Separator column OmniPac PAX

Figure 6.61 Selectivity comparison between ion-exchange chromatography (a), ion-pair chromatography (b), and the combination of both on a mixed-mode phase (c). Separator columns OmniPac PAX-100, lonPac NS1, and OmniPac PAX-500 eluent 42 mmol/L NaOH...

C,8 ion suppression separator coiumn chemically bonded silica (ODS) eiuent 20mmoi/L H3PO4-i-20mmol/L HOAc/MeCN gradient linear, 5% MeCN to 30% in 20 min (b) mixedmode separator column OmnIPac PAX-500 eluent KOH/KCl/MeCN (80 20 v/v) gradient linear, 0.5 mmol/L KOH + 50 mmol/L KCI to... 

Fig. 7-54. Separation of a leachate extract on a multimode phase utilizing UV detection (A) and particle-beam mass spectrometry (B) in the El mode. - Separator column OmniPac PAX-500 (250 mm X 2 mm i.d.) flow rate 0.25 mL/min eluant NaOH -acetonitrile gradient linear, 9 mmol/L NaOH-ACN (90 10 v/v) to 50 mmol/L NaOH-ACN (80 20 v/v) in 8 min, then to 80 mmol/L NaOH-ACN (73 27 v/v) in 5 min, then to 120 mmol/L NaOH-ACN (60 40 v/v) in 5 min detection (a) UV (254 nm), (b) PBMS, Ei mode injection volume 5 pL (taken from [114]).

Fig. 9-153. Separation of typical organic additives used in refreshers. - Separator column OmniPac PAX-500 eluant ...

Figure 6.65 (a and b) Comparison of ion-pair and mixed-mode selectivities exempiified with the separation of phenylphosphonate and aromatic sulfonic acids, (a) Cis ion-pair separator column chemically bonded silica (ODS) eluent 4 mmol/L H3PO4 -I-10 mmol/L tetrabu-tylammonium phosphate (pH 7.5)/MeCN gradient linear, 25% MeCN to 60% in 20 min (b) mixed-mode separator coiumn OmniPac PAX-500 eiuent KOH/KCi/MeCN (75 25 v/v) ... 

Fig. 7-48. Separation of chromium(lll)/chromium(VI) with element-specific detection. - Separator column 50 mm X 4 mm i.d. OmniPac PAX-100 eluant 0.1 mol/L HNO3, pH 2 with NH4OH flow rate ...

Recently, Talamond et al. [257] published a procedure for determining phytic acid in foods that involves anion exchange chromatography and suppressed conductivity detection and, thus, avoids post-column derivatization. Separation is carried out with an OmniPac PAX-100 using a NaOH gradient in the presence of 1 % (v/v) 2-propanol. The ASRS-1 suppressor is chemically regenerated with 25 mmol/L sulfuric acid. 

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