1、Designation: D 4654 87 (Reapproved 2003)Standard Test Method forSulfate Basicity in Leather1This standard is issued under the fixed designation D 4654; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A nu
2、mber in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is intended for use in calculating thesulfate basicity of mineral tanned leather.1.2 This standard does not purport to
3、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 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 2807 Test
4、 Method for Chromic Oxide in Leather (Per-chloric Acid Oxidation)2D 4655 Test Methods for Sulfates in Leather (Total, Neu-tral, and Combined Acid)23. Significance and Use3.1 This test method is used to determine the percent of totalchromic oxide that is combined with hydroxyl and may serveas a measu
5、re of chrome fixation.4. Apparatus and Reagents4.1 The apparatus and reagents shall be as described in TestMethods D 2807 and D 4655.5. Sampling, Test Specimens and Test Units5.1 The test specimen shall be as described in Test MethodsD 2807 and D 4655.5.2 Unless otherwise specified in the detail spe
6、cifications,two specimens from the composite sample shall be tested.5.3 The percent basicity of the sample for test shall be theaverage of the test results obtained from the specimens tested.6. Procedure6.1 The chromic oxide shall be determined as described inTest Method D 2807. The combined sulfate
7、 shall be deter-mined as described in Method D 4655.7. Calculation of Results7.1 Express the percent basicity of the specimen accordingto Schorlemmers system. In this system, the percent basicity isthe percent of the total chromic oxide that is combined withhydroxyl. Conversely, the percent acidity
8、is the percent of thetotal chromic acid that is combined with sulfate or other acidanions. Percent basicity is therefore 100 % acidity.sulfate basicity, % 5 100 2 % combined sulfate3 52.8/% total chromic oxide (1)7.2 When other metals that form hydrolysable sulfates arepresent, add their equivalent
9、percent of chromic oxide to thechromic oxide present before calculating percent basicity. Usethe following conversion factors: % Al2O33 1.49, %ZrO23 0.82, and % Fe2O33 0.95.7.3 Report the results to the nearest 0.1 %.8. Precision and Bias8.1 This test method is adopted from the procedures of theAmer
10、ican Leather Chemists Association 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 material
11、ifavailable that the precision and bias of this test method isadequate for the contemplated use.9. Keywords9.1 chrome fixation; Schorlemmers system; sulfate basicity1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on
12、Chemical Analysis.Current edition approved May 10, 2003. Published June 2003. Originallyapproved in 1987. Last previous edition approved in 1998 as D 4654 87 (1998).2Annual Book of ASTM Standards, Vol 15.04.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 1942
13、8-2959, United States.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 rights, and the riskof infringeme
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16、wn 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 4654 87 (2003)2
