Discussion
WCOT, PLOT are example of :
Answer: B
WCOT and PLOT are examples of tubular columns, the open tubular (capillary) columns of gas chromatography.
In a WCOT (wall-coated open tubular) column, a thin film of liquid stationary phase coats the inner wall of a fused-silica capillary. In a PLOT (porous-layer open tubular) column, the wall is coated with a layer of porous solid adsorbent. A third type, SCOT, has a support-coated wall. All have an open centre through which the carrier gas flows.
They are column designs, not peak shapes or injection ports, and UPLC is a liquid chromatography technique with packed columns.
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