ASTM D6016-96

Standard Test Method for Determination of Nitrogen, Water Extractable in Leather

SCOPE
1.1 This test method covers quantitatively determining the water extractable nitrogen in leather.  
1.2 The values given in SI units are to be regarded as the 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.

General Information

• Status: Historical
• Publication Date: 09-Oct-1996
• Technical Committee: D31 - Leather
• Drafting Committee: D31.06 - Chemical Analysis

Relations

• Replaced By: ASTM D6016-96(2001) - Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
• Effective Date: 10-Oct-1996

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 6016 – 96
Standard Test Method for
Determination of Nitrogen, Water Extractable in Leather
This standard is issued under the fixed designation D 6016; 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 5.2 See Test Method D 3495.
5.3 See Test Method D 2876.
1.1 This test method covers quantitatively determining the
water extractable nitrogen in leather.
6. Procedure
1.2 The values given in SI units are to be regarded as the
6.1 Follow the procedure for Test Method D 3495. Save
standard.
extracted leather and follow the procedure in 7.1 only of Test
1.3 This standard does not purport to address all of the
Method D 2876.
safety concerns, if any, associated with its use. It is the
6.2 When 1 L has been collected, cool the litre flask with
responsibility of the user of this standard to establish appro-
contents to room temperature, readjusted up to 1 L with
priate safety and health practices and determine the applica-
distilled water and mixed thoroughly. Transfer 500 mL of the
bility of regulatory limitations prior to use.
solution to an 800-mL Kjeldahl flask. Add8gof digestion
2. Referenced Documents catalyst (see Test Method D 2868) and 20 mL of sulfuric acid
(specific gravity 1.83) to the solution and the contents of the
2.1 ASTM Standards:
flask mixed thoroughly.
D 2868 Test Method for Nitrogen Content (Kjeldahl) and
2 6.3 Digest the mixture over a low heat source until all
Hide Substance Content of Leather
organic matter is oxidized as indicated by the end of foaming
D 2876 Test Method for Water-Soluble Matter of Vegetable-
2 and clearing of the solution. When foaming has ceased and the
Tanned Leather
solution has cleared, apply full heat to the mixture and continue
D 3495 Test Method for Hexane Extraction of Leather
digestion for a minimum of 1 h. After digestion is complete,
D 3790 Test Method for Volatile Matter (Moisture) of
remove the flask from the heat, and allow to cool to room
Leather by Oven Drying
temperature. Then add 25 mL of 8 % sodium thiosulfate and set
2.2 Federal Standard:
aside the flask for 5 to 10 min with occasional stirring.
Federal Test Standard No. 311, Method 6452 Nitrogen,
6.4 Follow distillation and titration procedure in 7.3 of Test
Water Extractable
Method D 2868.
3. Significance and Use
7. Calculation
3.1 This test method provides the means to determine
7.1 Calculate the water extractable nitrogen in the specimen
nitrogen containing water extractable materials such as excess
as follows:
and loosely bound tannins, ammonium salts, and nitrates.
water extractable nitrogen ~moisture2free basis!,%
4. Appar
...