Maßanalytische Bestimmung des Sauerstoffes in organischen Verbindungen

Direct microdetermination of oxygen in organic substances by hydrogenation

“…In other words, the blank value which must be applied in order to get satisfactory results is a more or less empirical correction factor. This conclusion agrees with the findings of Lindner and Wirth (7). The blank value which they apply to their results is also of a more or less empirical nature.…”

“…Frazer (1) also obtained low results in the analysis of sucrose; they ascribed their failure to obtain satisfactory results to an inactive catalyst. It may also be significant that the results reported for sucrose by Lindner and Wirth (7) and Unterzaucher and Bürger (13) are all low (-0.33, -0.11, and -0.26 per cent).…”

“…paper appeared by Lindner and Wirth (7) completely describing a volumetric microdetermination of oxygen in organic compounds (containing, besides carbon, hydrogen, and oxygen, also nitrogen, sulfur, and halogens), which is likewise based on the ter Meulen hydrogenation process. A preliminary notice concerning the development of a micromethod, apparently similar to the one described here, was also recently published by Unterzaucher and Burger {18).…”

METHODS OF MICROANALYSIS, VIc OXYGEN DETERMINATION; THE PLATINUM-TUBE METHOD FOR FLUORINE CONTAINING COMPOUNDS (A PRELIMINARY INVESTIGATION)

“…The exceptions are hydrogen fluoride and fluorine which react with the quartz tube and liberate oxygen during pyrolysis, giving high results. After the absorption of acidic and basic gases, the carbon monoxide passes through iodine pentoxide at 110C, 1205 + 5CO--*I 2 + 5CO 2 The iodine is absorbed in acetic acid which contains bromine and potassium Thus, the amount of iodine titrated is six times that released by the iodine pentoxide, presenting a very advantageous conversion factor. For each mole of oxygen present in the analyzed substance, 2.…”

Analytical chemistry

“…Similar methods are adopted when examining plant ash for zinc in the presence of nickel, cobalt, cadmium, lead, copper, and bismuth. 21 Adaptation of the polarograph has been described for the routine analyses of copper together23 in steel, and of aluminium, manganese, zinc, and lead within certain limits of concentration in magnesium alloys. 24 The limitations of the method when applied to the analysis of brasses have been examined,25 and the polarograph has been found satisfactory for the determination of the total alkali metals, after removal of calcium and magnesium, in mineral waters and natural plant ashes where the concentration is of the order of O -O O ~N .…”