1、Designation: D4654 87 (Reapproved 2015)Standard Test Method forSulfate Basicity in Leather1This standard is issued under the fixed designation D4654; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A numb
2、er in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 add
3、ress 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:2D2807 Test Me
4、thod for Chromic Oxide in Leather (Perchlo-ric Acid Oxidation)D4655 Test Methods for Sulfates in Leather (Total, Neutral,and Combined Acid)3. 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 measure of ch
5、rome fixation.4. Apparatus and Reagents4.1 The apparatus and reagents shall be as described in TestMethods D2807 and D4655.5. Sampling, Test Specimens and Test Units5.1 The test specimen shall be as described in Test MethodsD2807 and D4655.5.2 Unless otherwise specified in the detail specifications,
6、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 D2807. The combined sulfate shall be det
7、erminedas described in Method D4655.7. 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 is the percent o
8、f thetotal chromic acid that is combined with sulfate or other acidanions. Percent basicity is therefore 100 % acidity.sulfate basicity, % 5 100 2 % combined sulfate352.8/% total chromic oxide (1)7.2 When other metals that form hydrolysable sulfates arepresent, add their equivalent percent of chromi
9、c oxide to thechromic oxide present before calculating percent basicity. Usethe following conversion factors: % Al2O3 1.49, %ZrO2 0.82, and % Fe2O3 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 theAmerican Leather Chemist
10、sAssociation 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 ifavailable that the
11、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 ofASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.06 on Chemical Analysis.Curr
12、ent edition approved Sept. 1, 2015. Published October 2015. Originallyapproved in 1987. Last previous edition approved in 2009 as D4654 87 (2009).DOI: 10.1520/D4654-87R15.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Ann
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17、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). Permission rights to photocopy the standard may also be secured from the Copyright Clearance Center, 222Rosewood Drive, Danvers, MA 01923, Tel: (978) 646-2600; http:/ 87 (2015)2
