1、Designation: D 4904 99 (Reapproved 2004)Standard Practice forCooling of Analytical Solutions1This standard is issued under the fixed designation D 4904; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A n
2、umber 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 practice covers a standard procedure for the cool-ing of analytical solutions such as those prepared PracticesD 4901, D 4905, or D
3、 6405. The tannin analysis results for ananalytical solution are to some extent dependent on theconditions of the cooling of that solution.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
4、 establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 4901 Practice for Preparation of Solution of Liquid Veg-etable Tannin ExtractsD 4905 Practice for Preparation of Solution of Solid,
5、 Pastyand Powdered Vegetable Tannin ExtractsD 6405 Practice for Extraction of Tannins from Raw andSpent Materials2.2 ALCA Methods:A12 Cooling of Analytical Solutions33. Summary of Practice3.1 This practice specifies a procedure to follow in coolingto standard or room temperature the hot analytical s
6、olutionsprepared from tanning materials for Practices D 4901, D 4905,or D 6405.4. Significance and Use4.1 The solubility of extracts is influenced by temperature.The analytical solutions prepared from tanning extracts aredissolved or diluted in hot water. It is necessary to exercisecaution in coolin
7、g these solutions and to do so in such a wayas to avoid chilling, under-cooling, or uneven cooling of thesolutions.5. Specimen5.1 The specimen shall be the 1-L or 2-L solutions preparedunder Practices D 4901, D 4905, or D 6405.6. Procedure6.1 The prepared solutions shall be protected from draftsand
8、shall be allowed to stand overnight in an ambient tempera-ture of not less than 23C, nor more than 28C. After theirtemperature has been adjusted, the solutions shall be made upto the mark with distilled water at 23C. Where a constanttemperature room is available , the solutions, suitably protectedfr
9、om drafts, may be cooled therein with advantage. In this case,the room shall be so controlled that solutions in flasks, exposedtherein, shall remain at 24C.7. Keywords7.1 analytical solutions; cooling; tannin analysis; vegetabletannin analysis1This practice is under the jurisdiction of ASTM Committe
10、e D31 on Leather andis the direct responsibility of Subcommittee D31.01 on Vegetable Leather. Thispractice has been adapted from and is a replacement for Method A12 of the OfficialMethods of the American Leather Chemists Association.Current edition approved April 1, 2004. Published May 2004. Origina
11、llyapproved in 1989. Last previous edition approved in 1999 as D 490499.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe AS
12、TM website.3Official Methods of the American Leather Chemists Association. Availablefrom the American Leather Chemists Association, University of Cincinnati, P.O.Box 210014, Cincinnati, OH 452210014.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,
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14、ch 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 for addi
15、tional 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 known to th
16、e 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 4904 99 (2004)2
