ASTM D8005-23

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Designation: D8005 − 18 D8005 − 23
Standard Test Method for
Color of Clear Liquids (Platinum-Cobalt Scale)
This standard is issued under the fixed designation D8005; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope*
1.1 This test method covers a procedure for the visual measurement of the color of near clear liquids. It is applicable only to
materials in which the color-producing bodies present have light absorption characteristics nearly identical with those of the
Platinum-Cobalt (Pt-Co) color standards used.
1.2 This test method has been found applicable to the color measurement of clear, liquid samples, free of haze, with nominal Pt-Co
color values between 0 and 100. It is applicable to nonfluorescent liquids with light absorption characteristics similar to those of
the Pt-Co color standard solutions. Test Methods D1209, D1686, and D5386 deal with the visual and instrumental measurement
of near-clear liquids.
1.3 In determining the conformance of the test results using this method to applicable specifications, results shall be rounded in
accordance with the rounding off methods of Practice E29.
1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.5 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, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.6 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D1193 Specification for Reagent Water
D1209 Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)
D1686 Test Method for Color of Solid Aromatic Hydrocarbons and Related Materials in the Molten State (Platinum-Cobalt
Scale)
D3437 Practice for Sampling and Handling Liquid Cyclic Products
D5386 Test Method for Color of Liquids Using Tristimulus Colorimetry
D6809 Guide for Quality Control and Quality Assurance Procedures for Aromatic Hydrocarbons and Related Materials
This test method is under the jurisdiction of ASTM Committee D16 on Aromatic, Industrial, Specialty and Related Chemicals and is the direct responsibility of
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their Derivatives.
Current edition approved Feb. 1, 2018July 1, 2023. Published March 2018July 2023. Originally approved in 2015. Last previous edition approved in 20152018 as D8005
– 15. DOI: 10.1520/D8005-18.18. DOI: 10.1520/D8005-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
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D8005 − 23
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
2.2 Other Documents:
OSHA Regulations, 29 CFR paragraphs 1910.1000 and 1910.1200
3. Summary of Test Method
3.1 A specimen is placed in a Nessler tube and compared to a series of prepared Pt-Co standards.
4. Significance and Use
4.1 The major objective of the visual Pt-Co method of color measurement is to rate specific materials for yellowness. The
yellowness is frequently the result of the undesirable tendency of liquid hydrocarbons to absorb blue light due to contamination
in processing, storage, or shipping.
5. Apparatus
5.1 Spectrophotometer, equipped for liquid samples and for measurements in the visible region.
5.1.1 The spectrophotometer used must be clean and in first-class operating condition. The instrument should be calibrated in
accordance with the instructions in the Standards for Checking and Calibration of Spectrophotometers (200(200 cm to 1000 cm).
5.2 Spectrophotometer Cells, matched having a 10-mm10 mm light path.
5.3 Color Comparison Tubes—Matched 100-mL,100 mL, tall-form Nessler tubes, provided with ground-on, optically clear, glass
caps. Tubes should be selected so that the height of the 100-mL100 mL graduation mark is 275275 mm to 295 mm above the
bottom of the tube.
5.4 Color Comparator—A color comparator constructed to permit visual comparison of light transmitted through tall-form
100-mL100 mL Nessler tubes in the direction of their longitudinal axes. The comparator should be constructed so that white light
is passed through or reflected off a white glass plate and directed with equal intensity through the tubes, and should be shielded
so that no light enters the tubes from the side.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical Society, where
such specifications are available. Other grades may be used, provided it is first ascertained that the agent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
TABLE 1 Absorbance Tolerance Limits for No. 500 Platinum-
Cobalt Stock Solution
Wavelength, nm Absorbance
430 0.100 to 0.120
455 0.130 to 0.145
480 0.105 to 0.120
510 0.055 to 0.065
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www.access.gpo.gov.
See NIST Circular LC-1017.
The sole source of supply of the apparatus known to the committee at this time is Scientific Glass and Instruments, Inc., P.O. Box 6, Houston, TX 77001. If you are
aware of alternative suppliers, please provide this information to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of the
responsible technical committee, which you may attend.
Reagent Chemicals, American Chemical Society Specifications,ACS Reagent Chemicals, Specifications and Procedures for Reagents and Standard-Grade Reference
Materials, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by the American Chemical Society, see Analar Standards for
Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC),
Rockville, MD.
D8005 − 23
6.2 Purity of Water—References to water shall be understood to mean reagent water conforming to Type IV I or II of Specification
D1193.
6.3 Cobalt Chloride (CoCl ·6H O).
2 2
6.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydrochloric acid (HCI).
6.5 Potassium Chloroplatinate (K PtCl ).).
2 6
6.6 Pt-Co Stock Solution—Dissolve 1.245 g of potassium chloroplatinate (K PtCl ) and 1.00 g of cobalt ch
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