Journal of Agricultural Research . Scale. hI: Aflh^- A Transmit-tancy. O. 0799O. 0460 o. 1492o. 0970 o. 1175o. 0654 Dilution. 20 X20 X 200 X200 X 500 X500 X Carotindetermined per liter, using graphs in figure a. Mgm. i,335-o1,380. o The data of this table should not be correlated with those of other tables. Der. 1,1923 Quantitative Determination of Carotin 391 Quantitative determinations were made on three solutions (A, B, andC) of different concentrations. These are recorded in Table III. Theresults obtained are concordant indicating that either the Hg. or He. linemay be u
Journal of Agricultural Research . Scale. hI: Aflh^- A Transmit-tancy. O. 0799O. 0460 o. 1492o. 0970 o. 1175o. 0654 Dilution. 20 X20 X 200 X200 X 500 X500 X Carotindetermined per liter, using graphs in figure a. Mgm. i,335-o1,380. o The data of this table should not be correlated with those of other tables. Der. 1,1923 Quantitative Determination of Carotin 391 Quantitative determinations were made on three solutions (A, B, andC) of different concentrations. These are recorded in Table III. Theresults obtained are concordant indicating that either the Hg. or He. linemay be used. THE EFFECT OF SOI^VENTS UPON TRANSMITTANCY; TRANSMITTANCY OF A SOLUTION OF PURE CAROTIN Often, it is convenient to have the carotin dissolved in petroleumether or alcohol instead of ether and, consequently, some knowledge ofthe influence of these three solvents upon the transmittancy seemeddesirable. The solutions were made as follows: There were ragm. of carefully purified carotin in 250 cc. of petroleum Fig. 3.—Comparison of graphs of the transmittancies of identical concentrations of carotin in petro-leum ether, alcohol and ether, using the mercurj^ line Of this solution cc. were then diluted to 50 cc. with petroleumether, ether, or alcohol, and all further dilutions were made with thesame respective solvents.^ It will be noted that the ether and alcoholsolutions contain small percentages of petroleum ether. The results aregiven in Table IV and are plotted in Figure 3. In Figure 3 the effect of the solvents is seen. The ethereal solutionof carotin transmitted somewhat less light than did the alcohol or thepetroleum ether solution. The graphs for the petroleum ether and thealcohol solutions coincide. Since the results (Table IV) for ether wereobtained from two different weighings and preparations of carotin andchecked within the limits of error, they have been used as the basisfor quantitative determinations. To check the accuracy of th
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