Low dead volume union

Unions can also be a serious source of dispersion, depending on their design. Today, low dead volume unions are generally available which exhibit reduced dispersion... 

Unions can also be a serious source of dispersion, depending on their design. Today, low dead volume unions are generally available which exhibit reduced dispersion characteristics but, again, actual data reporting their dispersion do not appear to be readily available. Scott and Simpson also measured the dispersion that occurred in normal unions and drilled-out unions. Drilled-out unions allow the ends of the... 

Injector type cool on-odumn. A section of deactivated or polymethylsiloxane coated 0.53 mm ID fused silica tubing can be connected between the Injector and the column with a low dead volume union to allow use of an on-column autosampler... 

End-column detection is done by coupling the outlet of the capillary to an external detection cell. The properties of this detection cell (path length, material, etc.) can be tailored to allow for high sensitivity and low analyte limits of detection. The careful selection of coupling and transfer fluidics, such as zero dead-volume unions, ensures that the high resolution afforded by CE is maintained within the end-column detector. 

Vu-Union. The primary and secondary sealing mechanisms in a capillary Vu-Union is shown in Figure 3.57, where the two column ends are positioned into ferrules located inside a deactivated tapered glass insert. This type of connector combines the benefits of a low-dead-volume connection with the sturdiness of a ferrule seal. Furthermore, the glass window permits visual confirmation of the connection. 

Stainless-steel tube (500 X 2.1 mm I.D.) fitted at the column outlet with a 2-pm filter union at low dead volume... 

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