Fast-Sep Cation

The separator column introduced as the Fast-Sep-Cation has similar physical properties. This column was developed primarily for the fast separation of alkali or alkaline-earth metals. In combination with a column switching technique, it is also suitable for the simultaneous analysis of the most important cations of both compound classes (see... 

Fig. 3-132. Separation of alkali metals on a latex cation exchanger. - Separator column Fast-Sep Cation I chromatographic conditions see Fig. 3-129.

Section 3.4.4). The dimensions of the Fast-Sep-Cation column are 250 mm x 4 mm I.D. Compared to the CS3 column, the 13-pm particle diameter of the substrate is slightly higher. The sulfonated latex beads are crosslinked with 4% DVB and have a diameter of about 225 nm. 

Fig. 3-146. Simultaneous analysis of alkali and alkaline-earth metals by means of column switching. - Separator column Fast-Sep Cation I and II switching time 0.5 min eluent 0.02 mol/ L HC1 + 0.0002 moI/L 2,3-diaminopropionic acid flow rate 2 mL/min detection suppressed conductivity injection volume 50 pL solute concentrations 1 ppm lithium (1), 4 ppm sodium (2), 8 ppm ammonium (3), 4 ppm potassium (4), 4 ppm magnesium (5), and 20 ppm calcium (6).

Corporation, are called nanobead-agglomerated cation exchangers. Their structure is schematically depicted in Figure 4.36. However, separator columns such as lonPac CSS and Fast-Sep Cation, which were manufactured using to this methodology, are no longer available. 

The separator column introduced as the Fast-Sep Cation has similar physical properties. This column was developed primarily for the fast separation of alkali-or alkaline-earth metals. In combination with a column-switching technique, it is also suitable for the simultaneous analysis of mono- and di-valent cations (see Section 4.4). However, in terms of separation power and peak efficiencies, the separations obtained in this way are inferior to those obtained with carboxylate-based weak acid cation exchangers (described in Section 4.1.1). The dimensions of the Fast-Sep Cation column are 250 mm X 4 mm i.d. The 13-pm particle diameter of the substrate is slightly higher than that of the CS3 column. The sulfonated latex beads are cross-linked with 4% DVB and have a diameter of about 225 nm. 

The electron transfer from oxygen to the sarcophaginate cation (Reaction (134)) is the rate-determining stage. The next fast step may be either the oxidation of [Co(sep)] + cation with the superoxide radical (Reactions 136 and 137) or disproportionation (Reaction 138). 

FIGURE 7.2 Fast gas chromatography analysis of a lime essential oil on a 5 m x 5 mm (0.05 pm Im thickness) capillary column, applying fast temperature programming. The peak widths of three components are marked to provide an illustration of the high ef ciency of the column, even under extreme operating conditions (for peak identi cation, see Ref. [50]). (From Mondello, L. et al., 7. Sep. Sci., 27, 699, 2004. With permission.)... 

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