Abstract
The relative contributions of partition and adsorption to the retention volume were determined for polar solutes on a non-polar stationary phase ( n-octadecane) coated on differently treated diatomeceous supports: acid-washed; cleaned with gaseous HCl at high temperatures; silanized; and polymer-coated with Carbowax 20M. Supports which were only cleaned with gaseous HCl showed high adsorption. The silanized support had intermediate adsorption and wettability properties. The extent of wetting was dependent on the procedure for cleaning the initial support. The Carbowax-modified support was very inert, the adsorption effects were negligible and the wettability by the stationary phase very poor. Thus Carbowax-modified supports, owing to low adsorptivity and poor wetting (which in this case minimizes gas-liquid interface adsorption), are well suited to the analysis of polar compounds. Additionally, such supports should be of great value for physico-chemical measurements. The impairment of efficiency due to poor wetting seems to be of minor importance.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
