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This article reviews the combined technique in which vapors eluted from gas chromatographic columns are identified by their infra-red spectra. It describes the technology of the method, including both the simpler, established methods, and also the more recent techniques in which the spectroscopy...
The R F -values of some glucuronides and their free aglykones are determined by thin layer chromatographic separation. In addition to the R F -values, the characteristic color obtained for the various components after spraying with anisic aldehyde-sulfuric acidglacial acetic acid is used for...
The sensitivity of spectrophotometry for evaluation of eluted substances from TL- and paperchromatograms is not very high. Furthermore, a blank often occurs. Polarography, especially cathode-ray polarography, increases the sensitivity by the factor 10–100 without a significant blank, produced...
Logarithmic plots of gaschromatographic retention data for different classes of compounds on different pairs of stationary phases have been constructed. A remarkable effect was found. Isomers are spread along parallel lines in a repeated pattern, forming roofing tile series. The scattering of...
A report on some of the results of the 5th meeting of the international Mass Spectrometry/Gas Chromatography (MS/GC) Discussion Group, Zürich, Jan. 13th, 1968 is given. Diacetone alcohol was the sample measured in 8 to 12 different instruments, MS only and MS/GC combination. Part of the mass...
Diacetone alcohol ist not very stable in gas chromatographic analysis. The column wall and injection port material, the type of support material and liquid phase give rise to decomposition depending on the temperature. Details of the chromatogram show whether a decomposition starts in the...
The main sources of error in chromatographic analysis are described, particular attention being drawn to variable bias. This is one of the major potential sources as it is not easily detected. A comparison is made between the charateristics of the three basic methods of calculating results,...
A new experimental device is described for the determination of the adsorption rate on a single pellet from a gas mixture containing an adsorbable component. By varying the composition and flow rate of the mixture any desired steady rate of the adsorbable component can be achieved. The flame...
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