Summary
The constractional details of precolumns, its oven and connector have been given with two types of multiflow control modules. Two types of phases made in China, a silanized pellicular beads and a non silanized pellicular silica beads, with an optimum particle size of 20μm to 30μm were packed in the precolumn 20mm in length with the column efficiency of 4620 plates/meter at column temperature of 49°C. A 25m×0.22mm i.d. capillary column coated with bonded methylsilicone phase from Chrompack connected with the precolumn (250°C) has an efficiency of 5376 plates/meter for n-octane. But it decreased to 3149 plates/meter by decreasing the precolumn temperature to 130°C.
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Tong, D., Xu, F. & Lu, P. A new type of two-dimensional packed+capillary column GC system. III. Instrumentation. Chromatographia 23, 499–501 (1987). https://doi.org/10.1007/BF02309418
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DOI: https://doi.org/10.1007/BF02309418