ASTM D1358-86(1995)e1

Standard Test Method for Spectrophotometric Diene Value of Dehydrated Castor Oil and Its Derivatives (Withdrawn 2003)

SCOPE
1.1 This test method covers the determination of the spectrophotometric diene value as a measure of the content of conjugated dienoic acids in dehydrated castor oil and its derivatives. Due to the high linoleic acid content in dehydrated castor oil and its derivatives, the absolute conjugated dienoic acid content cannot be determined by this test method.  
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
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. Specific hazard statements are given in Section 6.
WITHDRAWN RATIONALE
This test method covers the determination of the spectrophotometric diene value as a measure of the content of conjugated dienoic acids in dehydrated castor oil and its derivatives. Due to the high linoleic acid content in dehydrated castor oil and its derivatives, the absolute conjugated dienoic acid content cannot be determined by this test method.
Formerly under the jurisdiction of Committee D01 on Paint and Related Coatings, Materials, and Applications, this test method was withdrawn in December 2003 in accordance with section 10.6.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 31-Dec-1994
• Withdrawal Date: 14-Dec-2003
• ICS: 87.060.20 - Binders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications

Standards Content (Sample)

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
e1
Designation: D 1358 – 86 (Reapproved 1995)
Standard Test Method for
Spectrophotometric Diene Value of Dehydrated Castor Oil
and Its Derivatives
This standard is issued under the fixed designation D 1358; 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.
e NOTE—Unit of measurement statement and Keywords were added editorially in May 1995.
1. Scope 4. Apparatus
1.1 This test method covers the determination of the spec- 4.1 Spectrophotometer—Ultraviolet photoelectric spectro-
trophotometric diene value as a measure of the content of photometer, covering a spectral range from 200 to 350 nm,
conjugated dienoic acids in dehydrated castor oil and its with a wavelength scale readable to 0.1 nm, and equipped with
derivatives. Due to the high linoleic acid content in dehydrated an absorption cell compartment for holding 10.00-mm cells.
castor oil and its derivatives, the absolute conjugated dienoic 4.2 Absorption Cells, quartz, matched pairs of lengths 10.00
acid content cannot be determined by this test method. 6 0.05 mm. The cells in a pair, when filled with water or
1.2 The values stated in SI units are to be regarded as the isooctane, shall match within 0.01 absorbancy unit (Note 1).
standard. The values given in parentheses are for information The cells may be the 10.00-mm nondemountable type made of
only. quartz, or the demountable type consisting of a chemically
1.3 This standard does not purport to address all of the resistant glass cell body of outside diameter of about 22 mm
safety concerns, if any, associated with its use. It is the with centered-ground glass stopper, threaded metal caps, pol-
responsibility of the user of this standard to establish appro- ished crystalline quartz windows, and cork gaskets.
priate safety and health practices and determine the applica-
NOTE 1—If the cells do not match within 0.01 absorbancy unit, they
bility of regulatory limitations prior to use. Specific hazard
may be filled with water or isooctane and calibrated against each other at
statements are given in Section 6.
the specified wavelength. The necessary correction in absorbancy units is
then applied where necessary. Highest precision is obtained by the method
2. Terminology
of reversing cells. The absorbancy of the solution is read against the
solvent blank. The cells are then cleaned and the solvent blank put in the
2.1 Description of Term Specific to This Standard:
cell previously used for the solution and the solution in the cell previously
2.1.1 spectrophotometric diene value—under the conditions
used for the blank and the absorbancy measured. The two absorbancies are
of this test method, the percent of conjugated dienoic acids.
then averaged to obtain A , the observed absorbancy. The cells should be
s
rinsed with solvent, water, concentrated nitric acid, water, and solvent, in
3. Significance and Use
that sequence, before each reading.
3.1 In the process of dehydrating castor oil, a double bond
4.3 Filter Tube, 810 by 45 mm (32 by 1 ⁄4 in.).
is formed in the ricinoleic acid to make either conjugated
4.4 Cork Stopper covered with aluminum foil to fit loosely
linoleic or normal linoleic fatty acid segments in the oil. This
in the top of the filter tube.
test method attempts to measure the amount of conjugated
4.5 Dropping Bottle, stoppered, for weighing the samples.
unsaturation by means of the absorbance at a specific wave-
4.6 Volumetric Flasks, glass-stoppered, having capacities of
length which is in the ultraviolet range. Since some absorption
100 mL, 50 mL, and 25 mL.
is due to linoleic acid, a correction factor is included in the
calculation. This test method is only applicable to dehydrated
castor oil products.
The Beckman Model DU photoelectric quartz spectrophotometer, Catalog No.
2500 DU, Beckman Laboratories, S. Pasadena, CA, has been found satis-
factory for this purpose.
The cell compartment assembly, as Catalog No. 2510, and the ultraviolet
This test method is under the jurisdiction of ASTM Committee D-1 on Paint accessory set, as Catalog No. 2501, that includes the No. 2230 hydrogen discharge
and Related Coatings, Materials, and Applications, and is the direct responsibility of lamp, the No. 2511 adapter, No. 23-10-10-89 cells, and No. 2504 cover, both
Subcommittee D01.32 on Drying Oils. available from Beckman Laboratories, S. Pasadena, CA, have been found satis-
Current edition approved March 27, 1986. Published May 1986. Originally factory for this purpose.
1 4
published as D 1358 – 55 T. Last previous edition D 1358 – 58 (1984)e . Borosilicate glass has been found satisfactory for this purpose.
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