ASTM D1686-96(2000)
(Test Method)Standard Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt Scale)
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.
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Designation: D 1686 – 96 (Reapproved 2000)
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 3. Significance and Use
1.1 This test method covers the visual measurement of the 3.1 Color by this test method is a measure of color-
color of thermally stable solids melting below 150°C. It is producing impurities present in the thermally stable solids.
applicable only to materials in which the color-producing This test method is suitable for setting specifications and for
bodies present have light absorption characteristics quite simi- use as an internal quality control tool.
lar to those of the standards used.
4. Apparatus
1.2 The following applies to all specified limits in this test
method: for purposes of determining conformance with this 4.1 Color Comparison Tubes—Matched 100-mL, tall-form
Nessler tubes, provided with ground-on, optically clear, glass
test method, an observed value or a calculated value shall be
rounded off “to the nearest unit” in the last right-hand digit caps. Tubes should be selected so that the height of the 100-mL
graduation mark is 300 6 3 mm above the bottom of the tube.
used in expressing the specification limit, in accordance with
the rounding-off method of Practice E 29. The use of heat-resistant tubes is preferred for safety reasons.
4.2 Color Comparator—A color comparator constructed to
1.3 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the permit visual comparison of light transmitted through tall-
form, 100-mL Nessler tubes in the direction of their longitu-
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- dinal axes. The comparator should be constructed so that white
light is reflected off a white plate and directed with equal
bility of regulatory limitations prior to use. For specific hazard
statements see Sections 7 and 9. intensity through the tubes, and should be shielded so that no
light enters the tubes from the side.
2. Referenced Documents
4.3 Oven—An oven, preferably of the forced draft type and
2.1 ASTM Standards: capable of maintaining a constant temperature 61°C in the
D 1193 Specification for Reagent Water range up to 150°C. Alternatively, the use of an aluminum
D 3438 Practice for Sampling and Handling Naphthalene, heating block provided with proper temperature control or
Maleic Anhydride, and Phthalic Anhydride other similar equipment is permissible.
D 3852 Practice for Sampling and Handling Phenol and
3 5. Reagents
Cresylic Acid
5.1 Purity of Reagents—Reagent grade chemicals shall be
E 29 Practice for Using Significant Digits in Test Data to
Determine Conformance with Specifications used in all tests. Unless otherwise indicated, it is intended that
all reagents shall conform to the specifications of the Commit-
2.2 Other Document:
OSHA Regulations, 29 CFR, paragraphs 1910.1000 and tee on Analytical Reagents of the American Chemical Society,
5 6
where such specifications are available. Other grades may be
1910.1200
used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
This test method is under the jurisdiction of ASTM Committee D16 on
accuracy of the determination.
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
Subcommittee D16.02 on Oxygenated Aromatics.
Current edition approved Jan. 10, 1996. Published March 1996. Originally
published as D 1686 – 59 T. Last previous edition D 1686 – 95. Reagent Chemicals, American Chemical Society Specifications, American
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. Pharmacopeial Convention, Inc. (USPC), Rockville,
Office, Washington, DC 20402. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1686
5.2 Purity of Water—Unless otherwise indicated, references 9.2 As soon as the sample is completely liquid, mix by
to water shall be understood to mean Type IV reagent water stirring with a clean dry glass rod, then quickly fill the
conforming to Specification D 1193. preheated Nessler tube to the 100-mL mark with the sample
5.3 Cobalt Chloride (CoCl ·6H O). and cap the tube. Place the tube in the comparator and
2 2
5.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro- immediately compare with the standards.
chloric acid (HCl).
NOTE 1—A variation of more than 2 to 3 mm in depth can aff
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