Abstract: Ozone - initiated crosslinked SE - 54 fused - silica capillary columns have been prepared and used in the separation of nitroorganic compounds . These com -pounds are used in explosives and propellants and are present in the waste water . This column has proved to be a highly thermostable .efficient one for the separation of the above mentioned compouds , and can easily be prepared as well. The results showed that the column can separate isomers of MNT , DNT and TNT at a very high speed .