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These compounds are separated on stationary phases of intermediate polarity. Class IV compounds with low polarity, but which have active hydrogen: aromatic hydrocarbons, alkenes, chloroform, methylene chloride, dichloroethane, trichloroethane 37 Stationary Phases - etc. These compounds are separated on stationary phases of intermediate polarity or non-polar. Class V non-polar compounds: alkanes, cycloalkanes. These compounds separate in non-polar stationary phases. This classification is empirical and is only meant to facilitate choosing the most suitable stationary phase for chromatographic analysis.

Chromosorb 102 Styrene-DVB 250 Separation of volatile organics and permanent gases; no peak tailing for water and alcohols 275 Separation of basic compounds, such as amines and ammonia; useful for separation of amides, hydrazines, alcohols, aldehydes and ketones 250 Nitriles, nitroparaffins, hydrogen sulphide, ammonia, sulphur dioxide, carbon dioxide, chloride, vinyl chloride, trace water content in solvents 250 Separation of aqueous solutions of formaldehyde, separation of acetylene from lower hydrocarbons and various classes of organics with boiling points up to 200º C Chromosorb Cross-linked PS 103 Chromosorb 104 ACN-DVB Chromosorb 105 Crosslinked polyaromatic Key: DVB—divinylbenzene; EGDMA—ethylene glycol dimethacrylate; PEI—polyethyleneimine; ACN—acrylonitrile; EVB—ethylvinylbenzene.

Illustrative examples of some adsorbents and temperature values at which they are active Table 3 briefly presents some gas chromatography main adsorbents’ characteristics (Grob & Barry, 2004). Adsorbent Polymeric material Tmax, °C Applications HayeSep A DVB-EGDMA 165 Permanent gases, including: hydrogen, nitrogen, oxygen, argon, CO, and NO at ambient temperature; can separate C2 hydrocarbons, hydrogen sulphide and water at elevated temperatures HayeSep B DVB-PEI 190 C1 and C2 amines; trace amounts of ammonia and water 35 Stationary Phases Adsorbent Polymeric material Tmax, °C Applications HayeSep C ACN-DVB 250 Analysis of polar gases (HCN, ammonia, hydrogen sulphide) and water HayeSep D High purity DVB 290 Separation of CO and carbon dioxide from room air at ambient temperature; elutes acetylene before other C2 hydrocarbons; analyses of water and hydrogen sulphide Porapak N DVB-EVB- 190 Separation of ammonia, carbon EGDMA dioxide, water, and separation of 165 acetylene from other C2 hydrocarbons Porapak P Styrene-DVB 250 Separation of a wide variety of alcohols, glycols, and carbonyl analytes Porapak Q EVB-DVB copolymer 250 Most widely used; separation of hydrocarbons, organic analytes in water and oxides of nitrogen Porapak R Vinyl pyrollidone (PM) 250 Separation of normal and branched alcohols Porapak T EGDMA (PM) 190 Highest-polarity Porapak; offers greatest water retention; determination of formaldehyde in water Chromosorb 101 Styrene-DVB 275 Separation of fatty acids, alcohols, glycols, esters, ketones, aldehydes, ethers and hydrocarbons.

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