When measuring trace-level impurities, the sensitivity of the GC system needs to be optimized. If it is not, low-level compounds cannot be adequately distinguished from the baseline and accurate identification and quantification become difficult or impossible. Sensitivity is strongly influenced by column factors, including inertness and bleed. Rxi columns are the lowest bleed column available and improve trace-level detection by reducing background noise.<\/p>\n\n\n\n
All Rxi stationary phases are surface bonded via the interfacing deactivation layer. The deactivation layer has an important function in shielding any residual activity on the surface (Figure 1). Several types of stabilization groups can be used for minimizing stationary phase bleed (Figure 2). These stabilization groups reduce the degradation reaction of the siloxane polymers when the column is used at elevated temperatures, resulting in a much lower bleed column than other \u201clow-bleed\u201d columns on the market.<\/p>\n\n\n