Packed GC Columns

A GC column packed with a non-polar stationary phase gave the following retention times for a series of hydrocarbons ... 

Imagine that a polymer has been fully characterized and its free energy contribution coefficients for individual vapors A and B have been evaluated according to the LSER equation. If the polymer is fully saturated with vapor A, do you expect the coefficients for vapor B to be the same as for the polymer in the absence of vapor A Would the evaluation of the retention times for A and B on a GC column packed with the same polymer offer any help in such a case ... 

GC column-packed Porapak-QS (80/100 mesh), Chromosorb 101 (60/80 mesh), or equivalent capillary VOCOL, DB-624, Rtx-502.2, DB-5, SPB-5, or equivalent fused silica capillary column. 

GC column. Packed -3% SP-2250 on Supelcoport or equivalent fused silica capillary column such as DB-5, PTE-5, or equivalent. 

GC column packed column—10% OV-275 on 100/120 mesh Chromosorb W-AW, Porapak P 50/80 mesh, or equivalent. 

GC column (Packed) Molecular Sieve 5A or Carboxen 1004 micropacked or equivalent in stainless steel column. 

GC column packed glass column 3% Carbowax 20M on 80/100 mesh Chromosorb 101. Any appropriate polar column may be used. 

An isobutylene peak is observed after passage at 50°C through a GC column packed with Chromosorb W having a 15% by weight loading of dinonyl phthalate. The measured R value is 0.603 the measured Cs value is 0.0079 s. From porosimetry data the depth of DNP in the Chromosorb W pores is estimated as 3.50 x... 

Gas chromatograph, p. 575 GC columns— packed, capillary, p. 578 Stationary phases—polar to nonpolar, p. 581... 

Tenax TA and Tenax GC are a recently introduced porous polymeric material originally developed as a GCS column packing. It is hydrophobic and is excellent for adsorbing volatiles from the atmosphere at room... 

Alternative sorbents for the collection of polar organic compounds which are sensitive to hydrolysis are porous polymers such as the Chromosorb porous polymer column packings, Porapak porous polymer column packings, Tenax-GC column packing, and Amberlite XAD sorbent products. XAD-2 resin has been used for a number of compounds and, for example, has been shown valuable for the... 

There are two general types of GC column packed and capillary (also known as open tubular). Packed columns contain a finely divided, inert, solid support material (commonly based on diatomaceous earth) coated with a viscous liquid stationary phase. Most packed columns are 1.5-lOm in length and have an internal diameter of 2-4mm. The original glass capillary columns had an internal diameter of a few tenths of a millimeter and were also one of two types, wall-coated open tubular (WCOT) and support-coated open tubular (SCOT). WCOT columns consist of a capillary tube whose walls are coated with liquid stationary phase. In SCOT columns the inner wall of the capillary is lined with a thin layer of support material such as diatomaceous earth, onto which the stationary phase has been adsorbed. Both of these types of capillary column provide greater separation efficiency than packed columns, but since 1979 they have... 

A combined GC-MS is composed of a gas chromatograph, a mass spectrometer, and an interface [10,11]. Each of them can have many different variations. Almost all of the columns used in the GC analysis can be used in GC-MS. In early GC-MS applications, glass GC columns packed with various solid supports coated with liquid phase were used. The effluent from the column was introduced through a Jet or a membrane separator to the mass spectrometer ion source under vacuum (in the range of 10 to 10 torr). Capillary open tubular columns, first with stainless steel then with fused silica, were developed to improve resolution of GC separation. With a capillary column, less vapor is intro-... 

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