ASTM D8005-2018 1250 Standard Test Method for Color of Clear Liquids (Platinum-Cobalt Scale)《透明液体颜色的标准试验方法(铂钴刻度)》.pdf

1、Designation: D8005 18Standard 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. Scope*1.1 This test method covers a procedure for the visualmeasurement of the color of near clear liquids. It is applicableonly to materials in wh

3、ich 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 bet

4、ween 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

5、test 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 purpor

6、t 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.1.6 This international standard

7、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. Refere

8、nced Documents2.1 ASTM Standards:2D1193 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 Hand

9、ling Liquid CyclicProductsD5386 Test Method 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 Specificati

10、onsE691 Practice for Conducting an Interlaboratory Study toDetermine the Precision of a Test Method2.2 Other Documents:OSHA Regulations, 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.

11、 Significance and Use4.1 The major objective of the visual Pt-Co method of colormeasurement is to rate specific materials for yellowness. Theyellowness is frequently the result of the undesirable tendencyof liquid hydrocarbons to absorb blue light due to contamina-tion in processing, storage, or shi

12、pping.1This test method is under the jurisdiction of ASTM Committee D16 onAromatic, Industrial, Specialty and Related Chemicals and is the direct responsi-bility of Subcommittee D16.01 on Benzene, Toluene, Xylenes, Cyclohexane andTheir Derivatives.Current edition approved Feb. 1, 2018. Published Mar

13、ch 2018. Originallyapproved in 2015. Last previous edition approved in 2015 as D8005 15. DOI:10.1520/D8005-18.2For 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 st

14、andards 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM Internat

15、ional, 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, Gui

16、des and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.15. Apparatus5.1 Spectrophotometer, equipped for liquid samples and formeasurements in the visible region.5.1.1 The spectrophotometer used must be clean and infirst-class operating condition. T

17、he 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 TubesMatched 100-mL, tall-formNessler tubes, provided with gr

18、ound-on, optically clear, glasscaps. 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 Nessler tubes in the d

19、irection 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. Reagents6.1 Purity of Reage

20、ntsReagent 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 beused, provided i

21、t 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 (CoCl26H2O).6.4 H

22、ydrochloric 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, sp gr. 1.19) and

23、 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 reputablechemical supplier

24、s.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 standards arestable for

25、 at least one year and do not degrade markedly for twoyears.8(Table 3)7. Hazards7.1 Consult current OSHA regulations, suppliers SafetyData Sheets, and local regulations for all materials used in thistest method.4See NIST Circular LC-1017.5The sole source of supply of the apparatus known to the commi

26、ttee at this timeis Scientific Glass and Instruments, 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 committe

27、e,1which you may attend.6Reagent 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

28、United States Pharmacopeiaand National Formulary, 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,

29、” Materials Research and Standards, Vol 6, 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 Ligh

30、t ColorsColor StandardNumberStock Solution,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 4.00TABLE 3 Platinum-Cobalt Color StandardsColor StandardNumberStock Solution,mLC

31、olor 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 1828. Sampling and Handling8.1 Refer to Practice D3437 for proper sampling and han-dling of liquid hydrocarbons analyzed by this test method.9. Procedure9.1 Introduce 100 mL

32、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 standards that are1 Pt-Co color unit apart.9.1.2 For samples between 20 and 100, use stan

33、dards 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, report the darker ofthe two.10.1.1 For samples with a Pt-Co color between 1 and 20,when the

34、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, owing to differences in hue between the specimenand the standards, a definite match cannot be

35、 obtained, reportthe range over which an apparent match is obtained, and reportthe material as “off-hue.”11. Precision911.1 An ILS was conducted which included three laborato-ries analyzing three samples two times for samples between 3and 20 Pt-Co color. Two laboratories analyzed five samplestwo tim

36、es for samples between 30 and 60 Pt-Co color. PracticeE691 was followed for the design and analysis of the data; thedetails are given isASTM Research Report RR:D16-1063. TheILS did not meet the minimum requirements of Practice E691of six laboratories, four materials and duplicate analyses ofeach mat

37、erial.11.2 Repeatability (r)Results should not be suspect unlessthey differ by more than shown in Table 4. Results differing byless than r have a 95 % probability of being correct.11.3 Reproducibility (R)Results submitted by two labsshould not be considered suspect unless they differ by morethan sho

38、wn in Table 4. Results differing by less than R have a95 % probability of being correct.11.4 BiasThis test procedure has no bias because thevalue of the test result is defined only in terms of the testmethod.12. Quality Guidelines12.1 Laboratories shall have a quality control system inplace.12.1.1 C

39、onfirm the performance of the 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 a

40、nalyzed.12.1.3 When QA/QC protocols 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 statisti

41、cal quality control practices.13. Keywords13.1 clear liquids; color; platinum-cobalt color scale; Pt-Co9Supporting data have been filed at ASTM International Headquarters and maybe obtained by requesting Research Report RR:D16-1063. ContactASTM CustomerService at serviceastm.org.TABLE 4 Repeatabilit

42、y and Reproducibility ResultsAverage Pt-Co ColorRepeatabilityrReproducibiltyR33510 4 821 6 630 4 460 7 11D8005 183SUMMARY OF CHANGESCommittee D16 has identified the location of selected changes to this standard since the last issue (D8005-15)that may impact the use of this standard. (Approved Februa

43、ry 1, 2018.)(1) Precision statement was revised for ILS.ASTM 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 of any such patent

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