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ASTM D2961-02(2007)

(Test Method)

Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize

Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize

SIGNIFICANCE AND USE
The measurement of total moisture is required to determine whether coal meets commercial or environmental specifications, or both. Within the limitations prescribed in the scope, this test method describes a procedure for determination of total moisture that requires less time than the procedures described in Test Method D 3302.
SCOPE
1.1 This test method covers a single-stage procedure for the determination of total moisture less than 15 % in coal reduced to 2.36- mm (No. 8 sieve) topsize. This test method is for determination of total moisture only. Materials subjected to this test shall not be used in the determination of other test parameters. It is recognized that the conditions of the test can increase the potential for significant oxidation effects on some coals. If the oxidation potential is of concern, the use of this single-stage method shall involve prior agreement between the parties involved. This test method shall not be construed as the referee standard test method for total moisture. For referee purposes, users of this test method are referred to Test Method D 3302 for moisture determination methods which are not as susceptible to oxidation effects.
1.2 Statistical analysis of data from several sources indicates that at a 95% confidence level, there is statistically no significant difference between the mean value of the results obtained by D 2961 and D 3302 (that is, no bias is detected between the two methods at the 95% confidence level) for moisture levels between 1.4% and 15.8%. These two test methods were not compared in this study for some ranks of coal including lignite and anthracite.
1.3 The values stated in SI units are to be regarded as the standard.
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.

General Information

Status
Historical
Publication Date
30-Apr-2007
ICS
75.160.10 - Solid fuels
Technical Committee
D05 - Coal and Coke
Drafting Committee
D05.21 - Methods of Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D2961-02e1 - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize
Effective Date
01-May-2007
Replaced By
ASTM D2961-11 - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize
Effective Date
01-Nov-2011
Referred By
ASTM D6796-21e1 - Standard Practice for Production of Coal, Coke and Coal Combustion Samples for Interlaboratory Studies
Effective Date
01-May-2007

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ASTM D2961-02(2007) - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) TopsizeASTM D2961-02(2007) - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize
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ASTM D2961-02(2007) - Standard Test Method for Single-Stage Total Moisture Less than 15% in Coal Reduced to 2.36-mm (No. 8 Sieve) Topsize
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D2961–02 (Reapproved 2007)
Standard Test Method for
Single-Stage Total Moisture Less than 15 % in Coal
Reduced to 2.36-mm (No. 8 Sieve) Topsize
This standard is issued under the fixed designation D2961; 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 D3302 Test Method for Total Moisture in Coal
1.1 This test method covers a single-stage procedure for the
3. Summary of Test Method
determination of total moisture less than 15 % in coal reduced
3.1 Moisture is determined by establishing the weight loss
to 2.36- mm (No. 8 sieve) topsize. This test method is for
of the coal sample by drying in an oven with forced-air
determinationoftotalmoistureonly.Materialssubjectedtothis
circulation.
test shall not be used in the determination of other test
parameters. It is recognized that the conditions of the test can
4. Significance and Use
increase the potential for significant oxidation effects on some
4.1 The measurement of total moisture is required to deter-
coals. If the oxidation potential is of concern, the use of this
mine whether coal meets commercial or environmental speci-
single-stage method shall involve prior agreement between the
fications, or both. Within the limitations prescribed in the
parties involved. This test method shall not be construed as the
scope, this test method describes a procedure for determination
referee standard test method for total moisture. For referee
of total moisture that requires less time than the procedures
purposes, users of this test method are referred to Test Method
described in Test Method D3302.
D3302 for moisture determination methods which are not as
susceptible to oxidation effects.
5. Apparatus
1.2 Statistical analysis of data from several sources indi-
5.1 Drying Pans, noncorrodible, stable at the temperature
cates that at a 95% confidence level, there is statistically no
used, and of such size that the sample can be spread to a depth
significant difference between the mean value of the results
of not more than 25 mm (1 in.).
obtained by D2961 and D3302 (that is, no bias is detected
5.1.1 The pan size may be varied to suit the size of the
between the two methods at the 95% confidence level) for
sample and the oven. The height of the sides shall be no more
moisture levels between 1.4% and 15.8%. These two test
than 40 mm (1 ⁄2 in.) so that air is not restricted in passing over
methods were not compared in this study for some ranks of
the coal.
coal including lignite and anthracite. (See 9.2.)
5.2 Drying Oven, forced air-type capable of maintaining a
1.3 The values stated in SI units are to be regarded as the
temperature of 107 6 3°C and constructed to provide for a
standard.
continuous air flow to all parts of the oven.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
6. Sampling
responsibility of the user of this standard to establish appro-
6.1 The sample shall be prepared according to Test Method
priate safety and health practices and determine the applica-
D2013 except that the 500 g portion can be further subdivided
bility of regulatory limitations prior to use.
to 125 g.
6.2 That portion of the sample used for the moisture
2. Referenced Documents
determination shall have a minimum weight of 125 g.
2.1 ASTM Standards:
D2013 Practice for Preparing Coal Samples for Analysis
7. Procedure
7.1 Weigh the empty drying pan. Record the mass in grams
This test method is under the jurisdiction of ASTM Committee D05 on Coal
as W . Transfer the sample from the sample container to the
and Coke and is the direct responsibility of Subcommittee D05.21 on Methods of
drying pan. Distribute the sample uniformly over the pan. Do
Analysis.
not exceed a depth of 25 mm (1 in.). Place the empty sample
Current edition approved May 1, 2007. Published May 2007. Originally
´1
approved in 1971. Last previous edition approved in 2002 as D2961 – 02 . DOI:
container in the drying pan.Weigh the drying pan, coal sample,
10.1520/D2961-02R07.
and empty sample c
...

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ABSTRACT
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1.1 These test methods pertain to the determination of antimony, arsenic, beryllium, cadmium, chromium, cobalt, copper, lead, manganese, molybdenum, nickel, vanadium, and zinc in coal and coke. These test methods can also be used for the analysis of residues from coal combustion processes. Additionally, there are specific test methods outlined that pertain to the determination of rare earth elements in coal and coal combustion residues.
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4.1 This test method permits measurement of the total mass fraction of arsenic and selenium in coal for the purpose of evaluating these elements where they can be of concern, for example, in coal combustion. When coal samples are prepared for analysis in accordance with this test method, the arsenic and selenium are quantitatively retained and are representative of the total mass fraction in the coal.
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1.1 This test method2 covers the determination of total arsenic in the range of 0.7 ug/g to 12 ug/g and selenium in the range of 0.6 ug/g to 5 ug/g in coal.  
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