ASTM D4789-03
(Test Method)Standard Test Method for Solution Color of Bisphenol A (4,4´-Isopropylidenediphenol)
Standard Test Method for Solution Color of Bisphenol A (4,4´-Isopropylidenediphenol)
SIGNIFICANCE AND USE
Color is caused by impurities in the bisphenol A. The acceptable amount of color depends on the end-use of the bisphenol A.
This test method can be used for internal quality control or for setting specifications.
SCOPE
1.1 This test method describes the procedure for determination of the Platinum-Cobalt Color of 4,4`-Isopropylidenediphenol, commercially known as bisphenol A, dissolved in methanol.
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. For a specific hazard statement, see Section 8.
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Designation: D 4789 – 03
Standard Test Method for
1
Solution Color of Bisphenol A (4,4*-Isopropylidenediphenol)
This standard is issued under the fixed designation D 4789; 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 4. Significance and Use
1.1 This test method describes the procedure for determina- 4.1 Color is caused by impurities in the bisphenol A. The
tion of the Platinum-Cobalt Color of 4,48- acceptable amount of color depends on the end-use of the
Isopropylidenediphenol, commercially known as bisphenol A, bisphenol A.
dissolved in methanol. 4.2 This test method can be used for internal quality control
1.2 This standard does not purport to address all of the or for setting specifications.
safety concerns, if any, associated with its use. It is the
5. Interferences
responsibility of the user of this standard to establish appro-
5.1 The presence of any turbidity or haze will affect the
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. For a specific color reading.
5.2 AbisphenolAcolorthatisoff-hue,ortintedwithrespect
hazard statement, see Section 8.
to the color standards, may interfere with proper color com-
2. Referenced Documents
parison.
2.1 ASTM Standards:
6. Apparatus
D 1209 Test Method for Color of Clear Liquids (Platinum-
2
6.1 Color Comparison Tubes—Matched 100 mL, tall-form
Cobalt Scale)
D 4297 Practice for Sampling and Handling 4,48- Nessler tubes, provided with ground-on, optically clear, glass
2
caps.Tubesshouldbeselectedsothattheheightofthe100-mL
Isopropylidenediphenol (Bisphenol A)
E 180 Practice for Determining the Precision of ASTM graduation mark is 275 to 295 mm above the bottom of the
tube.
Methods for Analysis and Testing of Industrial and Spe-
3
cialty Chemicals 6.2 Color Comparator, constructed to permit visual com-
2.2 Other Documents: parison of light transmitted through tall-form, 100 mL Nessler
tubes in the direction of their longitudinal axis; and so that
OSHA Regulations,29 CFR, paragraphs 1910.1000 and
4
1910.1200 white light is passed through or reflected off a white glass plate
anddirectedwithequalintensitythroughthetubes.Itshouldbe
NIST Letter Circular LC 1017, Standard for Checking the
5
Calibration of Spectrophotometers (200 to 1000 nm) shielded so that no light enters the tubes from the sides.
6.3 Spectrophotometer, equipped for liquid samples and for
3. Summary of Test Method
measurements in the visible region.
3.1 Bisphenol A is dissolved in methanol. This solution is
NOTE 1—The spectrophotometer must be clean and in excellent oper-
then transferred to a color comparison tube and the color
ating condition. The instrument should be calibrated in accordance with
compared to that of the Platinum-Cobalt Color Standards,
the instructions given in NIST Letter Circular LC 1017. For good
either visually or by means of a spectrophotometer. The color agreement with the visual method, the spectrophotometer or colorimeter
should be a filter type instrument.
is reported as that closest to the applicable standard.
6.4 Spectrophotometer Cells, cells of different path lengths
1 may be used as long as the equipment is calibrated with the
This test method is under the jurisdiction of ASTM Committee D16 on
same length cells as the sample solution.
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.02 on Oxygenated Aromatics.
6.5 Filter Paper, glass fiber filter, 1.2-µm pore retention.
Current edition approved Jan. 10, 2003. Published March 2003. Originally
approved in 1988. Last previous edition approved in 1994 as D 4789 – 94.
7. Reagents
2
Annual Book of ASTM Standards, Vol 06.04.
3
Annual Book of ASTM Standards, Vol 15.05. 7.1 Purity of Reagents—Reagent grade chemicals shall be
4
AvailablefromU.S.GovernmentPrintingOfficeSuperintendentofDocuments,
used in all tests. Unless otherwise indicated, it is intended that
732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401.
all reagents shall conform to the specifications of the Commit-
5
Available from National Institute of Standards and Technology (NIST), 100
tee onAnalytical Reagents of theAmerican Chemical Society,
Bureau Dr., Stop 3460, Gaithersburg, MD 20899-3460.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D4789–03
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where such specifications are available. Other grades may be 11. Report
used, provided it is first ascertained that the reagent is of
11.1 Report the following informa
...
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