ASTM D4905-99
(Practice)Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
Standard Practice for Preparation of Solution of Solid, Pasty and Powdered Vegetable Tannin Extracts
SCOPE
1.1 This practice is intended for use in preparing a solution of solid, pasty, or powdered extract for the use in determining the total solids, soluble solids and nontannins.
1.2 This standard may involve hazardous materials, operations, and equipment. This standard does not purport to address all of the safety problems 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.
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Designation: D 4905 – 99
Standard Practice for
Preparation of Solution of Solid, Pasty and Powdered
Vegetable Tannin Extracts
This standard is issued under the fixed designation D 4905; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 4.2 Vegetable tannin extracts are heterogeneous mixtures of
components with varying solubility.
1.1 This practice covers a standard procedure for use in
4.3 The solubility of such extracts is influenced by tempera-
preparing the analytical solution required for the analysis of
ture and concentration, which affect the degree of dispersion
solid, pasty, or powdered vegetable tannin extracts.
and size of the component particles.
1.2 This standard does not purport to address all of the
4.4 Since extracts have greater solubility in hot water than
safety concerns, if any, associated with its use. It is the
cold, it is desirable to dissolve and disperse an extract in hot
responsibility of the user of this standard to establish appro-
water and then let the solution cool slowly to standard room
priate safety and health practices and determine the applica-
temperature.
bility of regulatory limitations prior to use.
4.5 It is often difficult to reduce samples of solid and
2. Referenced Documents
particularly pasty extracts to specimen size and at the same
time ensure representative sampling. Therefore, caution is
2.1 ASTM Standards:
advised in drawing conclusions on the precision and bias of the
D 4903 Test Method for Total Solids and Water in Vegetable
results obtained on such extracts; where difficulties in sample
Tanning Material Extracts
preparation are experienced, little confidence can be placed in
D 4904 Practice for Cooling of Analytical Solutions
the results.
D 6403 Test Method for Determining Moisture in Raw and
Spent Materials
5. Specimen
D 6404 Practice for Sampling of Vegetable Materials Con-
5.1 The specimen shall consist of a portion of the extract
taining Tannin
sample, prepared as described in Practice D 6404 , sufficient to
2.2 ALCA Method:
give a solution containing as nearly as possible4gof tannin
A11 Preparation of Solution of Solid, Pasty, and Powdered
3 per L (not less than 3.75 g, nor more than 4.25 g, per L).
Extracts
6. Apparatus and Reagents
3. Summary of Practice
6.1 Formaldehyde—40 % solution.
3.1 This practice describes a procedure to follow in the
6.2 Toluene—Assay $ 99.5 %.
preparation of analytical strength solutions from samples of
6.3 Small Mortar and Pestle.
solid, pasty, and powdered vegetable tannin extracts.
6.4 1-L Volumetric Flask, M.C.A. type, mixing bulb style.
4. Significance and Use
7. Procedure
4.1 The concentration of tannins in solid, pasty, and pow-
7.1 Empty the sample onto a sheet of clean, glazed paper (or
dered extracts needs to be reduced to analytical strength for
suitable clean, smooth foil material), roughly crush any large
tannin analyses.
lumps, and quickly mix and quarter the whole. From each
quarter, take a small representative portion, quickly crush,
This practice is under the jurisdiction of ASTM Committee D-31 on Leather
transfer to a small, glass stoppered weighing bottle, and take to
and is the direct responsibility of Subcommittee D31.01 on Vegetable Leather. This
the balance. Without delay, transfer the analytical specimen to
practice has been adapted from and is a replacement for Method A11 of the Official
a tared container of suitable size and weigh to the nearest 0.1
Methods of the American Leather Chemists Association.
mg. Each sample shall be handled individually, and all opera-
Current edition approved May 10, 1999. Published August 1999. Originally
published as D 4905–89. Last previous edition D 4905–89(1995).
tions carried out as quickly as possible, up to this point, and all
Annual Book of ASTM Standards, Vol 15.04.
other precautions taken to minimize changes in moisture
Official Methods of the American Leather
...
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