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The applicability of alumina as a stationary phase in liquid chromatography is considered. Despite the presence of hydroxyl groups on wetted alumina, chemical modification with silanes by analogy to silica is not successful. Although depolarisation can be achieved with hexamethyldisilazane, the...
The complete separation of the major cinchona alkaloids and their dihydro derivatives is achieved in less than 30 minutes, using a Hypersil 5μm octadecylsilyl column in the reversed-phase mode. Excellent peak symmetry is obtained by incorporation of a long chain amine additive in the acidic...
Gas and high-performance liquid chromatographic methods in the analysis of phenols are reviewed. Among the great number of phenolic compounds analyzed, alkylphenols, chlorophenols, dihydroxy- and trihydroxybenzenes and biphenols are chiefly considered. The advantages and drawbacks of the methods...
On the occasion of the 25-year anniversary of its invention, this article summarizes the events which led to the development of the flame ionization detector.
The dependence of column efficiency on the eluent (MeOH/H 2 O) composition in a reversed-phase liquid chromatography system within a wide concentration range has been systematically examined. It is shown that when the intracolumn effect of mass transfer and diffusion is the main factor...
The performance of a new IR monitoring system was investigated with a fused-silica packed capillary column. The concept of the system is to select solvents which do not have IR absorption at the wavelength where the detector will be operated (e.g., perdeutero-or perhalogeno-compounds) and to use...
Iron(III), cobalt and nickel are extracted from acidic aqueous solutions with a mixture of Aliquat 336 and Thorin I in chloroform (containing an excess of alkylammonium chloride). The retention of metals on silanised silica treated with a mixture of Aliquat 336 and Thorin I decreases in the...
An HPLC gradient elution procedure which allows the separation of the great majority of phenolic acids (derived from benzoic and cinnamic acids) in wine is proposed. The method has been applied to the separation and identification of the phenolic acids of “Fino” sherry wine, as well as to...
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