Based on the state of stationary phase, gas chromatography (GC) is classified into gas-solid chromatography (GSC), using a solid adsorbent as the stationary phase, and gas-liquid chromatography (GLC) employing a nonvolatile liquid as the stationary phase coated onto a support or the wall of column. The separation mechanism of GSC is mainly on differences between the adsorption affinities of the sample components for the surface of an active solid. GLC is designed by partition principle, and the use of it is far more prevalent than GSC.
Amerigo Scientific offers uncoated and pre-coated standard packing materials for GSC and GLC respectively, which can be used in loading columns directly. The polarity, selectivity, and separation efficiency of each packing are ensured by advanced quality control test.
Our uncoated adsorbent-type packings for GSC include silica gel (polarity and easily modified surface), activated alumina (polarity, well thermal stability and mechanical strength), activated carbon (non-polarity, large surface area and efficient recovery), and molecular sieve (strong polarity and extremely uniform pore), which are ideal stationary phases for the absorption and analysis of permanent gases and gaseous hydrocarbon mixtures.
Our pre-coated packing materials consisting of a liquid stationary phase and a superior solid support, have advantages in crush strength, heat resistance, durability, selectivity and resolution, which ensure the consistency, reliability, and repeatability of GC columns. We offer a broad range of pre-coated packing materials to satisfy different needs and analytical purposes, such as offensive odors (sulfur and nitrogen compounds, styrene monomer), environmental samples (organochlorine solvents and organic mercury), food (residual pesticides, artificial sweeteners, and preservatives), biochemicals (oils, fats, amino acids, and aromatic acids), petrochemical and chemical samples (liquefied petroleum gas, kerosene, diesel, heavy oil, and general chemicals).