ASTM D1832-87(1999)
(Test Method)Standard Test Method for Peroxide Number of Petroleum Wax
Standard Test Method for Peroxide Number of Petroleum Wax
SCOPE
1.1 This test method covers the determination of the peroxide number of petroleum wax.
1.2 This standard does not purport to address all of the safety problems, 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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An American National Standard
Designation:D1832–87(Reapproved1999) Technical Association of Pulp
and Paper Industry Standard Method T 659 su-67
Standard Test Method for
Peroxide Number of Petroleum Wax
This standard is issued under the fixed designation D 1832; 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 where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
1.1 This test method covers the determination of the perox-
sufficiently high purity to permit its use without lessening the
ide number of petroleum wax.
accuracy of the determination.
1.2 This standard does not purport to address all of the
6.2 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 distilled water or water of
responsibility of the user of this standard to establish appro-
equal purity.
priate safety and health practices and determine the applica-
6.3 Acetic Acid Solution—Mix 4 mLof concentrated hydro-
bility of regulatory limitations prior to use.
chloric acid (HCl, sp gr 1.19) with 996 mL of ACS special
2. Terminology reagent grade glacial acetic acid (CH CO H). The acetic acid
3 2
must pass the ⁄2 h test for substances reducing K Cr O .
2.1 Definition: 2 2 7
6.4 Carbon Tetrachloride (CCl ).
2.1.1 peroxide number—the milliequivalents of constituents
6.5 Potassium Dichromate, Standard Solution (0.1 N)—
per 1000 g of wax that will oxidize potassium iodide.
Recrystallize potassium dichromate (K Cr O ) twice from an
2 2 7
3. Summary of Test Method
aqueous solution and dry at about 325°F (164°C) to constant
weight. Dissolve 2.452 g of the purified K Cr O in water and
3.1 Aquantity of sample is dissolved in carbon tetrachloride 2 2 7
dilute to 500 mL in a volumetric flask.
and acidified with acetic acid solution.Asolution of potassium
6.6 Potassium Dichromate, Standard Solution (0.01 N)—
iodide is added and, after a reaction period, the solution is
Dilute 100 mL of 0.1 N K Cr O solution with water to 1000
titrated with sodium thiosulfate solution to the end point 2 2 7
mL in a volumetric flask.
indicated by the color change of added starch solution.
6.7 Potassium Iodide Solution—Dissolve 120 g of potas-
4. Significance and Use
sium iodide (KI) in 100 mLof water. Discharge any color from
this solution as follows: put 1 mL of KI solution, 50 mL of
4.1 The magnitude of the peroxide number is an indication
water, and 5 mL of starch solution in a 300-mL flask and
of the quantity of oxidizing constituents present. Deterioration
blanket with nitrogen or carbon dioxide. If a blue color
of petroleum wax results in the formation of peroxides and
develops, add 0.005 N Na S O solution from a microburet
other oxygen-carrying compounds. The peroxide number mea-
2 2 3
until color just disappears. Calculate and add sufficient
sures those compounds that will oxidize potassium iodide.
Na S O solution to the main KI solution to convert all free
2 2 3
5. Apparatus
iodine to iodide. When starch solution is added to 1 mL of KI
solution a blue color should not develop, but upon the addition
5.1 Iodine Flask, borosilicate glass, 250-mLcapacity, glass-
of 1 drop of 0.01 N K Cr O solution and 2 drops of
stoppered.
2 2 7
concentrated hydrochloric acid (HCl, sp gr 1.19), a blue color
6. Reagents and Materials
shoulddevelop.Storethissolutionunderchloroformbyadding
6.1 Purity of Reagents—Reagent grade chemicals shall be a few millilitres to the surface of the liquid.
6.8 Sodium Thiosulfate, Standard Solution (0.1 N)—
used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit- Dissolve 12.5 g of sodium thiosulfate (Na S O ·5H O) and 0.1
2 2 3 2
g of sodium carbonate (Na CO ) in 500 mLof water. Let stand
tee on Analytical Reagents of the American Chemical Society,
2 3
Reagent Chemicals, American Chemical Society Specifications, American
This test method is under the jurisdiction of the ASTM Committee D-2 on
Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Petroleum Products and Lubricants and is the direct responsibility of Subcommittee
listed by the American Chemical Society, see Analar Standards for Laboratory
D02.10 on Properties of Petroleum Wax.
Chemicals, BDH Ltd., Poole, Dorset, U. K., and the United States Pharmacopeia
Current edition approv
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