Abstract
To develop the purification method for high accuracy and rapid analysis of dioxins, this study investigated the purification effects by heating chemical impregnated silica gel columns, i.e., AgNO3 silica gel and H2SO4 silica gel. Removal effects of contaminants in crude solutions from flue gas and sediment treated with AgNO3 silica gel at 60°C were highly efficient for sulfur compounds, but not for polycyclic aromatic hydrocarbons compared with those at room temperature (24±2°C ) . Purification by heating H2SO4 silica gel at 60°C was excellent in monoand poly-aromatic hydrocarbon compounds, and their removal effects were so far better than those at room temperature. In the case of chemical impregnated multilayer silica gel column, i.e., AgNO3 silica gel/H2SO4 silica gel, the purification effects by heating at 60 °C were also highly efficient as compared to those at room temperature. These results indicate that the heating chemical impregnated multilayer silica gel column is useful for purification of sediment and biological samples enriched in sulfur compounds, and also for reduction of analytical time, amounts of solvents and contaminations in the capillary column and ionization spot.
