ASTM D2108-05

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation:D2108–05
Standard Test Method for
Color of Halogenated Organic Solvents and
1
Their Admixtures (Platinum-Cobalt Scale)
This standard is issued under the fixed designation D2108; 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.
This standard has been approved for use by agencies of the Department of Defense.
with the platinum-cobalt color standards listed inTable 1 or with optically
1. Scope
standardized color filter disks such as those available for the HelligeAqua
1.1 This test method covers the visual measurement of the
Tester.Manyoftheseinstrumentstakethemeasurementacrossarelatively
color of halogenated organic solvents and their admixtures. It
narrow range of wave lengths, and their readings may be in error if the
is valid for values of 50 platinum-cobalt (Pt-Co) units or less.
color of the sample is significantly different from the amber color of the
1.2 This standard does not purport to address all of the color standards.
safety concerns, if any, associated with its use. It is the
4. Reagents
responsibility of the user of this standard to establish appro-
4.1 Purity of Reagents—Reagent grade chemicals shall be
priate safety and health practices and determine the applica-
used in all tests. Unless otherwise indicated, it is intended that
bility of regulatory limitations prior to use.
all reagents shall conform to the specifications of the Commit-
2. Significance and Use
tee onAnalytical Reagents of theAmerican Chemical Society,
2
where such specifications are available. Other grades may be
2.1 Color may be indicative of the quality of the solvent
because any color present is due to the presence of contami- used, provided it is first ascertained that the reagent is of
sufficiently high purity to permit its use without lessening the
nants.
accuracy of the determination.
3. Apparatus
4.2 Purity of Water—Unless otherwise indicated, references
3.1 Color Comparison Tubes—Matched 50 or 100-mL, to water shall be understood to mean distilled water or water of
tall-form Nessler tubes, provided with ground-on, optically equal purity.
clear, glass caps. 4.3 Cobaltous Chloride —(CoCl ·6H O).
2 2
3.2 Color Comparator—A color comparator constructed to 4.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro-
permit visual comparison of light transmitted through tall- chloric acid (HCl).
form, Nessler tubes in the direction of their longitudinal axes. 4.5 Potassium Chloroplatinate —(K PtCl ).
2 6
The comparator should be constructed so that white light is
5. Preparation of Color Standards
passed through or reflected off a white glass plate and directed
with equal intensity through the tubes and should be shielded 5.1 Platinum-Cobalt Stock Solution—Dissolve 1.245 g of
K PtCl and 1.000 g of CoCl ·6H O in water.Add 100 mLof
so that no light enters the tubes from the side.
2 6 2 2
3.3 Digital Color Instrument—Digital color instruments are HCl (sp gr 1.19) and dilute to 1 Lwith water. This solution has
a color of 500.
available that measure color digitally and convert the result to
a numerical value using the Platinum-Cobalt scale. Many
NOTE 2—Stock solutions of Pt-Co 500 color may be purchased from
manufacturers market instruments of this type.
reagent supply houses. The stock solution should be certified reagent or
verified by the user as being correct.
NOTE 1—There are numerous colorimeters and comparators commer-
cially available that measure the color of liquids and take some of the
5.2 Platinum-Cobalt Standards—For 100-mL Nessler
subjectivity out of the measurement. These instruments may be calibrated
tubes, prepare color standards as given in Table 1. Dilute the
1 2
This test method is under the jurisdiction of ASTM Committee D26 on Reagent Chemicals, American Chemical Society Specifications, American
Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct Chemical Society, Washington, DC. For suggestions on the testing of reagents not
responsibility of Subcommittee D26.04 on Test Methods. listed by the American Chemical Society, see Analar Standards for Laboratory
Current edition approved June 1, 2005. Published June 2005. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
approved in 1962. Last previous edition approved in 2001 as D2108 – 97(2001). and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
DOI: 10.1520/D2108-05. MD.
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D2108–05
TABLE 1 Platin
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