ASTM_D_4904_-_99_2020.pdf

Designation:D490499(Reapproved 2020)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 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 practice covers a standard procedure for the cool-ing of analytical solutions such as those prepared in PracticesD4901,D4905,or D6405.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 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,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D4901 Practice 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 Practice3.1 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 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 preparedunder Practices D4901,D4905,or D6405.6.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 23 C,nor more than 28 C.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 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 24 C.7.Keywords7.1 analytical solutions;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 the American Leather Chemists Association.Current edition approved Dec.1,2020.Published December 2020.Originallyapproved in 1989.Last previous edition approved in 2016 as D4904 99(2016).DOI:10.1520/D4904-99R20.2For 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 ASTM 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.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1ASTM 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 infringement of such 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 additional standardsand should be addressed to ASTM International Headquarters.