1、Designation: D 4653 87 (Reapproved 2003)Standard Test Method forTotal Chlorides in Leather1This standard is issued under the fixed designation D 4653; 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 (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 method is intended for use in determining tota
3、lchlorides in mineral tanned leather.1.2 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 standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory lim
4、itations prior to use.2. Referenced Documents2.1 ASTM Standards:D 2813 Practice for Sampling Leather for Physical andChemical Tests23. Significance and Use3.1 This test method is used to determine amount of solublechlorides in leather.4. Apparatus4.1 Volumetric Flask, 250 mL.5. Reagents5.1 Acetic Ac
5、id Solutions5 or 10 % by volume.5.2 Methyl Orange0.02 % solution in 50 % alcohol.5.3 Ammonium Hydroxide Solution, (0.1 N).5.4 Silver Nitrate, Standard Solution, (0.1 N).5.5 Potassium Chromate Solution,5%.6. Sampling, Test Specimens and Test Units6.1 The test specimen shall consist of1gofleather from
6、 thecomposite sample in accordance with Practice D 2813.6.2 Two specimens from the composite sample shall betested.7. Procedure7.1 Weigh the specimen to the nearest milligram and recordthe value as W. Transfer the specimen to a 250 mL volumetricflask and add 200 mL of 0.1 N ammonium hydroxide soluti
7、on.Immerse the flask up to the neck in a bath of boiling water.Thoroughly wet all particles by occasional swirling. After 2 h,cool the flask to room temperature and make the flask up tovolume with distilled water, shake and without delay filterthrough a folded filter paper.7.2 Discard the first 20 t
8、o 25 mL of the filtrate. Pipette 200mL of the filtrate into a 600 mL beaker, add a few drops ofmethyl orange indicator and neutralize with 5 % acetic acid toan orange color.Add 2 to 3 mL of 5 % potassium chromate andtitrate the solution with 0.1 N silver nitrate. Record themillilitre of silver nitra
9、te asA. Titrate 200 mL of distilled watercontaining a few drops of methyl orange indicator and 2 to 3mL of 5 % potassium chromate with 0.1 N silver nitrate as ablank and the millilitre of silver nitrate used and recorded as B.8. Calculation of Results8.1 Calculate the percent total chlorides as foll
10、ows:total chlorides,%5 A 2 B!N/W 3 0.0355 3 250/200 3 100 (1)where:A = millilitres of standard silver nitrate used for titratingthe sample,B = millilitres of standard silver nitrate used for titratingthe blank,N = normality of the standard silver nitrate, andW = weight of the specimen.8.2 The total
11、chlorides in the sample for test shall be theaverage of the test result obtained from the specimens tested.9. Report9.1 Unless otherwise specified in the detail specification, theresult shall be reported to the nearest 0.1 %.10. Precision and Bias10.1 This test method is adopted from the procedures
12、of theAmerican Leather ChemistsAssociation where it has long beenin use and where it was approved for publication before theinclusion of precision and bias statements were mandated. Theoriginal inter-laboratory test data is no longer available. Theuser is cautioned to verify by the use of reference
13、materials, if1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on Chemical Analysis.Current edition approved May 10, 2003. Published June 2003. Originallyapproved in 1987. Last previous edition approved in 1998 as D 46
14、53 87 (1998).2Annual Book of ASTM Standards, Vol 15.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.available, that the precision and bias of this test method isadequate for the contemplated use.11. Keywords11.1 mineral tanned lea
15、ther; total chloridesASTM 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 rights, and the riskof infringemen
16、t 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 are invited either for revision of this standard or f
17、or 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 received a fair hearing you shouldmake your views know
18、n 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).D 4653 87 (2003)2
