Abstract
Desorption introduction of volatile organic air pollutants collected on polymer beads adsorbent was investigated for a capillary gas chromatograph. When carrier gas is used to introduce a desorbed sample to a capillary column by split method, a large portion of the sample is purged from the split vent together with splitted carrier gas, and so analysis of less amount components in the sample are not suitable for split capillary column gas chromatograph, although separation ability of a capillary column is better than that of a packed column. For this reason, splitless introduction method is required for desorption analysis of trace amount of organic air pollutants.
In this paper, a splitter with a stop valve before the split gas exit was used for splitless introduction of desorbed sample from Tenax GC collectors. When the stop valve is closed and the head pressure of the column is raised to about 4kg/cm2, splitless desorption introduction is carried out under a condition of 20ml/min flow rate and-40°C column temperature, and then the stop valve is opened to recover the optimum column flow rate (3.4ml/min for 0.31mm i.d. column) and elution is started by raising the column temperature. In this method desorption is almost complete and column flow rate is optimized, and the column efficiency is relatively high.
