ASTM D3873-01
(Test Method)Standard Test Method for Valency State of the Arsenic Component of Ammoniacal Copper Arsenate Solutions (Withdrawn 2006)
Standard Test Method for Valency State of the Arsenic Component of Ammoniacal Copper Arsenate Solutions (Withdrawn 2006)
SCOPE
1.1 This test method is intended for testing batches of concentrated ammoniacal copper zinc arsenate (ACZA) solution, prepared by air-oxidation of trivalent arsenic. The test method provides a means of confirming that oxidation has been completed and that at least 99.5 % of the arsenic has been oxidized. The sample for testing should contain 100 ± 20 mg of potential As2 O5. A200-mL aliquot of a concentrate containing 8 to 12 % of preservative oxides is suitable.
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.
WITHDRAWN RATIONALE
This test method is intended for testing batches of concentrated ammoniacal copper zinc arsenate (ACZA) solution, prepared by air-oxidation of trivalent arsenic.
Formerly under the jurisdiction of Committee D07 on Wood, this test method was withdrawn without replacement in July 2006.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D3873–01
Standard Test Method for
Valency State of the Arsenic Component of Ammoniacal
1
Copper Zinc Arsenate Solutions
This standard is issued under the fixed designation D 3873; 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. Reagents
1.1 This test method is intended for testing batches of 5.1 Purity of Reagents—Reagent grade chemicals shall be
concentrated ammoniacal copper zinc arsenate (ACZA) solu- used in all tests. Unless otherwise indicated, it is intended that
tion, prepared by air-oxidation of trivalent arsenic. The test all reagents shall conform to the specifications of the Commit-
methodprovidesameansofconfirmingthatoxidationhasbeen tee onAnalytical Reagents of theAmerican Chemical Society,
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completed and that at least 99.5 % of the arsenic has been where such specifications are available. Other grades may be
oxidized. The sample for testing should contain 100 6 20 mg used, provided it is first ascertained that the reagent is of
of potentialAs O .A200-mLaliquot of a concentrate contain- sufficiently high purity to permit its use without lessening the
2 5
ing 8 to 12 % of preservative oxides is suitable. accuracy of the determination.
1.2 This standard does not purport to address all of the 5.2 Purity of Water—Unless otherwise indicated, references
safety concerns, if any, associated with its use. It is the to water shall be understood to mean reagent water as defined
responsibility of the user of this standard to establish appro- in Specification D 1193.
priate safety and health practices and determine the applica- 5.3 Iodine Solution—Add 6.3 to 6.4 g of resublimed iodine
bility of regulatory limitations prior to use. to a 500-mLstandard flask.Add 10 to 12 g of potassium iodide
and not more than approximately 20 mL of water. Swirl the
2. Referenced Documents
contentsoftheflaskatroomtemperatureuntilalltheiodinehas
2.1 ASTM Standards:
dissolved, and dilute to the graduation mark. This solution can
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D 1193 Specification for Reagent Water be kept for a few weeks if stored in a tightly sealed,
3
D 1325 Specification for ACA and ACZA Solutions
glass-stoppered, dark bottle in a cool place.
5.4 Sodium Bicarbonate Solution, Saturated—Add 45 g of
3. Summary of Test Method
sodium bicarbonate to 400 mLof water, and swirl occasionally
3.1 Twenty millilitres of tartaric acid solution is added to a
until most of the sodium bicarbonate goes into solution. Do not
250 mLErlenmeyer flask, then 2 mLof theACZAconcentrate
use heat to dissolve the salt. This solution can be kept in a
is added. The resulting solution should be light blue-green.
stoppered flask.
Next, 20 mL of sodium bicarbonate solution is added. The
5.5 Starch Indicator Solution—Make a paste of approxi-
resulting solution will then be light blue. Next, 2 ml of the
mately 1.0 g of soluble starch in 5 mL of water. Pour the paste
starch indicator is added. To this solution one drop of iodine
into 200 mL of water, near the boiling point, and then boil for
solution is added by means of a buret. If the concentrate
1 min. When the solution has cooled, add a few drops of
solution turns a dark blue and remains, it means the arsenic
chloroform as a preservative and keep in a stoppered bottle.
oxidation by aeration has been completed.
Some batches of starch will not dissolve properly. If the
solutionseparatesintotwolayers,usetheclear,toplayer.Ifthe
4. Significance and Use
whole solution is cloudy, prepare a fresh solution, or obtain a
4.1 Thistestmethodtestsforthecompletionofoxidationby
different supply of starch.
aeration which converts trivalent arsenic to pentavalent ar-
5.6 TartaricAcid Solution—Dissolve 27 g of tartaric acid in
senic.
400 mL of water.
1
This test method is under the jurisdiction of ASTM Committee D07 on Wood
and is the direct responsibility of Subcommittee D07.06 on Treatments for Wood
Products.
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Current edition approved April 10, 2001. Published June 2001. Originally “Reagent Chemicals,American Chemical Society Specifications,”Am. Chemi-
published as D 3873 – 79. Last previous edition D 3873 – 95. cal Soc., Washington, DC. For suggestions on the testing of reagents not listed by
2
Annual Book of ASTM Standards, Vol 11.01. theAmerican Chemical Society, see “Reagent Chemicals and Standards,” by Joseph
3
Annual Book of ASTM Standards, Vol 04.10. Rosin, D.Van Nostrand Co., NewYork, NY, and the “United States Pharmacopeia.”
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D3873
6. Procedure 6.5 A
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