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What Is GC Column And Its Different Types

These types are more efficient than the packed Capillary GC Columns and they give high resolution. Low pressure is maintained by the capillary columns inside them.

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What Is GC Column And Its Different Types

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  1. What Is GC Column And Its Different Types? A gas chromatography column is very popular and its stationary phase is being coated on its inner surface. For the chromatography, process columns require a smaller amount of sample and are preferred over the packed variant. The size of the column comes with a diameter. The Capillary GC Columns are mainly divided into two parts:

  2. • WCOT WDCOT stands for wall-coated open tubular columns and comes with a liquid stationary phase which is coated inside the walls. • SCOT SCOT stands for support coated open tubular columns and doesn't require a direct coating of stationary phase on the walls. On the walls of the columns, there is a support material and the stationary phase gets absorbed by the material. As compared to the WCOT type of capillary columns the support material in SCOT usually decrease its efficiency.

  3. These types are more efficient than the packed Capillary GC Columns and they give high resolution. Low pressure is maintained by the capillary columns inside them. GC packed column Packed column GC is another popular type of column here. The fine particle phase is entirely packed inside it and this factor makes it different from the previous variant. To conduct gas chromatography successfully requires a large number of samples so that's why most experts prefer capillary columns. The pressure inside the column is maintained at a high value due to the fully packed stationary phase. As compared to the capillary column the length is shorter but the diameter goes up to several millimeters. The stationary phase is available in solid and liquid form and fine particles are present in the column. In the liquid state, the fine particles are well coated with a liquid. These columns are highly efficient to separate lighter gases and their latest variant is less expensive.

  4. How to choose GC Columns The selection of the GC column is quite confusing but your choice can be based on general consideration: • Sample size There is no need for large sample injections as detectors come with high sensitivities so the capillary column is the best choice in that case. But packed columns have higher sample load capacities so if detector sensitivity is low choose packed columns. • Cost As compared to capillary column packed columns are less expensive. These have lower resolution efficiencies and large GC column bleed in comparison to capillary columns.

  5. • Ruggedness It is important to take care of the metallic columns as they are rugged and can tolerate all types of handling. This can affect the separation power inside the column. But the glass-packed columns have zero flexibility and require careful handling. At the time of installation, capillary columns require careful handling as they are fragile. Capillary columns offer almost all the desirable features required by gas chromatographer. SOURCE https://quadrexcorp.mystrikingly.com/blog/what-is-gc-column-and-its-different-types

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