ASTM_D_2108_-_10_2020.pdf

Designation:D210810(Reapproved 2020)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 the 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 solvents 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,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Significance and Use2.1 Color may be indicative of the quality of the solventbecause any color present is due to the presence of contami-nants.3.Apparatus3.1 Color Comparison TubesMatched 50 mL 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-form,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 Digital 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.NOTE1There are numerous colorimeters and comparators commer-cially available that measure 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 these 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.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 ofsufficiently 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(CoCl2 6H2O).4.4 Hydrochloric Acid(sp gr 1.19)Concentrated 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 CoCl2 6H2O in water.Add 100 mL ofHCl(sp gr 1.19)and dilute to 1 L with water.This solution hasa color of 500.1This test method is under 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 Jan.1,2020.Published January 2020.Originallyapproved in 1962.Last previous edition approved in 2015 as D210810(2015).DOI:10.1520/D210810R20.2Reagent 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.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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical