The Removal of Linseed Oil Vapors by Biodegradation Page: 4
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in large proportion are preferred for making drying oils, while those
with oleic oils are less desirable. The avidity of fatty acids to cross
link upon oxidation leads to the "drying" of the film. The amount and
type of fatty acids determine the hardness and durability of the films
produced.
1.1.3. Iodine value
The iodine value is a measurement of the unsaturation of
oils and fatty acids and is expressed in terms of the number of
centigrams of iodine per gram of sample (weight per cent of absorbed
iodine). The determination of the iodine value of oils containing
double bonds is based on the absorption of halogen under constant
conditions (3).
HHP HHHH
-C-CC-C-C- + l2 _►
H H HI I H
The amount of iodine absorbed is determined by back titration of the
excess reagent with sodium thiosulfate (NaS203) and comparing this to
a blank determination. The iodine value (I) can be calculated as
follows:
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Sukplang, Patamaporn. The Removal of Linseed Oil Vapors by Biodegradation, thesis, August 1996; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc278809/m1/15/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .