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A simple temperature programmer can be added to isothermal gas chromatographs with a 5- or 10-turn potentiometer for temperature setting by using a synchronous motor and analog or digital techniques.
This paper presents a quantitative separation scheme for 18 common inorganic ions, the separations being obtained by ion exchange chromatography. The scheme predicts, on the basis of the values of the distribution coefficients in hydrochloric acid, the order of adsorption of ions giving anionic...
This summary concerns the use of gas chromatography for the determination of activity coefficents at infinite dilution. Two special points are discussed in detail: - Elaboration of mathematical models, - Experimental problems posed in the exploitation of the chromatographic results.
R M -solvent composition relationships were investigated for pyridine, quinoline and aniline derivatives with two groups capable of adsorption on silica. Linear R M (log X S ) relationships were obtained in wide composition ranges, the slope of the lines informing about the mechanism of...
A sampling device is described for the analysis of high boiling trace components in a low-boiling solvent, as often occurs in the analysis of biochemical samples. The sample is directly introduced onto a large bore, packed pre-column featuring two independently programmed thermal zones. The...
Thin-layer chromatographic investigation was carried out on silica gel-G coated glass plates for metal dithizonates and the technique has further been applied for detecting metals present in autopsy tissues in cases of suspected suicide and homicide. R f values of metal complexes in four...
In this paper it is shown that the dansylamino acids with low mobility in partition chromatography in the solvent-mixture toluene/2-chloroethanol/pyridine/0.8 N ammonium hydroxide (7) containing n-octylalcohol (18, 21) can be separated by partition chromatography (second direction) using...
A device, called a Flame Conductivity Detector (FCD) in the following text, for measuring the electrical conductivity in flames is described, which differs from both the well-known thermionic flame ionization detectors and the flame photometric detectors. The Flame Conductivity Detector, while...
A suitable manual accessory for headspace analysis is not available commercially. Fully automated instruments (such as the Perkin-Elmer Multifract F 40) are uneconomical, if such analyses are needed only occasionally. The author has therefore tried to develop such an accessory for the Varian...
This work proposes the technical and methodical solutions advantageous in investigation of the thermal stability of poly(vinylchloride) by reaction gas chromatographic technique. The procedure involves determination of the thermal stability at temperatures below 200°C through the analysis of the...
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