ASTM D1762-84(2001)
(Test Method)Standard Test Method for Chemical Analysis of Wood Charcoal
Standard Test Method for Chemical Analysis of Wood Charcoal
SCOPE
1.1 This test method covers the determination of moisture, volatile matter, and ash in charcoal made from wood. The test method is applicable to lumps and briquets and is designed for the evaluation of charcoal quality. The test method employs apparatus that is found in most laboratories and is adapted to routine analyses of a large number of samples.
1.2 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.
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Designation:D1762–84(Reapproved 2001)
Standard Test Method for
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Chemical Analysis of Wood Charcoal
This standard is issued under the fixed designation D 1762; 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 5. Apparatus
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1.1 This test method covers the determination of moisture, 5.1 Mill, for grinding samples.
volatile matter, and ash in charcoal made from wood. The test 5.2 Oven, with automatic temperature control at 105 6 1°C.
method is applicable to lumps and briquets and is designed for 5.3 Muffle Furnace, to control temperatures at 750 6 5°C
the evaluation of charcoal quality. The test method employs and 950 6 5°C.
apparatus that is found in most laboratories and is adapted to 5.4 Analytical Balance, with a capacity of at least 100 g and
routine analyses of a large number of samples. a sensitivity of 0.1 mg.
1.2 This standard does not purport to address all of the 5.5 Containers, airtight, such as screw-top bottles for stor-
safety concerns, if any, associated with its use. It is the age of ground samples.
responsibility of the user of this standard to establish appro- 5.6 Sieves, as specified in Method D 410.
priate safety and health practices and determine the applica- 5.7 Crucibles, porcelain, 41 by 37 mm with porcelain lids.
bility of regulatory limitations prior to use. 5.8 Desiccator,containingcalciumchlorideasdryingagent.
2. Referenced Documents 6. Sample
2.1 ASTM Standards: 6.1 SampleSelection—The sample shall be selected so as to
D 346 Practice for Collection and Preparation of Coke be representative of all of the material contained in a lot.
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Samples for Laboratory Analysis Sample selection shall be carried out in accordance with
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D 410 Method for Sieve Analysis of Coal Practices D 346, D 3176, and D 3180.
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D 3176 Practice for Ultimate Analysis of Coal and Coke 6.2 Sample Preparation—Samples will normally be air-dry
D 3180 Practice for Calculating Coal and Coke Analyses charcoallumpsorbriquets.Rainsoakedorwetsamplesshallbe
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From As-Determined to Different Bases spread out to air-dry before carrying out the analysis. For
purchasespecifications,themoisturecontentofthecharcoal,as
3. Summary of Method
received, shall be determined on samples ground to pass a No.
3.1 The sample is ground in a specified manner and the 20 (850-µm) sieve, since excessive grinding will result in loss
moisture determined as loss in weight in a drying oven at
of moisture due to the generation of heat. For laboratory
105°C.Volatile matter is determined as loss in weight at 950°C evaluation, moisture, ash, and volatile matter shall be deter-
under specified conditions. Ash is determined as the residue
mined on a sample ground as follows:
after burning to constant weight at 750°C. 6.2.1 All of the selected sample shall be ground; no part of
the sample shall be rejected. The sample shall be pulverized
4. Significance and Use
rapidly in a mill. Long grinding times shall be avoided because
4.1 Low quality wood and wood residues are used for wood
of generated heat which will cause loss of volatile material.
charcoal. This test method is used for evaluating the charcoal
Excessive grinding will produce a large amount of fine
to assess the methods of production and assist in developing
particles smaller than a No. 100 (150-µm) sieve. These fine
new methods.
particles contribute to errors of being swept out of the crucible
during the rapid evolution of gases in the determination of
volatile matter. Particles that will be retained on a No. 20
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This test method is under the jurisdiction of ASTM Committee D7 on Wood
(850-µm) sieve shall not be used. Samples with the following
and is the direct responsibility of Subcommittee D07.01 on Fundamental Test
sieve analysis have been found satisfactory:
Methods and Properties.
Current edition approved April 27, 1984. Published June 1984. Originally
published as D 1762 – 60 T. Last previous edition D 1762 – 64 (1977).
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Annual Book of ASTM Standards, Vol 05.06. A Wiley Mill, size No. 2, with a 1-mm screen, or an equivalent mill has been
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Discontinued: see 1988 Annual Book of ASTM Standards, Vol 05.05. found satisfactory for this purpose.
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D1762
themufflefurnaceat750°Cfor6h.Coolthecrucibleswithlids
Passing Sieve Retained on Sieve Sample, %
in place in a desiccator for 1 h and weigh. Repeat burning of
... No. 20 (850-µm) 0
the sample until a succeeding 1-h period of heating results in a
No. 20 (850-µm)
...
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