1、Designation: D 565 99 (Reapproved 2005)An American National StandardStandard Test Method forCarbonizable Substances in White Mineral Oil1This standard is issued under the fixed designation D 565; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、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.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test m
3、ethod covers white mineral oil (Mineral OilUSP and Light Mineral Oil NF) to determine whether itconforms to the standard of quality required for pharmaceuticaluse as defined by the United States Pharmacopeia and theNational Formulary, or the Food and Drug Administration.1.2 The values stated in SI u
4、nits are to be regarded as thestandard.1.2.1 The dimensions for the color comparator (see 5.3 andFig. 1) are excepted for that part of the apparatus.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 s
5、tandard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements, see 2.2. Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water22.2 Offcial Compendia:3United States Pharmacope
6、iaCurrent EditionMonograph on Mineral OilNational FormularyCurrent EditionMonograph on Light Mineral Oil2.3 Government Document:421CFR 172.878 Food and Drug Administration Title3. Summary of Test Method3.1 The mineral oil is treated with concentrated sulfuric acid(H2SO4) under prescribed conditions
7、and the resulting color iscompared with a reference standard to determine whether itpasses or fails the test.4. Significance and Use4.1 This test method is a means for ascertaining whetherpharmaceutical mineral oil conforms to the standards of theUnited States Pharmacopeia, the National Formulary, a
8、nd theFood and Drug Administration.5. Apparatus5.1 Test Tube, as shown in Fig. 1, of heat-resistant glassfitted with a well-ground glass stopper, the stopper and the tubebearing identical and indestructible numbers. The tube shall be140 6 2 mm in length and between 14.5 and 15.0 mm inoutside diamete
9、r, and shall be calibrated at the 5 6 0.2 mL and10 6 0.2 mL liquid levels. The capacity of the tube withstopper inserted shall be between 13.6 and 15.6 mL. A rollededge can be provided for suspending the tube on the cover ofthe water bath.5.2 Water Bath, suitable for immersing the test tube abovethe
10、 10 mL line equipped to maintain a temperature of 100 60.5C. The bath shall be provided with a cover of any suitablematerial with holes approximately 16 mm in diameter throughwhich the test tubes can be suspended.5.3 Color Comparator, of a suitable type for observing thecolor of the acid layer in co
11、mparison with the referencestandard color solution. The size and shape of the comparatorare optional, but the size and shape of the apertures shallconform to the dimensions prescribed in Fig. 1.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products and Lubricants and
12、is the direct responsibility of SubcommitteeD02.06 on Analysis of Lubricants.Current edition approved May 1, 2005. Published May 2005. Originallyapproved in 1940. Last previous edition approved in 1999 as D 565 99.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM C
13、ustomer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from U.S. Pharmacopeial Convention, 12601 Twinbrook Parkway,Rockville, MD 20852.4Available from Standardization Documents Order Desk, DO
14、DSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-50981Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6. Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests. Unless otherwise indicated, it
15、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.5Other grades may beused, provided it is first ascertained that the reagent is ofsufficiently high purity to permit its u
16、se without lessening theaccuracy of the determination.6.2 Purity of WaterUnless otherwise indicated, referencesto water shall be understood to mean distilled water or water ofequal purity conforming to Type III of Specification D 1193.6.3 Cobaltous Chloride Solution (0.25 M)Prepare a solu-tion of hy
17、drochloric acid (HCl) (WarningCauses burns.Vapor extremely irritating.) by mixing 30 mL of concentratedHCl with 1170 mL of water. Slowly add the acid to the water.Dissolve 65 6 1 g of cobaltous chloride hexahydrate(CoCl26H2O) in the HCl solution to make 1000 mL ofsolution. Using a pipet, transfer 5
18、mL of this solution to a 250mL iodine flask. Prepare a solution of sodium hydroxide(NaOH) (WarningCorrosive. Can cause severe burns orblindness. Evolution of heat produces a violent reaction oreruption upon too rapid a mixture with water.) by mixing 5 gof NaOH with 20 mL of water. Add 15 mL of this
19、NaOHsolution to the iodine flask. Add 5 mL of hydrogen peroxide(H2O2) (3 % v/v). Boil for 10 6 1 min, cool, and add2gofpotassium iodide (KI). Prepare a solution of H2SO4(WarningCauses burns. Vapor extremely irritating. Strongoxidizer.) by mixing 6 mL of H2SO4with 18 mL of water.Slowly add the acid t
20、o the water (see Note 1). Add 20 mL ofthis H2SO4solution to the flask.) When the precipitate hasdissolved, titrate the liberated iodine with 0.100 M sodiumthiosulfate (Na2S2O3) solution, using starch solution as anindicator. Each millilitre of Na2S2O3solution is equivalent to0.0238 g of CoCl26H2O. A
21、djust the final volume of CoCl2solution by the addition of HCl solution so that 1 mL contains59.5 mg of CoCl26H2O.NOTE 1This freshly prepared H2SO4solution will be hot. Allow tocool before continuing.6.4 Cupric Sulfate Solution (0.25 M)Prepare a solution ofHCl (Warningsee 6.3) by mixing 30 mL of con
