ASTM D2108-10
(Test Method)Standard Test Method for Color of Halogenated Organic Solvents and Their Admixtures (Platinum-Cobalt Scale)
Standard Test Method for Color of Halogenated Organic Solvents and Their Admixtures (Platinum-Cobalt Scale)
SIGNIFICANCE AND USE
Color may be indicative of the quality of the solvent because any color present is due to the presence of contaminants.
SCOPE
1.1 This test method covers the visual measurement of the color of halogenated organic solvents and their admixtures. It is valid for values of 50 platinum-cobalt (Pt-Co) units or less.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.
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Designation: D2108 − 10
StandardTest 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.
subjectivity out of the measurement. These instruments may be calibrated
1. Scope
with the platinum-cobalt color standards listed in Table 1 at 455 mm or
1.1 This test method covers the visual measurement of the
withopticallystandardizedcolorfilterdiskssuchasthoseavailableforthe
color of halogenated organic solvents and their admixtures. It Hellige Aqua Tester. Many of these instruments take the measurement
across a relatively narrow range of wave lengths, and their readings may
is valid for values of 50 platinum-cobalt (Pt-Co) units or less.
be in error if the color of the sample is significantly different from the
1.2 The values stated in SI units are to be regarded as
amber color of the color standards.
standard. No other units of measurement are included in this
standard. 4. Reagents
1.3 This standard does not purport to address all of the
4.1 Purity of Reagents—Reagent grade chemicals shall be
safety concerns, if any, associated with its use. It is the
used in all tests. Unless otherwise indicated, it is intended that
responsibility of the user of this standard to establish appro-
all reagents shall conform to the specifications of the Commit-
priate safety and health practices and determine the applica-
tee onAnalytical Reagents of theAmerican Chemical Society,
2
bility of regulatory limitations prior to use.
where such specifications are available. Other grades may be
used, provided it is first ascertained that the reagent is of
2. Significance and Use
sufficiently high purity to permit its use without lessening the
2.1 Color may be indicative of the quality of the solvent accuracy of the determination.
because any color present is due to the presence of contami-
4.2 Purity of Water—Unless otherwise indicated, references
nants.
to water shall be understood to mean distilled water or water of
equal purity.
3. Apparatus
4.3 Cobaltous Chloride— (CoCl ·6H O).
2 2
3.1 Color Comparison Tubes—Matched 50 or 100-mL,
tall-form Nessler tubes, provided with ground-on, optically 4.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydro-
chloric acid (HCl).
clear, glass caps.
3.2 Color Comparator—A color comparator constructed to 4.5 Potassium Chloroplatinate —(K PtCl ).
2 6
permit visual comparison of light transmitted through tall-
5. Preparation of Color Standards
form, Nessler tubes in the direction of their longitudinal axes.
The comparator should be constructed so that white light is
5.1 Platinum-Cobalt Stock Solution—Dissolve 1.245 g of
passed through or reflected off a white glass plate and directed
K PtCl and 1.000 g of CoCl ·6H O in water.Add 100 mLof
2 6 2 2
with equal intensity through the tubes and should be shielded
HCl (sp gr 1.19) and dilute to 1 Lwith water. This solution has
so that no light enters the tubes from the side.
a color of 500.
3.3 Digital Color Instrument—Digital color instruments are
NOTE 2—Stock solutions of Pt-Co 500 color may be purchased from
available that measure color digitally and convert the result to
reagent supply houses. The stock solution should be certified reagent or
a numerical value using the Platinum-Cobalt scale. Many verified by the user as being correct.
manufacturers market instruments of this type.
5.2 Platinum-Cobalt Standards—For 100-mLNessler tubes,
NOTE 1—There are numerous colorimeters and comparators commer-
prepare color standards as given in Table 1. Dilute the required
cially available that measure the color of liquids and take some of 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 Feb. 1, 2010. Published March 2010. Originally Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia
approved in 1962. Last previous edition approved in 2005 as D2108 – 05. DOI: and National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,
10.1520/D2108-10. MD.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D2108–05 Designation:D2108–10
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.
1. Scope
1.1 This test method covers the visual measurement of the color of halogenated organic solvents and their admixtures. It is valid
for values of 50 platinum-cobalt (Pt-Co) units or less.
1.2
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
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.
2. Significance and Use
2.1 Color may be indicative of the quality of the solvent because any color present is due to the presence of contaminants.
3. Apparatus
3.1 Color Comparison Tubes—Matched 50 or 100-mL, tall-form Nessler tubes, provided with ground-on, optically clear, glass
caps.
3.2 Color Comparator—A color comparator constructed to permit visual comparison of light transmitted through tall-form,
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.
3.3 Digital Color Instrument—Digital color instruments are available that measure color digitally and convert the result to a
numerical value using the Platinum-Cobalt scale. Many manufacturers market instruments of this type.
NOTE 1—There are numerous colorimeters and comparators commercially available that measure the color of liquids and take some of the subjectivity
out of the measurement. These instruments may be calibrated with the platinum-cobalt color standards listed in Table 1 at 455 mm or with optically
standardized color filter disks such as those available for the Hellige Aqua Tester. Many of these instruments take the measurement across a relatively
narrow range of wave lengths, and their readings may be in error if the color of the sample is significantly different from the amber color of the color
standards.
4. Reagents
4.1 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
2
such specifications are available. Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high
purity to permit its use without lessening the accuracy of the determination.
4.2 Purity of Water—Unless otherwise indicated, references to water shall be understood to mean distilled water or water of
equal purity.
4.3 Cobaltous Chloride —(CoCl ·6H O).
2 2
4.4 Hydrochloric Acid (sp gr 1.19)—Concentrated hydrochloric acid (HCl).
1
This test method is under the jurisdiction of ASTM Committee D26 on Halogenated Organic Solvents and Fire Extinguishing Agents and is the direct responsibility of
Subcommittee D26.04 on Test Methods.
Current edition approved JuneFeb. 1, 2005.2010. Published June 2005.March 2010. Originally approved in 1962. Last previous edition approved in 20012005 as
D2108–97(2001).D2108 – 05. DOI: 10.1520/D2108-05.
2
Reagent Chemicals, American Chemical Society Specifications , 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.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2108–10
TABLE 1 Platinum-Cobalt Color Standards
Color Stock Color Stock
Standard Solution, Standard Solution,
Nu
...
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