ANALYTICAL CONSTANTS OF LINSEED O I L .
29
that the presence of water either of the bromine or the oil is apparently of no influence. T h e results obtained vary with each calorimeter; hence to make them comparable they must, as in Maumene test, be referred to some standard. Such a standard has been found in sublimed camphor, which can be prepared in sufficient purity ; seven and five- tenths gram are dissolved in carbon tetrachloride and brominated, giving an average rise of 4.2'. T h e rises in temperature obtained with the various oils were divided by this number, giving a specific temperature reaction ; if this be multiplied by a factor-found by dividing several of the iodine numbers by this specific temperature- the iodine of value any sample may be quite closely determined ; this is shown in the following table, the factor being 1 7 . 1 8 . TABLESHOWING THE RELATION O F TH& BROMINATIONAND IODINE VALUES. Name of oil.
Spec. temp. Keaction.
................3.286 .................... 3.348 ............... 3.7'5 ................... 4.191 ................ 4.096 ..................... 4.762 ................ 5.667 ...................... 6.381 ....................... 8.002 .................. 9.949 ................ 1.643 ............. 1 . 1 9
Jodine. Calculated. Found.
Neats-foot Tallow Prime l a r d . . Sperm.. No. I l a r d . . Olive. Cottonseed Corn Cod Linseed 250 paraffin 3000 l a n t e r n . .
53.5 57,4 63.8 72. I 70.3 81.8 97.3 109.5 137.4 152.6 18.2 50.5
59.1 57.2 63.8 73.2 73.9 82.0 103.0 107.8 135.0
160.0 10.1 0.0
In the case of the hydrocarbon oils the discrepancy may be due to the fact that there is substitution by the dromine and and none with the iodine. MASS.INSTITUTE OF TECHNOLOGY, October, 1898.
T H E ANALYTICAL CONSTANTS OF AMERICAN LINSEED OIL. BY AUGUSTUS H. GILLA N D AUGUSTUS
c. L A M B .
Received October 5 , 1898.
G
E N U I N E samples of linseed oil having been found to yield lower iodine values than were usally excepted, it seemed desirable to determine the constants of some American oils of undoubted purity.
30
ANALYTICAL CONSTANTS O F LINSEED OIL.
Nearly all the principal brands in the market were represented, being obtained from leading manufacturers in the east and west, whom we here wish to thank for their courtesy. T h e methods employed were those in common use, described at length in a little book by one of us ;’ it was found necessary in applying the MaumenC test to mix the linseed oil thoroughly with a heavy petroleum and allow to stand an hour or two before the treatment ulith sulphuric acid, correcting for this in the rise obtained. T h e results are given in the accompanying table and are the mean of two closely agreeing determinations. COXSTAXTSOF LINSEEDOIL.
.--2.
9 a
-
”.
Brand.
29 50
z2
I. 2.
Western raw
............. 0,933
..
...... ............. .............
3. (‘ special 0.934 4. Old Calcutta 0.931 5. Eastern o i l . . 0.931 6 . Western boiled ........... 0.936 7. Eastern . . . . . . . . . . . . .0.938
8. Acid bleached ............ 0.934 9. Bleached TI-ithout acid.. ... 0.932 IO.
............ 0.934 ..........0.931-0.937 Average ........ 0.934
Menhaden oil
Usual constants
‘2
8&,. a 0
2
g
2.32
>
qy 97 90 roj 106 roj
79 70 73 71.5 73 74 59.5 52.5 60
. . . . . . . . . . . . . . . . .0,932
a; &::
* d
,w c:
eC,a
.u .-
73.5
c .
