1、Designation: D4904 99 (Reapproved 2016)Standard Practice forCooling of Analytical Solutions1This standard is issued under the fixed designation D4904; 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 () 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 in PracticesD4901, D4905,orD6405
3、. The tannin analysis results for ananalytical solution are to some extent dependent on theconditions of the cooling of that solution.1.2 The values stated in SI units are to be regarded asstandard. No other units of measurement are included in thisstandard.1.3 This standard does not purport to addr
4、ess 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:2D4901 Practice
5、 for Preparation of Solution of Liquid Veg-etable Tannin ExtractsD4905 Practice for Preparation of Solution of Solid, Pastyand Powdered Vegetable Tannin ExtractsD6405 Practice for Extraction of Tannins from Raw andSpent Materials2.2 ALCA Methods:A12 Cooling of Analytical Solutions33. Summary of Prac
6、tice3.1 This practice specifies a procedure to follow in coolingto standard or room temperature the hot analytical solutionsprepared from tanning materials for Practices D4901, D4905,or D6405.4. Significance and Use4.1 The solubility of extracts is influenced by temperature.The analytical solutions
7、prepared from tanning extracts aredissolved or diluted in hot water. It is necessary to exercisecaution in cooling 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 preparedu
8、nder Practices D4901, D4905,orD6405.6. Procedure6.1 The prepared solutions shall be protected from drafts,and 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 wi
9、th distilled water at 23C. Where a constanttemperature room is available, the solutions, suitably protectedfrom 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
10、; cooling; tannin analysis; vegetabletannin analysis1This practice is under the jurisdiction ofASTM Committee 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
11、 the American Leather Chemists Association.Current edition approved Sept. 1, 2016. Published October 2016. Originallyapproved in 1989. Last previous edition approved in 2009 as D4904 99 (2009).DOI: 10.1520/D4904-99R16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
12、TM 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 Cincinna
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16、 technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known 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 Cons
17、hohocken, 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:/ 99 (2016)2
