ASTM D4789-94
(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)
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.
General Information
Relations
Standards Content (Sample)
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 4789 – 94
Standard Test Method for
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 A bisphenol A color that is off-hue, or tinted with respect
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-
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
caps. Tubes should be selected so that the height of the 100-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 Chemicals
2.2 Other Documents: 6.2 Color Comparator, constructed to permit visual com-
parison of light transmitted through tall-form, 100 mL Nessler
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
1910.1200 tubes in the direction of their longitudinal axis; and so that
white light is passed through or reflected off a white glass plate
NIST Letter Circular LC 1017, Standard for Checking the
Calibration of Spectrophotometers (200 to 1000 nm) and directed with equal intensity through the tubes. It should be
shielded so that no light enters the tubes from the sides.
3. Summary of Test Method
6.3 Spectrophotometer, equipped for liquid samples and for
3.1 Bisphenol A is dissolved in methanol. This solution is measurements in the visible region.
then transferred to a color comparison tube and the color
NOTE 1—The spectrophotometer must be clean and in excellent oper-
compared to that of the Platinum-Cobalt Color Standards,
ating condition. The instrument should be calibrated in accordance with
either visually or by means of a spectrophotometer. The color
the instructions given in NIST Letter Circular LC 1017. For good
is reported as that closest to the applicable standard. agreement with the visual method, the spectrophotometer or colorimeter
should be a filter type instrument.
6.4 Spectrophotometer Cells, cells of different path lengths
may be used as long as the equipment is calibrated with the
1 same length cells as the sample solution.
This test method is under the jurisdiction of ASTM Committee D-16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of 6.5 Filter Paper, glass fiber filter, 1.2-μm pore retention.
Subcommittee D16.0C on Oxygenated Aromatics.
Current edition approved April 15, 1994. Published June 1994. Originally
7. Reagents
published as D 4789 – 88. Last previous edition D 4789 – 88.
7.1 Purity of Reagents—Reagent grade chemicals shall be
Annual Book of ASTM Standards, Vol 06.04.
Annual Book of ASTM Standards, Vol 15.05. used in all tests. Unless otherwise indicated, it is intended that
Available from Superintendent of Documents, U.S. Government Printing
Office, Washington, DC 20402.
5 6
Available from National Institute of Standards and Technology, U.S. Depart- Beckman Model B, available from Beckman Instruments, 41365 Vincenti Ct.,
ment of Commerce, Gaithersburg, MD 20899. Novi, MI 48050, or its equivalent, has been found to be satisfactory for this purpose.
Copyright © ASTM, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
D 4789
NOTE 2—Caution: Use of a spectrophotometer may provide values
all reagents shall conform to the specifications of the Commit-
which are higher or inconsistent with those
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.