Carbowax column surface deactivation using

Carbowax 20M has also been successfully used to deactivate column surfaces (84,85). After coating a thin film of Carbowax 20M, for example, on the column wall, the column is heated to 280°C, then exhaustively extracted with... 

Carbowax 20M has also been used successfully to deactivate column surfaces (50,51). After coating a thin film of Carbowax 20M, for example, on the column wall, the column is heated to 280°C, then extracted exhaustively with solvent, leaving a nonextractable film of Carbowax 20M on the surface. Both apolar and polar stationary phases, including Carbowax, can then be coated on capillaries subjected to this pretreatment (52). Dandeneau and Zerenner used this procedure to deactivate their first fused-silica columns (4). Other polyethylene glycols used for deactivating purposes have been Carbowax 400 (53), Carbowax 1000 (54),... 

In a series of papers, Lee and coworkers described the use of pentafluorobenzyl bromide as derivatization agent for the determination of 22 phenols in water samples [83,84]. Before derivatization, the phenols were extracted from the water sample into dichloromethane. In the first paper, six different columns were tested, and the OV-101 fused silica capillary column with Carbowax-deactivated surface was found to give the most efficient separation [83]. Detection was carried out using both the BCD and MS. A similar approach, using derivatization with pentafluorobenzyl chloride and BCD, was described for the analysis of monochlorinated and brominated phenols in aqueous samples [85]. 

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