Active surface sites and deactivation of chromosorb 102

Add time:08/23/2019    Source:sciencedirect.com

A combined infrared spectroscopic and chromatographic study was undertaken in order to determine the adsorption properties of Chromosorb 102. This study shows that the unreacted vinyl groups in Chromosorb 102 are the active sites which give rise to extreme tailing of amine peaks when the material is used as a support material. A method was devised for removing these groups chemically by addition of HF to the double bond of the vinyl group. This method of deactivation is not dependent on the surface area of the support or on the amount of reagent used, as is the case in the deposition methods. The spectra obtained allow one to observe the interactions with the surface and enable one to predict which compounds give rise to extreme tailing in a chromatographic column. The predictions made were confirmed by running the test substances in a gas chromatograph containing support materials treated with HF, coated with Carbowax 20M, and untreated.

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