What is fused silica capillary column?

Fused Silica Capillary Column Fused silica columns are narrow-bore capillary columns with a polymer stationary phase coated inside, a polyimide polymer coated outside, and a layer of fused silica between the two.

Which is an example of capillary column used in gas chromatography?

Capillary Column / Capillary GC Columns Capillary columns are gas chromatography (GC) columns that have the stationary phase coating their inner surfaces rather than being packed into the cavity. Capillary GC columns are used to analyze samples for the individual chemical compounds that they contain.

What is WCOT column?

Wall-coated open-tubular (WCOT): thin liquid film of stationary phase is coated on capillary wall. WCOT columns have lower capacity, but higher separation efficiency, than SCOT ones. To add strength, an outside polyimide coating is applied to the external capillary wall as the capillary tubing is being drawn.

Which gases are used in gas chromatography?

Carrier gas is an inert gas used to carry samples. Helium (He), nitrogen (N2), hydrogen (H2), and argon (Ar) are often used. Helium and nitrogen are most commonly used and the use of helium is desirable when using a capillary column.

Why are GC columns long?

A gas encounters less resistance in the GC column which permits use of longer column lengths. On the other hand samples entering the GC column are gases having lower molecular weights and boiling points. Such compounds are easily vaporized and remain as gases during passage through the column.

Which gas is not suitable for GC?

Nitrogen has only drawbacks and is not suitable for capillary GC. Helium is as good as hydrogen if inlet pressures are below about 50 kPa, but requires slower GC at higher inlet pressures (for longer columns), the difference being roughly a factor of two when 150-200 kPa must be applied for helium.

What is fused silica capillary column? Fused Silica Capillary Column Fused silica columns are narrow-bore capillary columns with a polymer stationary phase coated inside, a polyimide polymer coated outside, and a layer of fused silica between the two. Which is an example of capillary column used in gas chromatography? Capillary Column / Capillary GC Columns…