CHEMISTRY :
Chromatography
Choice of Solvents and their properties
PROJECT CODE: |
04.01i |
SECTION: |
CHROMATOGRAPHY |
PROJECT TITLE: |
SUMMARY OF RESULTS FOR SOLVENTS USED in Paper Chromatography |
RELEASE DATE: |
07 Feb 99 |
LAST UPDATE: |
2 Sep 2009 |
VERSION HISTORY: |
1.0 - First release
1.1 - Revision of text and formatting. (2-Sep-2009)
|
LIST OF SOLVENTS USED
- 65% METHANOL (120 minutes) - (click to view individual result)
- 60% ETHANOL ( 120 - 150 minutes) - (click to view individual result)
- *BUTANOL ( 90 minutes ) - (click to view individual result)
- *CARBON TETRACHLORIDE ( less than 40 minutes) (click to view individual result)
- *CHLOROFORM (less than 40 minutes) (click to view individual result)
- 60% METHANOIC ACID (90 minutes ) (click to view individual result)
- 60% PROPANONE ( 100 minutes) (click to view individual result)
Percentages show the dilution of the solvent with water.
* These solvents cannot be diluted with water since they are immiscible.
To view the miscibility chart for the solvents mentioned above - click here
Preparation of 60% and 65% mixtures:
60% : 3 vols. solvent + 2 vols. water Eg: 3.0ml + 2.0ml ==> 5ml mixture
65% : 13 vols. solvent + 7 vols. water Eg: 6.5ml + 3.5ml ==> 10ml mixture
TABLE OF RESULTS FOR SOLVENT CHARACTERISTICS
Solvent Name |
Flow Time (mins) |
Speed of flow |
Solubility score (0-10) |
Separation score (0 - 10) |
Overall Score (%) (i) |
60% Propanone |
120 |
Moderate |
10 |
9 |
97% |
60% Ethanol |
140 |
Slow |
9 |
9 |
90% |
60% Methanoic acid |
90 |
Fast |
7 |
8 |
82% |
65% Methanol |
120 |
Moderate |
6 |
8 |
68% |
Abs. TetraCl.Methane |
100 |
Quite Fast |
7 |
3 |
40% |
Abs. Butanol |
80 |
Fast |
9 |
0 |
20% |
Abs. Chloroform |
40 (ii) |
Moderate |
9 |
0 |
15% |
- Scores are given in relation between the various types solvents used and are different from the scores given in the individual solvent tests. In the latter, the scores were in relation between the different concentrations of the same solvent.
- For chloroform, 40 mins does not indicate that this is a fast solvent, but simply 40mins is the ideal time to be used
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