22、centratedHCl with 1170 mL of water. Slowly add the acid to the water.Dissolve 65 6 1 g of cupric sulfate pentahydrate(CuSO45H2O) in enough HCl solution to make 1000 mL ofsolution. Using a pipet, transfer 10 mL of the solution to a250-mL iodine flask, add 40 mL of water. Prepare a 6M aceticacid (CH3C
23、OOH) (WarningCorrosive. Combustible. Vaporirritating.) solution by mixing 353 mL of concentratedCH3COOH with 1000 mL of water. Slowly add the acid to thewater.Add 4 mL of 6M CH3COOH,3gofKland5mLofHClto the flask. Titrate the liberated iodine with 0.100 M Na2S2O3solution, using starch solution as an
24、indicator. Each millilitre ofNa2S2O3solution is equivalent to 0.0250 g of CuSO45H2O.Adjust the final volume of the CuSO4solution by the additionof diluted HCl solution so that 1 mL contains 62.4 mgCuSO45H2O.6.5 Ferric Chloride Solution (0.166 M)Prepare a solutionof HCl (Warningsee 6.3) by mixing 30
25、mL of concentratedHCl with 1170 mL of water. Dissolve 55 6 1 g of ferricchloride hexahydrate (FeCl36H2O) in enough HCl to make1000 mL of solution. Using a pipet, transfer 10 mL of thissolution into a 250-mL iodine flask, add 15 mL water,3gKIand 5 mL HCl, and allow the mixture to stand for 15 6 1 min
26、.Dilute with 100 mL of water and titrate the liberated iodinewith 0.100 M Na2S2O3solution, using starch solution as anindicator. Each millilitre of Na2S2O3solution is equivalent to0.0270 g of FeCl36H2O. Adjust the final volume of FeCl3solution by the addition of the HCl solution so that 1 mLcontains
27、 45.0 mg of FeCl36H2O.5Reagent 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 Un
28、ited States Pharmacopeiaand National Formulary, U.S. Pharmacopeial Convention, Inc. (USPC), Rockville,MD.FIG. 1 Color Comparator for Carbonizable Substances in Liquid PetrolatumD 565 99 (2005)26.6 The solutions prepared in 6.3-6.5 may be prepared indifferent quantities, provided the ratios of compon
29、ents areequivalent.6.7 Colorimetric Reference Standard SolutionPrepare areference standard pale amber solution for color comparison bymixing together 1.5 parts of CoCl2solution, 3.0 parts of theFeCl3solution, and 0.5 parts of the CuSO4solution. Measure5 mL of this mixture into a test tube as specifi
30、ed in 5.1. Thispale amber reference standard shall then be overlaid with 5 mLof white mineral oil.6.8 Sulfuric Acid (94.7 6 0.2 %)The H2SO4shall benitrogen-free when analyzed in accordance with the followingprocedure: Dilute a small amount of the acid with an equalvolume of water and superimpose 10
31、mL of the cooled liquidupon diphenylamine solution (1 g of diphenylamine in 100 mLof concentrated H2SO4). A blue color should not appear at thezone of contact within 1 h. This test detects as little as0.0002 % nitric acid (HNO3).7. Procedure7.1 Clean a test tube with a chromic acid (H2CrO4) cleaning
32、solution (WarningCauses severe burns. A recognized car-cinogen. Strong oxidizer.), or use a nonchromium containing,strongly oxidizing cleaning solution.7.2 Fill the test tube to the 5 mL mark with H2SO4(94.7 60.2 %). Then add the oil to be tested to the 10-mL mark, insertthe stopper loosely, and pla
33、ce the test tube in position in thewater bath at 100 6 0.5C.7.3 After the test tube has been in the water bath for 30 s,loosen the stopper sufficiently to release any pressure andreinsert, remove the test tube from the bath quickly, hold witha finger over the stopper, and give three vigorous, vertic
34、alshakes over an amplitude of about 5 in. (127 mm), shaking thetest tube quickly and at a rate corresponding to 5 shakes/s. (Ashaking machine may be employed provided the results thatcan be obtained agree with those obtained by the prescribedmanual agitation.) Repeat every 30 s. Do not keep the test
35、 tubeout of the bath longer than 3 s for each shaking period.7.4 At the end of 10 min from the time the test tube was firstplaced in the bath, remove the test tube and allow to stand inthe room for not less than 10 min nor more than 30 min.Observe and record any discoloration of the oil layer. Place
36、 thetest tube in the color comparator, and compare the acid layerwith 5 mL of the standard colorimetric solution and 5 mL ofwhite mineral oil in a test tube that has been shaken vigorouslyfor 10 s and allowed to stand just long enough for the contentsto separate into two layers.8. Interpretation of
37、Results8.1 White mineral oil shall be reported as passing the testonly when the oil layer shows no change in color (see Note 2)and when the acid layer is not darker than the referencestandard colorimetric solution.NOTE 2A bluish haze or a slight pink or yellow color in the oil layershould not be int
38、erpreted as a change in color.8.2 If the oil layer is discolored or if the acid layer is darkerthan the reference standard colorimetric solution, white min-eral oil shall be reported as not passing the test.9. Precision and Bias9.1 No statement is made about either the precision or biasof this test
39、method since the result merely states whether thereis conformance to the criteria for success specified in theprocedure.10. Keywords10.1 carbonizable substances; mineral oilASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentione
40、din this standard. Users of this standard are expressly advised that determination of the validity of 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
41、must be reviewed 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
42、theresponsible 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 C
43、700, 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).D 565 99 (2005)3
