ASTM D3125-97
(Test Method)Standard Test Method for Monomethyl Ether of Hydroquinone in Colorless Monomeric Acrylate Esters and Acrylic Acid
Standard Test Method for Monomethyl Ether of Hydroquinone in Colorless Monomeric Acrylate Esters and Acrylic Acid
SCOPE
1.1 This test method covers the determination of monomethyl ether of hydroquinone (MEHQ) in colorless monomeric acrylate esters and acrylic acid. The test method is applicable to the determination of MEHQ in the concentration range from 0 to 1200 parts per million.
1.2 For hazard information and guidance, see the supplier's Material Safety Data Sheet.
1.3 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. Specific precautionary statements are given in Section 8.
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Designation: D 3125 – 97
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Monomethyl Ether of Hydroquinone in Colorless Monomeric
Acrylate Esters and Acrylic Acid
This standard is issued under the fixed designation D 3125; 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 MEHQ only. This procedure presents a rapid and accurate
method of determining the MEHQ content of fresh acrylic acid
1.1 This test method covers the determination of monom-
and acrylate esters in the absence of other inhibitors.
ethyl ether of hydroquinone (MEHQ) in colorless monomeric
4.2 MEHQ effectiveness may decline with age and this
acrylate esters and acrylic acid. The test method is applicable
decline in effectiveness may not be indicated by this test
to the determination of MEHQ in the concentration range from
method.
0 to 1200 parts per million.
1.2 For hazard information and guidance, see the supplier’s
5. Interferences
Material Safety Data Sheet.
5.1 Hydroquinone (HQ), thiodiphenylamine, diphenylphe-
1.3 This standard does not purport to address all of the
nylene-diamine and p-hydroxydiphenylamine interfere if
safety concerns, if any, associated with its use. It is the
present.
responsibility of whoever uses this standard to consult and
establish appropriate safety and health practices and deter-
6. Apparatus
mine the applicability of regulatory limitations prior to use.
6.1 Spectrophotometer, with borosilicate-glass cells for de-
Specific precautionary statements are given in Section 8.
termining absorbance at 420 nm.
6.2 Volumetric Flasks, 50 and 100-mL capacity.
2. Referenced Documents
6.3 Measuring Pipets, 5 and 10-mL capacity.
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
7. Reagents
E 180 Practice for Determining the Precision of ASTM
4 7.1 Purity of Reagents—Reagent grade chemicals shall be
Methods for Analysis and Testing of Industrial Chemicals
used. Unless otherwise indicated, it is intended that all reagents
3. Summary of Test Method shall conform to the specifications of the Committee on
Analytical Reagents of the American Chemical Society where
3.1 As shown in the equation, MEHQ reacts with nitrous
such specifications are available. Other grades may be used,
acid (sodium nitrite in acidic media) to form the nitroso
provided it is first ascertained that the reagent is of sufficiently
derivative which equilibrates between two structures.
high purity to permit its use without lessening the accuracy of
the determination.
7.2 Purity of Water—Unless otherwise indicated, references
to water shall be understood to mean reagent grade water
conforming to Type IV of Specification D 1193.
7.3 Acetic Acid, glacial.
7.4 Monomethyl Ether of Hydroquinone (MEHQ) (4-
3.2 The yellow color of the nitroso compound is measured
methoxyphenol).
spectrophotometrically at a wavelength of 420 nm.
7.5 Sodium Nitrite Solution (2 %)—Dissolve2gof sodium
nitrite (NaNO ) in water and dilute to 100 mL.
4. Significance and Use
8. Hazards
4.1 Acrylic acid and its esters are normally inhibited with
8.1 Store samples of acrylic monomers in amber bottles or
This test method is under the jurisdiction of ASTM Committee D-1 on Paint
and Related Coatings, Materials, and Applications and is the direct responsibility of
Subcommittee D01.35 on Solvents, Plasticizers, and Chemical Intermediates. Reagent Chemicals, American Chemical Society Specifications, American
Current edition approved June 10, 1997. Published September 1997. Originally Chemical Society, Washington, DC. For suggestions on the testing of reagents not
published as D 3125 – 72. Last previous edition D 3125 – 93. listed by the American Chemical Society, see Analar Standards for Laboratory
IUPAC-approved name is 4-methoxyphenol. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Annual Book of ASTM Standards, Vol 11.01. and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
Annual Book of ASTM Standards, Vol 15.05. MD.
D 3125
MEHQ, ppm 5 M/S (1)
protect from light by other means to aid in preventing
polymerization. Keep samples away from heat sources and
where:
chemicals that can cause free radical polymerization. Acrylic
M 5 micrograms of MEHQ from calibration curve and
monomers can polymerize violently, evolving considerable
S 5 grams of specimen used in the test.
heat. Keep sample container size to a minimum. The inhibitor,
monomethyl/ester of hydroquinone,
...
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