SIMPLE METHOD FOR PREVENTING UNSUITABLE SOLVENTS FROM ENTERING GAS-CHROMATOGRAPHIC DETECTORS

A simple method for preventing unsuitable solvents and other substances from entering gas chromatographic detectors is described. A split vent was constructed by connecting the outlet of the column to the unused injector and the detector with a press-tight Y-splitter and two short capillary columns. Unsuitable solvents and other substances can be discharged through the unused injector by keeping the injector open for a few minutes. When the nut on the injector is tightened, all the effluent from the analytical column enters the detector. Use of this split vent can avoid or reduce the adverse effects of unsuitable solvents on the detector performance.