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ASTM D4901-99(2016)

Historical Reaffirmation

Standard Practice for Preparation of Solution of Liquid Vegetable Tannin Extracts

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1.1 This practice covers the preparation of a solution of liquid extract that is to be used in the tannin analysis of that extract.

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.


4.1 The concentration of tannin in extracts must be reduced to analytical strength (4 g tannin per L) for analysis.

4.2 Vegetable tannin extracts are heterogeneous mixtures of components with varying solubility.

4.3 The solubility of such extracts is influenced by temperature and concentration, which affect the degree of dispersion and size of the component particles.

4.4 While the solubility is better in hot water than in cold water, it is appropriate to dissolve and disperse an extract in hot water and then let the solution cool slowly to standard room temperature.

SDO ASTM: ASTM International
Document Number D4901
Publication Date Sept. 1, 2016
Language en - English
Page Count 2
Revision Level 99(2016)
Supercedes
Committee D31.01
Publish Date Document Id Type View
May 10, 1999 D4901-99 Revision
Dec. 1, 2020 D4901-99R20 Reaffirmation
Sept. 1, 2016 D4901-99R16 Reaffirmation
April 1, 2009 D4901-99R09 Reaffirmation
April 1, 2004 D4901-99R04 Reaffirmation