Porous polymer adsorbents

Lab method using porous polymer adsorbent tubes, thermal desorption and gas chromatography 31... 

Laboratory method using porous polymer adsorbent tubes, thermal desorption and gas chromatt raphy MDHS 32 Dioctyl phthalates in air Laboratory method using Tenax adsorbent tubes, solvent desorption and gas chromatography MDHS 33 Adsorbent tu standards Preparation by the syringe loading technique MDHS 34 Arsine in air Colorimetric field method using silver diethyl-dithiocarbamate in the presence of excess silver nitrate... 

Fig. 1-6. Chromatogram of hydrocarbons on ALOT column with porous polymer adsorbent [21].

Porous polymer adsorbents are fairly popular as chromatographic adsorbents. In 1966 Hollis [41-43] suggested their use in gas chromatography. 

A review by Kiselev and co-workers [44] generally concerns sorption of gases (e.g., COg, NOg, SO2) by organic ionites. Since the adsorption of chemically active gases depends on the content of functional group accessible to the adsorbate molecules, synthesis of porous polymer adsorbents with a higher surface concentration of these groups presents one of the most important problems. 

Now porous polymer adsorbents are widely used in routine analytical practice [45]. They have the following advantages as adsorbents 1) high capacity, 2) homogeneous surface (and consequently symmetrical chromatographic zones), 3) hydropho-bicity. 

Carbon dioxide can be analyzed very well by using porous polymer types of adsorbents. These materials have also been introduced coated in capillary columns. The porous polymer adsorbent has retention characteristics which are totally different from the Molsieve. Although it is not yet clear whether the retention of a porous polymer is caused by gas-solid or by a gas-liquid chromatographic process, the practical application of porous polymers has shown that they provide a high retention and that they are applicable for a wide range of compounds. 

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