FACTORS AFFECTING ZONE VARIANCE IN A CAPILLARY-FLOW INJECTION SYSTEM

Dye dispersion studies are reported to characterize zone variance in a capillary now injection system. Variance sources are compared with si milar sources in a conventional now injection system, The inside diame ters of the reactors in the capillary and conventional systems were 64 mu m and 0.5 mm, respectively. In both systems, reactor length, detec tor now cell volume, and injection volume are the major contributors t o the total zone variance, The individual contributions of each varian ce source were determined. Results show that, in a single-line capilla ry system, the majority of the peak variance is due to extracolumn eff ects, However, in the conventional system, the reactor was found to be the major contributor to the overall zone variance. Implications of t hese findings to the development of improved capillary now injection s ystems are discussed.