THEORETICAL INVESTIGATION ON THE NEW-TYPE 2-DIMENSIONAL PACKED-CAPILLARY COLUMN GC SYSTEM - EFFECT OF THE COLUMN CONDITIONS ON RETENTION TIME AND PEAK SPREADING

In this paper, the first moments of the peaks eluted from a two-dimens ional packed-capillary column GC system were derivde by means of chrom atographic dynamics, Based on this expression, the effect of the preco lumn temperature, the precolumn pressure and the split ratio on the re tention time and the peak spreading were discussed, The results showed that split stream was a bridge between the main column and the precol umn, the split ratio was an important factor affecting the retention t ime and the peak spreading, Because the retention period of the solute in precolumn was shorter, the effect of the change of the precolumn c ondition on retention time was smaller if the main column condition wa s,fixed, The higher the temperature of precolumn and the more narrow t he peak, and the pead profile could be improved in a regular scope by the change of the split ratio between the two column. In accordance wi th the relationship between the main column and precolumn, some specia l rules were observed in the two-dimensional packed-capillary column G C system.