1、Designation: D2108 10 (Reapproved 2015)Standard Test Method forColor of Halogenated Organic Solvents and TheirAdmixtures (Platinum-Cobalt Scale)1This standard is issued under the fixed designation D2108; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the visual measurement of thecolor of halogenated organic sol
3、vents and their admixtures. Itis valid for values of 50 platinum-cobalt (Pt-Co) units or less.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to address all of thesafety concerns, if any, a
4、ssociated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Significance and Use2.1 Color may be indicative of the quality of the solventbecause any color
5、 present is due to the presence of contami-nants.3. Apparatus3.1 Color Comparison TubesMatched 50 or 100-mL,tall-form Nessler tubes, provided with ground-on, opticallyclear, glass caps.3.2 Color ComparatorA color comparator constructed topermit visual comparison of light transmitted through tall-for
6、m, Nessler tubes in the direction of their longitudinal axes.The comparator should be constructed so that white light ispassed through or reflected off a white glass plate and directedwith equal intensity through the tubes and should be shieldedso that no light enters the tubes from the side.3.3 Dig
7、ital Color InstrumentDigital color instruments areavailable that measure color digitally and convert the result toa numerical value using the Platinum-Cobalt scale. Manymanufacturers market instruments of this type.NOTE 1There are numerous colorimeters and comparators commer-cially available that me
8、asure the color of liquids and take some of thesubjectivity out of the measurement. These instruments may be calibratedwith the platinum-cobalt color standards listed in Table 1 at 455 mm orwith optically standardized color filter disks such as those available for theHellige Aqua Tester. Many of the
9、se instruments take the measurementacross a relatively narrow range of wave lengths, and their readings maybe in error if the color of the sample is significantly different from theamber color of the color standards.4. Reagents4.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.
10、Unless otherwise indicated, it is intended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.2Other grades may beused, provided it is first ascertained that the reagent is ofsufficien
11、tly high purity to permit its use without lessening theaccuracy of the determination.4.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean distilled water or water ofequal purity.4.3 Cobaltous Chloride(CoCl26H2O).4.4 Hydrochloric Acid (sp gr 1.19)Concentrated
12、hydro-chloric acid (HCl).4.5 Potassium Chloroplatinate(K2PtCl6).5. Preparation of Color Standards5.1 Platinum-Cobalt Stock SolutionDissolve 1.245 g ofK2PtCl6and 1.000 g of CoCl26H2O in water. Add 100 mL ofHCl (sp gr 1.19) and dilute to 1 L with water. This solution hasa color of 500.NOTE 2Stock solu
13、tions of Pt-Co 500 color may be purchased fromreagent supply houses. The stock solution should be certified reagent orverified by the user as being correct.5.2 Platinum-Cobalt StandardsFor 100-mL Nessler tubes,prepare color standards as given in Table 1. Dilute the required1This test method is under
14、 the jurisdiction of ASTM Committee D26 onHalogenated Organic Solvents and Fire Extinguishing Agents and is the directresponsibility of Subcommittee D26.04 on Test Methods.Current edition approved June 1, 2015. Published June 2015. Originallyapproved in 1962. Last previous edition approved in 2010 a
15、s D2108 10. DOI:10.1520/D2108-10R15.2Reagent Chemicals, American Chemical Society Specifications, AmericanChemical Society, Washington, DC. For suggestions on the testing of reagents notlisted by the American Chemical Society, see Analar Standards for LaboratoryChemicals, BDH Ltd., Poole, Dorset, U.
16、K., and the United States Pharmacopeiaand 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 States1volumes of the stock solution with water to 100 mL in theNessler tu
17、bes. Cap the tubes and seal the caps with shellac ora waterproof cement.5.3 For 50-mL Nessler tubes, prepare color standards byusing half the volume of stock solution given in Table 1. Thestock solution shall then be diluted with water to 50 mL in theNessler tubes. Cap the tubes and seal the caps wi
18、th shellac ora waterproof cement.6. Procedure6.1 Introduce required sample volume into the Nessler tube,passing the sample through a filter if it has any visible turbidity.Cap the tube, place in the comparator, and compare with thestandards.7. Report7.1 Report the following information:7.1.1 Report
19、as the color, the number of the standard thatmost nearly matches the sample. In the event that the color liesmidway between the two standards, report the darker of thetwo.7.1.2 If, owing to differences in hue between the sample andthe standards, a definite match cannot be obtained, report therange o
20、ver which an apparent match is obtained, and report thesample as “off-hue.”8. Precision and Bias38.1 PrecisionThe intralaboratory precision (one standarddeviation) of this test method is less than 2 Pt-Co units. Theinterlaboratory precision is about 5 Pt-Co units (30 to 40 %relative standard deviati
21、on). The precision was determined by100-mL Nessler tubes.8.2 BiasThe bias of this test method was not determinedas a result of the lack of known standards of color in solvent.9. Keywords9.1 color; halogenated organic solvent; platinum-cobaltscale; Pt-Co color; Pt-Co scaleASTM International takes no
22、position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsi
23、bility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to
24、 ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the addr
25、ess shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone),
26、610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D26-1013.TABLE 1 Platinum-Cobalt Color StandardsColorStandardNumberStockSolution,mLColorStandardNumberStockSolution,mL51 35 710 2 40 815 3 50 1020 4 60 1225 5 70 1430 6 100 20500 100D2108 10 (2015)2
