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The effect of silanol groups on three types of octadecylmodified column gels using heat-treated silicas by calcination has been studied by high-performance liquid chromatography. After heat-treating at 180°C, 500°C and 950°C, the silicas treated with octadecyldimethylchlorosilane were used for...
It is still difficult to determine peaks and peak boundaries properly, though peak recognition is very important for the precision of quantitative data. A new computer program overcomes these problems using a method which is adapted from human judgements. The algorithm was developed for HPLC but...
The shape of the velocity profile established in a carrier liquid flowing in a duct of rectangular cross-section under conditions of isoviscous flow is well known and can be calculated by using an approximate or the exact solution of Navier-Stokes equation. The series evaluated when applying the...
The retention indices of some monosubstituted benzenes, benzaldeyhdes and acetophenones have been determined on seven OV polymethylphenylsiloxane liquid phases. The interactions and forces that affect the separation of the isomers and their elution sequences are discussed, taking into account...
A modified simplex technique has been applied to optimize the performance of an electron-capture detector under constant-current and constant-frequency pulse modes for the gas chromatographic analysis of polychlorinated biphenyls. Optimal performance was obtained by adjusting the four...
Analytical methods for the determination in environmental samples, of some selected Polycyclic Aromatic Hydrocarbons (PAH's), which are included on the EPA Priority Pollutant list, have been developed and evaluated. The methodology involves the extraction of PAH's from water samples by solvent...
Evaporative light scattering detectors can be used to detect organic substances without chromophoric groups in packed column supercritical fluid chromatography (SFC). A detector of this type has been used to detect squalane and glucose after SFC with various packed columns and binary mobile...
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