1、Designation:D814822Standard Test Method forSpectroscopic Determination of Haze in Fuels1This standard is issued under the fixed designation D8148;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 p
2、arentheses 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 spectroscopic procedure fordetermining the level of suspended water and particulatecontamination(haze)in liquid middle dist
3、illate fuels includingthose blended with synthesized hydrocarbons or biofuels.1.1.1 An ordinal,whole-number,Instrument Haze Rating(IHR)from 1 to 6 and a Haze Clarity Index(HCI)from 50.0 to100.0 are determined on a test specimen at a temperature of22.0 C 6 2.0 C.1.1.1.1 The stated precision only appl
4、ies at this temperature.1.1.1.2 Fuels analyzed at other test specimen temperaturesmay not be as precise.1.2 The values stated in SI units are to be regarded asstandard.Other units of measurement included in this standardare defined in Section 3.1.3 This standard does not purport to address all of th
5、esafety 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-danc
6、e 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.Referenced Documents2.1 ASTM Standard
7、s:2D4057 Practice for Manual Sampling of Petroleum andPetroleum ProductsD4175 Terminology Relating to Petroleum Products,LiquidFuels,and LubricantsD4176 Test Method for Free Water and Particulate Contami-nation in Distillate Fuels(Visual Inspection Procedures)D4177 Practice for Automatic Sampling of
8、 Petroleum andPetroleum ProductsD6300 Practice for Determination of Precision and BiasData for Use in Test Methods for Petroleum Products,Liquid Fuels,and Lubricants3.Terminology3.1 DefinitionsFor definitions of terms used in this testmethod,refer to Terminology D4175.3.2 Definitions of Terms Specif
9、ic to This Standard:3.2.1 check standard cuvette,ncuvette containing a certi-fied solid semi-transparent material that is used to confirminstrument operation and calibration.3.2.2 clear-and-bright(also termed clean-and-bright),adja condition in which the fuel is free of haze or cloudiness.3.2.2.1 Di
10、scussionThis clear and bright definition doesnot consider the presence of visible water droplets or solidparticulates and is restricted to the presence of visible haze orcloudiness in the sample.3.2.3 crown glass,na type of optical glass having a lowrefractive index and low dispersion.3.2.4 cuvette
11、transfer time,na user-set timed event thatlimits the amount of time the operator has to prepare the testspecimen and instrument for analysis.3.2.5 Haze Clarity Index(HCI),na numerical value from50.0 to 100.0 that indicates fuel clarity derived from spectro-scopic measurements and an algorithm.3.2.5.
12、1 DiscussionThe HCI values increase with sampleclarity and ranges from 100.0 HCI(very clear and bright)to50.0 HCI(very cloudy and opaque).Accordingly,a fuel withan HCI value of 90.0 has less haze than a fuel with an HCIvalue of 80.0.HCI can be used to evaluate haze intensitychanges within a given IH
13、R.3.2.6 Instrument Haze Rating(IHR),nan ordinal,whole-number from 1 to 6,that corresponds to haze ratings defined inTest Method D4176,Procedure 2 and is assigned to the testspecimen based upon spectroscopic measurements and analgorithm.3.2.7 optically clear,adjtransparent to light having wave-length
14、s from 340 nm to 2500 nm.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.14 on Stability,Cleanliness and Compatibility of Liquid Fuels.Current edition approved April 1,2022.Publishe
15、d April 2022.Originallyapproved in 2017.Last previous edition approved in 2017 as D8148 17.DOI:10.1520/D8148-22.2For 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 stand
16、ards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright 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
