1、Designation: D8005 15Standard Test Method forColor of Clear Liquids (Platinum-Cobalt Scale)1This standard is issued under the fixed designation D8005; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A num
2、ber 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 a procedure for the visualmeasurement of the color of near clear liquids. It is applicableonly to materials in whi
3、ch the color-producing bodies presenthave light absorption characteristics nearly identical with thoseof the Platinum-Cobalt (Pt-Co) color standards used.1.2 This test method has been found applicable to the colormeasurement of clear, liquid samples, free of haze, withnominal Pt-Co color values betw
4、een 0 and 100. It is applicableto nonfluorescent liquids with light absorption characteristicssimilar to those of the Pt-Co color standard solutions. TestMethods D1209, D1686, and D5386 deal with the visual andinstrumental measurement of near-clear liquids.1.3 In determining the conformance of the t
5、est results usingthis method to applicable specifications, results shall berounded in accordance with the rounding off methods ofPractice E29.1.4 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.5 This standard does not purport
6、 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D1193
7、Specification for Reagent WaterD1209 Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)D1686 Test Method for Color of Solid Aromatic Hydrocar-bons and Related Materials in the Molten State (Platinum-Cobalt Scale)D3437 Practice for Sampling and Handling Liquid CyclicProductsD5386 Test Met
8、hod for Color of Liquids Using TristimulusColorimetryD6809 Guide for Quality Control and Quality AssuranceProcedures for Aromatic Hydrocarbons and Related Ma-terialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with Specifications2.2 Other Documents:OSHA Regulations,
9、 29 CFR paragraphs 1910.1000 and1910.120033. Summary of Test Method3.1 A specimen is placed in a Nessler tube and compared toa series of prepared Pt-Co standards.4. Significance and Use4.1 The major objective of the visual Pt-Co method of colormeasurement is to rate specific materials for yellowness
10、. Theyellowness is frequently the result of the undesirable tendencyof liquid hydrocarbons to absorb blue light due to contamina-tion in processing, storage, or shipping.5. Apparatus5.1 Spectrophotometer, equipped for liquid samples and formeasurements in the visible region.5.1.1 The spectrophotomet
11、er used must be clean and infirst-class operating condition. The instrument should be cali-brated in accordance with the instructions in the Standards forChecking and Calibration of Spectrophotometers (200 to 1000cm).45.2 Spectrophotometer Cells, matched having a 10-mm lightpath.5.3 Color Comparison
12、 TubesMatched 100-mL, tall-formNessler tubes, provided with ground-on, optically clear, glass1This test method is under the jurisdiction of ASTM Committee D16 onAromatic Hydrocarbons and Related Chemicals and is the direct responsibility ofSubcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexan
13、e and TheirDerivatives.Current edition approved June 1, 2015. Published June 2015. DOI: 10.1520/D8005-15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standar
14、ds Document Summary page onthe ASTM website.3Available from U.S. Government Printing Office Superintendent of Documents,732 N. Capitol St., NW, Mail Stop: SDE, Washington, DC 20401, http:/www.access.gpo.gov.4See NIST Circular LC-1017.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700,
15、West Conshohocken, PA 19428-2959. United States1caps. Tubes should be selected so that the height of the 100-mLgraduation mark is 275 to 295 mm above the bottom of thetube.5.4 Color ComparatorA color comparator constructed topermit visual comparison of light transmitted through tall-form100-mL Nessl
16、er tubes in the direction of their longitudinalaxes. The comparator should be constructed so that white lightis passed through or reflected off a white glass plate anddirected with equal intensity through the tubes, and should beshielded so that no light enters the tubes from the side.56. Reagents6.
