ASTM D6401-1999(2009) 317 Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials《植物性单宁材料提取中测定单宁和非单宁的标准试验方法》.pdf
《ASTM D6401-1999(2009) 317 Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials《植物性单宁材料提取中测定单宁和非单宁的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D6401-1999(2009) 317 Standard Test Method for Determining Non-Tannins and Tannin in Extracts of Vegetable Tanning Materials《植物性单宁材料提取中测定单宁和非单宁的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6401 99 (Reapproved 2009)Standard Test Method forDetermining Non-Tannins and Tannin in Extracts ofVegetable Tanning Materials1This standard is issued under the fixed designation D 6401; the number immediately following the designation indicates the year oforiginal adoption or, in the
2、case of revision, the year of last revision. A number 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 determining thequantity of soluble non-tannins a
3、nd tannin in solutions oftannin extracts, water extracts of vegetable tanning materials,or tanning liquors. The method is applicable to the analysis ofliquid, solid, pasty, and powdered extracts and to extracts ofraw or spent materials.1.2 The values stated in SI units are to be regarded as thestand
4、ard. The inch-pound units given in parentheses are forinformation only.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 standard to establish appro-priate safety and health practices and determine th
5、e applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 2617 Test Method for Total Ash in LeatherD 4901 Practice for Preparation of Solution of Liquid Veg-etable Tannin ExtractsD 4902 Test Method for Evaporation and Drying of Ana-lytical SolutionsD 4903 T
6、est Method for Total Solids and Water in VegetableTanning Material ExtractsD 4905 Practice for Preparation of Solution of Solid, Pastyand Powdered Vegetable Tannin ExtractsD 6402 Test Method for Determining Soluble Solids andInsolubles in Extracts of Vegetable Tanning MaterialsD 6405 Practice for Ex
7、traction of Tannins from Raw andSpent Materials2.2 ALCA Method:A22 Non-Tannins and Tannin33. Terminology3.1 Definitions:3.1.1 soluble non-tanninsnon-volatile materials present intannin extracts and raw or spent materials that are dissolved orsuspended in water, are part of the soluble solids determi
8、ned byTest Method D 6402, and do not react with or bind to hidepowder when mixed as in this test method.3.1.2 tanninsnon-volatile materials present in tannin ex-tracts and raw or spent materials that are dissolved or sus-pended in water, are part of the soluble solids determined byTest Method D 6402
9、, and do react with or bind to hide powderwhen mixed as in this test method.4. Summary of Test Method4.1 An aliquot of the analytical solution prepared fromtannin extracts (Practices D 4901 or D 4905) or of the waterextract from raw or spent materials (Practice D 6405) is driedovernight in a forced-
10、air oven (Test Method D 4902) and thesolid residue remaining is determined and defined as the totalsolids for that sample (Test Method D 4903). Another aliquotof the same solution is passed through a specified filteringprocedure and the quantity of solid residue remaining in thefiltrate is determine
11、d and defined as the soluble solids for thatsample; the calculated difference between the total solids andthe soluble solids is defined as the insolubles for that sample(Test Method D 6402). Another aliquot of the original analyti-cal solution or water extract is mixed with a prepared hidepowder mat
12、erial with the resulting solution being passedthrough the same filtering procedure as for the soluble solidsanalysis. The quantity of solid residue remaining in the filtrateis determined and defined as the soluble non-tannins for thatsample; the calculated difference between the total solublesolids
13、and the soluble non-tannins is defined as the tannincontent for that sample.1This test method is under the jurisdiction of ASTM Committee D31 on Leatherand is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. Thismethod has been adapted from and is a replacement for Method A22 o
14、f the OfficialMethods of the American Leather Chemists Association.Current edition approved April 1, 2009. Published July 2009. Originallyapproved in 1999. Last previous edition approved in 2004 as D 6401 99 (2004).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM
15、Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Official Methods of the American Leather Chemists Association. Availablefrom the American Leather Chemists Association, University of Cincinnati,
16、 P.O.Box 210014, Cincinnati, OH 45221-0014.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Significance and Use5.1 This test method is used to determine the proportion ofthe total soluble solids which are soluble non-tannins and t
17、heproportion which are tannins in a solution of tannin extract orin the water extract from raw or spent materials prepared fortannin analysis.5.2 The specimens are aliquots from the analytical solutionsprepared from tannin extracts or the water extract solutionsprepared from raw or spent materials.5
18、.3 The soluble non-tannins are defined as the portion of thesoluble solids which are not absorbed or bound by a preparedhide powder material.5.4 The tannins are defined as the portion of the solublesolids which are absorbed or bound by a prepared hide powdermaterial.5.5 The results of this test meth
19、od are dependent on a greatmany variables but particularly upon:5.5.1 The temperature conditions under which the solutionswere prepared and stored and the temperature at which thecurrent analysis is performed;5.5.2 The uniformity and consistency of the Kaolin pastelayer deposited onto the filter pap
20、er;5.5.3 The rate of solution run-out from the pipette;5.5.4 Conditions related to the properties of the hide powderused to react with the tannin content of the solution; etc. It is,therefore, essential that the method be followed exactly inorder to obtain reproducible results both among specimenswi
21、thin a laboratory and for analyses between laboratories.6. Apparatus and Reagents6.1 Tannin Dish, crystallizing dish, borosilicate glass, 50mm tall, 70 mm outside diameter. The bottom corner shall berounded to a radius of 6 mm, the bottom shall be flat and notcupped in the center, and the top edge s
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