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ASTM

ASTM D6016-06

(Test Method)

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

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

SIGNIFICANCE AND USE
This test method provides the means to determine nitrogen containing water extractable materials such as excess and loosely bound tannins, ammonium salts, and nitrates.
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
30-Sep-2006
ICS
59.140.30 - Leather and furs
Technical Committee
D31 - Leather
Drafting Committee
D31.06 - Chemical Analysis
Current Stage
Ref Project

Relations

Replaces
ASTM D6016-96(2001) - Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
Effective Date
01-Oct-2006
Replaced By
ASTM D6016-06(2012) - Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
Effective Date
01-Apr-2012

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ASTM D6016-06 - Standard Test Method for Determination of Nitrogen, Water Extractable in LeatherASTM D6016-06 - Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
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ASTM D6016-06 - Standard Test Method for Determination of Nitrogen, Water Extractable in Leather
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6016–06
Standard Test Method for
1
Determination of Nitrogen, Water Extractable in Leather
This standard is issued under the fixed designation D6016; 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 4. Apparatus
1.1 This test method covers quantitatively determining the 4.1 Volumetric Flask,1L.
water extractable nitrogen in leather. 4.2 Kjeldahl Apparatus, see Test Method D2868.
1.2 The values given in SI units are to be regarded as the
5. Reagents
standard.
1.3 This standard does not purport to address all of the 5.1 See Test Method D2868.
5.2 See Test Method D3495.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.3 See Test Method D2876.
priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 Follow the procedure for Test Method D3495. Save
2. Referenced Documents
extracted leather and follow the procedure in 7.1 only of Test
2
2.1 ASTM Standards: Method D2876.
6.2 When 1 L has been collected, cool the litre flask with
D2868 Test Method for Nitrogen Content (Kjeldahl) and
Hide Substance Content of Leather contents to room temperature, readjusted up to 1 L with
distilled water and mixed thoroughly. Transfer 500 mL of the
D2876 Test Method for Water-Soluble Matter of Vegetable-
Tanned Leather solution to an 800-mL Kjeldahl flask. If using automated
Kjeldahl instrumentation, sample size and quantity of reagents
D3495 Test Method for Hexane Extraction of Leather
D3790 Test Method for Volatile Matter (Moisture) of may need adjustment. Add8gof digestion catalyst (see Test
Method D2868) and 20 mL of sulfuric acid (specific gravity
Leather by Oven Drying
2.2 Federal Standard: 1.83) to the solution and the contents of the flask mixed
Federal Test Standard No. 311, Method 6452 Nitrogen, thoroughly.
3
6.3 Digest the mixture over a low heat source until all
Water Extractable
organic matter is oxidized as indicated by the end of foaming
3. Significance and Use
and clearing of the solution. When foaming has ceased and the
3.1 This test method provides the means to determine solutionhascleared,applyfullheattothemixtureandcontinue
nitrogen containing water extractable materials such as excess digestion for a minimum of 1 h. After digestion is complete,
and loosely bound tannins, ammonium salts, and nitrates. remove the flask from the heat, and allow to cool to room
temperature.Thenadd25mLof8 %sodiumthiosulfateandset
aside the flask for 5 to 10 min with occasional stirring.
1
6.4 Follow distillation and titration procedure in 7.3 of Test
This test method is under the jurisdiction ofASTM Committee D31 on Leather
and is the direct responsibility of Subcommittee D31.06 on ChemicalAnalysis.This
Me
...

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