
Analysis.
7.2.4 Sulfuric Acid, Concentrated (0.003 mg/L).
Current edition approved Nov. 10, 2000. Published January 2001. Originally
7.2.5 The desiccant must be kept fresh enough to assure that
published as D 3173 – 73. Last previous edition D 3173 – 87 (1996).
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Annual Book of ASTM Standards, Vol 05.05.
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