1、Designation: D 6447 03An American National StandardStandard Test Method forHydroperoxide Number of Aviation Turbine Fuels byVoltammetric Analysis1This standard is issued under the fixed designation D 6447; the number immediately following the designation indicates the year oforiginal adoption or, in
2、 the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope*1.1 The test method covers the determination of the hydro-peroxide content of aviatio
3、n turbine fuels.The test method mayalso be applicable to the determination of the hydroperoxidecontent of any water-insoluble, organic fluid, particularlydiesel fuels, gasolines, and kerosines.1.2 The values stated in SI units are to be regarded as thestandard.1.3 This standard does not purport to a
4、ddress all the safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to consult and establish appropriatesafety and health practices and determine the applicability ofregulatory limitations prior to use. For specific warningstatements, see 6.3-6.5, Ann
5、ex A1, and Annex A2.2. Referenced Documents2.1 ASTM Standards:2D 1193 Specification for Reagent WaterD 3703 Test Method for Peroxide Number of AviationTurbine FuelsD 4057 Practice for Manual Sampling of Petroleum andPetroleum Products3. Summary of Test Method3.1 A quantity of sample is contacted wit
6、h aqueous potas-sium iodide solution in the presence of acid. The hydroperox-ides present are reduced by the potassium iodide. An equiva-lent amount of iodine is liberated, which is quantified byvoltammetric analysis. The results are calculated and reportedas millimoles (mmole) of hydroperoxide per
7、litre of sample.4. Significance and Use4.1 This test method is functionally equivalent to TestMethod D 3703, which uses an ozone depleting substance,(1,1,2-trichloro-1,2,2-trifluoroethane). The use of an ozonedepleting substance precludes U. S. military bases from utiliz-ing Test Method D 3703. This
8、 test method and Test MethodD 3703 measure the same peroxide species (primarily hydro-peroxides) in aviation fuels.4.2 The magnitude of the hydroperoxide number is anindication of the quantity of oxidizing constituents present.Deterioration of fuel results in the formation of hydroperoxidesand other
9、 oxygen-carrying compounds. The hydroperoxidenumber measures those compounds that will oxidize potassiumiodide.4.3 The determination of the hydroperoxide number of fuelsis significant because of the adverse effect of hydroperoxidesupon certain elastomers in the fuel systems.5. Apparatus5.1 Voltammet
10、ric Analyzer3The instrument used to quan-tify the liberated iodine is a voltammetric analyzer equippedwith a three electrode system and a digital or analog output.The combination electrode system (see Fig. 1) consists of aglassy carbon disc (3-mm diameter) working electrode, aplatinum wire (0.5 mm d
11、iameter) auxiliary electrode, and aplatinum wire (0.5 mm diameter) reference electrode. Thevoltammetric analyzer applies a linear voltage ramp (0 to 1 Vrange with respect to the reference electrode) at a rate of 0.1V/s to the auxiliary electrode. The current output of theworking electrode is convert
12、ed to voltage by the voltammetricanalyzer, using the gain ratio of 1V/20A. The peak height orpeak area of the voltammetric response to iodine is outputted toan analog or digital recording device (0 to 1 V full scale).5.2 Vortex Mixer,4with a 2800 to 3000 rpm motor and apad suitable for mixing test t
13、ubes and vials.5.3 Pipette, or equivalent, capable of delivering volumesrequired in the test method, such as 0.2, 1, and 2 mL.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and is the direct responsibility of SubcommitteeD02.05 on Properties of
14、Fuels, Petroleum Coke and Carbon Material.Current edition approved Nov. 1, 2003. Published November 2003. Originallyapproved in 1999. Last previous edition approved in 1999 as D 644799.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceast
15、m.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Voltammetric analyzers specifically designed to perform hydroperoxide valuedeterminations of aviation turbine fuels are commercially available from TheUniversity of Dayton Res
16、earch Institute. Voltammographs, which can be set up toperform hydroperoxide value determinations of aviation turbine fuels, are availablefrom BAS, West Lafayette, IN and EG hydroperoxide number;peroxideANNEXES(Mandatory Information)A1. MATERIAL WARNING STATEMENTSA1.1 Hydrochloric Acid (concentrated
17、)(WarningPoison. Corrosive. Can be fatal if swallowed. Causes severeburns. Harmful if inhaled.)A1.2 Acetic Acid (glacial)(WarningPoison. Corro-sive. Combustible. May be fatal if swallowed. Causes severeburns. Harmful if inhaled.)A1.3 Potassium Dichromate(WarningPoison. Can befatal if swallowed.Avoid
18、 contact with eyes and skin, and avoidbreathing of dust. Strong oxidizer. Possible cancer hazard.)A2. PRECAUTIONARY HANDLING STATEMENTSA2.1 The following safety precautions should be followedin handling the materials listed in Annex A1.A2.1.1 Do not get in eyes, on skin, or on clothing.A2.1.2 Do not
19、 breathe vapor, spray, or mist.A2.1.3 Dilute by addition of acid to water.A2.1.4 Keep away from heat and open flame.A2.1.5 Keep in tightly closed container in approved storagecabinet.A2.1.6 Keep cool.A2.1.7 Loosen closure carefully when opening.A2.1.8 Use with adequate ventilation.A2.1.9 Keep contai
20、ner closed when not in use.A2.1.10 Use protective clothing and goggles when han-dling.A2.1.11 Wash thoroughly after handling.SUMMARY OF CHANGESSubcommittee D02.05 has identified the location of selected changes to this standard since the last issue(D 644799) that may impact the use of this standard.
21、1) Updated 1.1.(2) Updated repeatability and reproducibility statements toreflect the results determined as part of an interlaboratory studythat was conducted.ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this stan
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23、wed 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 ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsibl
24、e 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 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) 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).D6447034
