Irrespective of the coating method, column stability depends on the stability of the stationary phase film which depends on the constant nature of the surface tension forces that hold it to the column wall. These surface tension forces can be reduced with an increase in temperature or by the solutes passing through the column.
Courtesy of Supelco, Inc.
| 1/ Dichlorodifluoromethane | 18/ Bromodichloromethane |
| 2/ Chloromethane | 19/ 2-Chloroethyl vinyl ether |
| 3/ Vinyl chloride | 20/ cis-1,3-Dichloropropene |
| 4/ Bromomethane | 21/ Toluene |
| 5/ 1,1-Dichloroethylene | 22/ trans-1,3-Dichloropropene |
| 6/ Methylene chloride | 23/ 1-Chloro-2-bromopropane |
| 7/ trans-1,2-Dichloroethylene | 24/ 1,1,2-Trichloroethane |
| 8/ 1,1-Dichloroethane | 25/ Tetrachloroethylene |
| 9/ cis-1,2-Dichloroethylene | 26/ Dibromochloromethane |
| 10/ Chloroform | 27/ Chlorobenzene |
| 11/ Bromochloromethane | 28/ Ethylbenzene |
| 12/ 1,1,1-Trichloroethane | 29/ Bromoform |
| 13/ Carbon Tetrachloride | 30/ 1,4-Dichlorobutane |
| 14/ Benzene | 31/ 1,1,2,2-Tetrachloroethane |
| 15/ 1,2-Dichloroethane | 32/ 1,3-Dichlorobenzene |
| 16/ Trichloroethylene | 33/ 1,4-Dichorobenzene |
| 17/ 1,2-Dichloropropane | 34/ 1,2-Dichlorobenzene |
Figure 18. The Separation of Volatile Priority Pollutants
As a consequence, the film can suddenly break up. Thus, it would be highly desirable if the stationary phase was bonded to the column walls or polymerized in situ. Such coatings are called immobilized stationary phases and can not be removed by solvent washing.
