Columns dynamic coating

Open tubular columns can be coated internally with the appropriate stationary phase dissolved in a suitable solvent, or, alternatively, with monomeric materials that are subsequently polymerized to form a relatively rigid polymer film on the column walls. There are two basic methods for depositing the stationary phase as a surface film on a capillary column, dynamic coating and static coating, the latter being the most commonly used. 

Factors Controlling Selectivity Open Tubular Columns Dynamic Coating Static Coating Column Regeneration Capillary Column Design and Choice Stationary Phases for the GC Separation of Chiral Substances Synopsis References Chapter 6... 

Compared to wall-coated columns, dynamically coated SCOT columns have higher capacity ratios. 

Poole, S. K., Patel, S., Dehring, K., Workman, H., Dong, J. Estimation of octanol-water partition coefficients for neutral and weakly acidic compounds by microemulsion electrokinetic chromatography using dynamically coated capillary columns. J. Chromatogr. 

Carbowax 20M, polysiloxanes, and N-cyclo-3-azetidinol are the most widely used sutetances for the thermal degradation method [143,180,192-194]. In the case of the Carbowax treatment deactivation can be carried out in either of two ways. The column can be dynamically coated with a solution of Carbowax 20H in a volatile solvent, excess solvent evaporated with a stream of nitrogen, the column ends sealed and the column heated at about... 

FIGURE 14.9 Separation of Mn(II), Zn(II), Cd(II), and Pb(II) using (a) a dynamically coated and (b) a pre-coated MTB ODS reversed-phase column. (From Pauli, B. and Haddad, P.R., Trends Anal. Chem., 18, 107, 1999. Copyright 1999. With permission from Elsevier.)... 

Fig. 5.1. Separation of chlorophenol acetates (2-0.02 ng). Peaks 1 = 2-chloro 2 = 3-chloro 3 = 4-chloro 4 = 2,6-dichloro 5 = 2,5-dichloro 6 = 2,4-dichloio 7 = 3,4-dichloro 8 = 2,3-dichIoro 9 = 3,5-dichloro 10 = 2,4,6-trichloro 11 = 2,4,5-trichloro 12 = 2,3,4,6-tetrachloro 13 = pentachloro-phenol acetates. Conditions Pyrex glass column (25 m X 0.35 mm I.D.), dynamically coated with SE-30 temperature programme, 3°C/min (95-180°C) helium flow-rate, 2-3 ml/min splitting flow-rate, 0-60 ml/min. (Reproduced from J. Chromatogr. 131 (1977) 412.)...

Columns for LLPC are prepared by using solvent evaporation, direct coating, precipitation, or a dynamic coating technique [3], In the solvent-evaporation technique, the nonvolatile hquid stationary phase is dissolved in a volatile solvent and mixed with the dry sup-... 

R. M. Cassidy and S. Elchuk, Dynamically coated columns for the separation of metal ions and anions by ion chromatography, AnaZ. Chem. 54 1558 (1982). 

Akatsuka, K., Yoshida, Y., Nobuyama, N., Hoshi, S., Nakamura, S. and Kato, T., 1998, Preconcentration of Trace Cadmium from Seawater Using a Dynamically Coated Column of Quaternary Ammonium Salt on C18-bonded Silica Gel and Determination by Graphite-furnace Atomic Absorption Spectrometry , Analytical Sciences, 14, 529-533. 

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