ASTM D1686-96

Standard Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt Scale)

SCOPE
1.1 This test method covers the visual measurement of the color of thermally stable solids melting below 150oC. It is applicable only to materials in which the color-producing bodies present have light absorption characteristics quite similar to those of the standards used.
1.2 The following applies to all specified limits in this test method: for purposes of determining conformance with this test method, an observed value or a calculated value shall be rounded off "to the nearest unit" in the last right-hand digit used in expressing the specification limit, in accordance with the rounding-off method of Practice E29.  
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. For specific hazard statements see Sections 7 and 9.

General Information

• Status: Historical
• Publication Date: 31-Dec-1999
• Technical Committee: D16 - Aromatic, Industrial, Specialty and Related Chemicals
• Drafting Committee: D16.02 - Oxygenated Aromatics

Relations

• Replaced By: ASTM D1686-96(2000) - Standard Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt Scale)
• Effective Date: 01-Jan-2000
• Referred By: ASTM D2439-20 - Standard Specification for Refined Phenol
• Effective Date: 01-Jan-2000
• Referred By: ASTM D3366-18 - Standard Test Method for Color of Maleic Anhydride in the Molten State and After Heating (Platinum-Cobalt Scale)
• Effective Date: 01-Jan-2000
• Referred By: ASTM D8005-23 - Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)
• Effective Date: 01-Jan-2000
• Referred By: ASTM D8087-18 - Standard Test Method for Color of Maleic Anhydride in the Molten State and After Heating (Platinum-Cobalt Scale) Using Tristimulus Colorimetry
• Effective Date: 01-Jan-2000
• Referred By: ASTM D5386-16 - Standard Test Method for Color of Liquids Using Tristimulus Colorimetry
• Effective Date: 01-Jan-2000

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 1686 – 96
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
Color of Solid Aromatic Hydrocarbons and Related Materials
in the Molten State (Platinum-Cobalt Scale)
This standard is issued under the fixed designation D 1686; 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 This test method is suitable for setting specifications and for
use as an internal quality control tool.
1.1 This test method covers the visual measurement of the
color of thermally stable solids melting below 150°C. It is
4. Apparatus
applicable only to materials in which the color-producing
4.1 Color Comparison Tubes—Matched 100-mL, tall-form
bodies present have light absorption characteristics quite simi-
Nessler tubes, provided with ground-on, optically clear, glass
lar to those of the standards used.
caps. Tubes should be selected so that the height of the 100-mL
1.2 The following applies to all specified limits in this test
graduation mark is 300 6 3 mm above the bottom of the tube.
method: for purposes of determining conformance with this
The use of heat-resistant tubes is preferred for safety reasons.
test method, an observed value or a calculated value shall be
4.2 Color Comparator—A color comparator constructed to
rounded off “to the nearest unit” in the last right-hand digit
permit visual comparison of light transmitted through tall-
used in expressing the specification limit, in accordance with
form, 100-mL Nessler tubes in the direction of their longitu-
the rounding-off method of Practice E 29.
dinal axes. The comparator should be constructed so that white
1.3 This standard does not purport to address all of the
light is reflected off a white plate and directed with equal
safety concerns, if any, associated with its use. It is the
intensity through the tubes, and should be shielded so that no
responsibility of the user of this standard to establish appro-
light enters the tubes from the side.
priate safety and health practices and determine the applica-
4.3 Oven—An oven, preferably of the forced draft type and
bility of regulatory limitations prior to use. For specific hazard
capable of maintaining a constant temperature 61°C in the
statements see Sections 7 and 9.
range up to 150°C. Alternatively, the use of an aluminum
2. Referenced Documents heating block provided with proper temperature control or
other similar equipment is permissible.
2.1 ASTM Standards:
D 1193 Specification for Reagent Water
5. Reagents
D 3438 Practice for Sampling and Handling Naphthalene,
3 5.1 Purity of Reagents—Reagent grade chemicals shall be
Maleic Anhydride, and Phthalic Anhydride
used in all tests. Unless otherwise indicated, it is intended that
D 3852 Practice for Sampling and Handling Phenol and
3 all reagents shall conform to the specifications of the Commit-
Cresylic Acid
tee on Analytical Reagents of the American Chemical Society,
E 29 Practice for Using Significant Digits in Test Data to
4 where such specifications are available. Other grades may be
Determine Conformance with Specifications
used, provided it is first ascertained that the reagent is of
2.2 Other Document:
sufficiently high purity to permit its use without lessening the
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and
5 accuracy of the determination.
1910.1200
5.2 Purity of Water—Unless otherwise indicated, references
3. Significance and Use to water shall be understood to mean Type IV reagent water
conforming to Specification D 1193.
3.1 Color by this test method is a measure of color-
5.3 Cobalt Chloride (CoCl ·6H O).
producing impurities present in the thermally stable solids. 2 2
5.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro-
chloric acid (HCl).
This test method is under the jurisdiction of ASTM Committee D-16 on
5.5 Potassium Chloroplatinate (K PtCl ).
2 6
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.0C on Oxygenated Aromatics.
Current edition approved Jan. 10, 1996. Published March 1996. Originally
Reagent Chemicals, American Chemical Society Specifications, American
published as D 1686 – 59 T. Last previous edition D 1686 – 95.
Annual Book of ASTM Standards, Vol 11.01. Chemical Society, Washington, DC. For suggestions on the testing of reagents not
Annual Book of ASTM Standards, Vol 06.04. listed by the American Chemical Society, see Analar Standards for Laboratory
Annual Book of ASTM Standards, Vol 14.02. Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
Available from Superintendent of Documents, U.S. Government Printing and National Formulary, U.S. Pharmaceutical Convention, Inc. (USPC), Rockville,
Office, Washington, DC 20402. MD.
D 1686
6. Standards and cap the tube. Place the tube in the comparator and
immediately compare with the stand
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