Adsorbents inorganic

Adsorbates are arranged alphabetically starting with inorganic adsorbates within a given adsorbate data are arranged with increasing concentration of the supporting electrolyte. 

Ca >ared to inorganic adsorbents these columns are stable to aqueous injections. 

The most common inorganic adsorbents used in TLC are silica gel, alumina and kieselguhr silica gel being by far the most important. Kieselguhrs are made from natural diatomites and are an impure form of silica, being about 90% or so silica with the... 

Liquid-solid chromatography (LSC), sometimes referred to as normal phase or straight phase chromatography, is characterized by the use of an inorganic adsorbent or chemically bonded stationary phase with polar functional groups and a nonaqueous mobile phase... 

Furuya, E., Sato, K., Kataoka, T., Horiguchi, T., and Otake, Y. (2004) Amount of aromatic compounds adsorbed on inorganic adsorbents. 

Bieser, H.J. and De Rosset, A.J. (1977) Continuous countercurrent separation of saccharides with inorganic adsorbents. Staerke, 29 (11), 392-397. 

Adsorption Studies. The inorganic adsorbents listed above were... 

The adsorption of W and onto inorganic adsorbents from mobile phases containing fluoride was also studied. The... 

Table I. Values for W and Between Various Eluents and Inorganic Adsorbents with a High Affinity for Both Elements ...

Inorganic Adsorbents. These have two general classifications (a) inorganic salts (e.g., alkali metal nitrates and halides (45), alkaline earth halides (46), vanadium, manganese, and cobalt chlorides (47), and barium sulfate (48). (b) inorganic salts... 

There have been several attempts to develop alternate sampling methods, with primary attention devoted to substitution of solids or coated solids as the trapping media. Inorganic adsorbents examined include alumina (13), charcoal (40), Florisil (41), molecular sieves (42), and silica gel (9, 28, 32, 43). Surface-catalyzed degradation of some labile compounds and the... 

When direct spotting onto a TLC plate was used, the columns were packed with 0.5g inorganic adsorbent or 0.25g charcoal between glass wool plugs. The adsorbent was compacted by gentle suction, and 4 ml of eluting solvent was used. A sample size no greater than 2g should be used. 

Eqn.(3.19) describes the ideal case in which the adsorption isotherm of the solute is linear and the carrier gas does not adsorb onto the stationary phase. This simple situation is not always encountered, but analytical equations can be derived for many other cases [308]. In fact, the practical conditions in GSC are more often non-ideal than is the case in GLC. The adsorption isotherm can only be approximated as linear at very low concentrations. In other words, solute capacities are usually lower in GSC. Surface heterogeneities play a role, especially on inorganic adsorbents such as silica and alumina. These stationary phases are also sensitive to contaminations. Consequently, the observed peak shapes and retention times may be affected by the history of the column ( conditioning ) and by the water content of the carrier gas. 

A1203 activated by heating to about 200 C in a current of air or carbon dioxide, is the most, widely used absorbent. Other adsorbents used are silica gel (activated in the same manner as alumina), magnesium oxide, magnesium carbonate, calcium carbonate, calcium sulphate, barium carbonate, charocal, sucrose, talc, starch, cellulose and Fuller s earth. The inorganic adsorbents are usually heated to 200-220 C before use. 

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