Preparation of the Phosphate Modified Charcoal Self-assembled PLOT Capillary Column for Gas-Solid Chromatography

A simple method for the preparation of submicron charcoal PLOT columns using fused silica capillaries by means of self assembled monolayerstechnology was reported. These columns were deactivated with K₃PO₄, K₂HPO₄ and KH₂PO₄ respectively, the retention behavior of the columns were evaluated, and used to separate inert gases and light hydrocarbons. The optimal range of pore size of charcoal particles used to prepare PLOT column was considered as 0.5～0.7 μm, the fitter conditional temperature and the favourable concetration of phosphate used to deactivate charcoal was 250℃ and 1.5% respectively.