ASTM D4904-99(2016)

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: D4904 − 99 (Reapproved 2009) D4904 − 99 (Reapproved 2016)
Standard Practice for
Cooling of Analytical Solutions
This standard is issued under the fixed designation D4904; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This practice covers a standard procedure for the cooling of analytical solutions such as those prepared in Practices D4901,
D4905, or D6405. The tannin analysis results for an analytical solution are to some extent dependent on the conditions of the
cooling of that solution.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2.1 ASTM Standards:
D4901 Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts
D4905 Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
D6405 Practice for Extraction of Tannins from Raw and Spent Materials
2.2 ALCA Methods:
A12 Cooling of Analytical Solutions
3. Summary of Practice
3.1 This practice specifies a procedure to follow in cooling to standard or room temperature the hot analytical solutions prepared
from tanning materials for Practices D4901, D4905, or D6405.
4. Significance and Use
4.1 The solubility of extracts is influenced by temperature. The analytical solutions prepared from tanning extracts are dissolved
or diluted in hot water. It is necessary to exercise caution in cooling these solutions, and to do so in such a way as to avoid chilling,
under-cooling, or uneven cooling of the solutions.
5. Specimen
5.1 The specimen shall be the 1-L or 2-L solutions prepared under Practices D4901, D4905, or D6405.
6. Procedure
6.1 The prepared solutions shall be protected from drafts, and shall be allowed to stand overnight in an ambient temperature
of not less than 23°C, nor more than 28°C. After their temperature has been adjusted, the solutions shall be made up to the mark
with distilled water at 23°C. Where a constant temperature room is available , available, the soluti
...