ASTM D8005-15
(Test Method)Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)
Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)
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.
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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D8005 − 15
Standard Test Method for
1
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 bons and Related Materials in the Molten State (Platinum-
Cobalt Scale)
1.1 This test method covers a procedure for the visual
D3437 Practice for Sampling and Handling Liquid Cyclic
measurement of the color of near clear liquids. It is applicable
Products
only to materials in which the color-producing bodies present
D5386 Test Method for Color of Liquids Using Tristimulus
have light absorption characteristics nearly identical with those
Colorimetry
of the Platinum-Cobalt (Pt-Co) color standards used.
D6809 Guide for Quality Control and Quality Assurance
1.2 This test method has been found applicable to the color
Procedures for Aromatic Hydrocarbons and Related Ma-
measurement of clear, liquid samples, free of haze, with
terials
nominal Pt-Co color values between 0 and 100. It is applicable
E29 Practice for Using Significant Digits in Test Data to
to nonfluorescent liquids with light absorption characteristics
Determine Conformance with Specifications
similar to those of the Pt-Co color standard solutions. Test
2.2 Other Documents:
Methods D1209, D1686, and D5386 deal with the visual and
OSHA Regulations, 29 CFR paragraphs 1910.1000 and
instrumental measurement of near-clear liquids. 3
1910.1200
1.3 In determining the conformance of the test results using
3. Summary of Test Method
this method to applicable specifications, results shall be
rounded in accordance with the rounding off methods of
3.1 Aspecimen is placed in a Nessler tube and compared to
Practice E29.
a series of prepared Pt-Co standards.
1.4 The values stated in SI units are to be regarded as
4. Significance and Use
standard. No other units of measurement are included in this
standard. 4.1 The major objective of the visual Pt-Co method of color
measurement is to rate specific materials for yellowness. The
1.5 This standard does not purport to address all of the
yellowness is frequently the result of the undesirable tendency
safety concerns, if any, associated with its use. It is the
of liquid hydrocarbons to absorb blue light due to contamina-
responsibility of the user of this standard to establish appro-
tion in processing, storage, or shipping.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use.
5. Apparatus
2. Referenced Documents 5.1 Spectrophotometer, equipped for liquid samples and for
measurements in the visible region.
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2.1 ASTM Standards:
5.1.1 The spectrophotometer used must be clean and in
D1193 Specification for Reagent Water
first-class operating condition. The instrument should be cali-
D1209 Test Method for Color of Clear Liquids (Platinum-
brated in accordance with the instructions in the Standards for
Cobalt Scale)
Checking and Calibration of Spectrophotometers (200 to 1000
D1686 Test Method for Color of Solid Aromatic Hydrocar-
4
cm).
5.2 Spectrophotometer Cells,matchedhavinga10-mmlight
path.
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This test method is under the jurisdiction of ASTM Committee D16 on
Aromatic Hydrocarbons and Related Chemicals and is the direct responsibility of
5.3 Color Comparison Tubes—Matched 100-mL, tall-form
Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane and Their
Nessler tubes, provided with ground-on, optically clear, glass
Derivatives.
Current edition approved June 1, 2015. Published June 2015. DOI: 10.1520/
D8005-15.
2 3
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contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM 732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http://
Standards volume information, refer to the standard’s Document Summary page on www.access.gpo.gov.
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the ASTM website. See NIST Circular LC-1017.
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D8005 − 15
TABLE 1 Absorbance Tolerance Limits for No. 500 Platinum-
6.5 Potassium Chloroplatinate (K PtCl ).
2 6
Cobalt Stock Solution
6.6 Pt-Co Stock Solution—Dissolve 1.245 g of potassium
Wavelength, nm Absorbance
chloroplatinate (K PtCl ) and 1.00 g of cobalt chloride
2 6
430 0.100 to 0.120
(CoCl ·6H O) in water. Carefully add 100 mL of hydrochloric
455 0.130 to 0.145 2 2
480 0.105 to 0.120 acid (HCl, sp gr. 1.19) and dilute to 1 L with wate
...
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