17、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.6Other grades may b
18、eused, provided it is first ascertained that the agent is ofsufficiently high purity to permit its use without lessening theaccuracy of the determination.6.2 Purity of WaterReferences to water shall be under-stood to mean reagent water conforming to Type IV ofSpecification D1193.6.3 Cobalt Chloride
19、(CoCl26H2O).6.4 Hydrochloric Acid (sp gr 1.19)Concentrated hydro-chloric acid (HCI).6.5 Potassium Chloroplatinate (K2PtCl6).6.6 Pt-Co Stock SolutionDissolve 1.245 g of potassiumchloroplatinate (K2PtCl6) and 1.00 g of cobalt chloride(CoCl26H2O) in water. Carefully add 100 mL of hydrochloricacid (HCl,
20、 sp gr. 1.19) and dilute to 1 L with water. Theabsorbance of the 500 Pt-Co stock solution in a cell having a10-mm light path, with reagent water in a matched cell as thereference solution,7must fall within the limits given in Table 1.NOTE 1This stock solution is commercially available from reputable
21、chemical suppliers.6.7 Pt-Co StandardsFrom the stock solution, preparecolor standards in accordance with Table 2 by diluting therequired volumes to 100 mL with water in the Nessler tubes.Cap the tubes and seal the caps with shellac or a waterproofcement. When properly sealed and stored, these standa
22、rds arestable for at least one year and do not degrade markedly for twoyears.87. Hazards7.1 Consult current OSHA regulations, suppliers SafetyData Sheets, and local regulations for all materials used in thistest method.8. Sampling and Handling8.1 Refer to Practice D3437 for proper sampling and han-d
23、ling of liquid hydrocarbons analyzed by this test method.9. Procedure9.1 Introduce 100 mL of specimen into a Nessler tube,passing the specimen through a filter if it has any visibleturbidity. Cap the tube, place in the comparator, and comparewith the standards.9.1.1 For samples between 1 and 20, use
24、 standards that are1 Pt-Co color unit apart.9.1.2 For samples between 20 and 100, use standards thatare 5 Pt-Co color units apart.10. Report10.1 Report as the Pt-Co color the number of the standardthat most nearly matches the specimen. In the event that thecolor lies midway between two standards, re
25、port the darker ofthe two.10.1.1 For samples with a Pt-Co color between 1 and 20,when the color lies midway between two standards, report thedarker of the two.10.1.2 For samples with a Pt-Co color between 20 and 100,when the color lies midway between the two standards,estimate the value.10.2 If, owi
26、ng to differences in hue between the specimenand the standards, a definite match cannot be obtained, reportthe range over which an apparent match is obtained, and reportthe material as “off-hue.”5The sole source of supply of the apparatus known to the committee at this timeis Scientific Glass and In
27、struments, Inc., P.O. Box 6, Houston, TX 77001. If you areaware of alternative suppliers, please provide this information to ASTM Interna-tional Headquarters. Your comments will receive careful consideration at a meetingof the responsible technical committee,1which you may attend.6Reagent Chemicals,
28、 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 Form
29、ulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.7See the manufacturers instruction manual for complete details for operating thespectrophotometer.8Scharf, W. W., Ferber, K. H., and White, R. G., “Stability of Platinum- CobaltColor Standards,” Materials Research and Standards, Vol 6,
30、No. 6, June 1966, pp.302-304.TABLE 1 Absorbance Tolerance Limits for No. 500 Platinum-Cobalt Stock SolutionWavelength, nm Absorbance430 0.100 to 0.120455 0.130 to 0.145480 0.105 to 0.120510 0.055 to 0.065TABLE 2 Platinum-Cobalt Color Standards for Very Light ColorsColor StandardNumberStock Solution,
31、mLColor StandardNumberStock Solution,mL1 0.20 11 2.202 0.40 12 2.403 0.60 13 2.604 0.80 14 2.805 1.00 15 3.006 1.20 16 3.207 1.40 17 3.408 1.60 18 3.609 1.80 19 3.8010 2.00 20 4.00D8005 15211. Precision11.1 A single sample near Pt-Co = 1 was analyzed 20 timesby a single person using one instrument o
32、ver the shortestpractical time. A second sample near Pt-Co = 15 was alsoanalyzed 20 times by a single person using one instrument overthe shortest practical time.11.2 Repeatability:11.2.1 All results for the Pt-Co equal 1 and 15 were thesame.11.3 Reproducibility:11.3.1 Reproducibility has not been d
33、etermined and will bedetermined within five years.11.4 BiasThis test procedure has no bias because thevalue of the test result is defined only in terms of the testmethod.Table 3.12. Quality Guidelines12.1 Laboratories shall have a quality control system inplace.12.1.1 Confirm the performance of the
34、test instrument ortest method by analyzing a quality control sample followingthe guidelines of standard statistical quality control practices.12.1.2 A quality control sample is a stable material isolatedfrom the production process and representative of the samplebeing analyzed.12.1.3 When QA/QC prot
35、ocols are already established inthe testing facility, these protocols are acceptable when theyconfirm the validity of test results.12.1.4 When there are no QA/QC protocols established inthe testing facility, use the guidelines described in GuideD6809 or similar statistical quality control practices.
36、13. Keywords13.1 clear liquids; color; platinum-cobalt color scale; Pt-CoASTM International takes no 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 o
37、f any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.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 a
38、re invited either for revision of this standard or for additional standardsand should be addressed to 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 re
39、ceived a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address 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)
40、 of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 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:/ 3 Platinum-Cobalt Color StandardsColor StandardNumberStock Solution,mLColor StandardNumberStock Solution,mL25 5 65 1330 6 70 1435 7 75 1540 8 80 1645 9 85 1750 10 90 1855 11 95 1960 12 100 20D8005 153
