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111.
Titanium - catalyzed dimerization of cycloheptatriene affords pentacyclo[7.5.0.02,8.05,14.07,11]tetradeca-3,12-diene, , and pentacyclo[8.4.0.03,7.04,14.06,11]tetradeca-8,12-diene, . By heating, is converted quantitatively into . 相似文献
112.
This paper presents qualitative and quantitative comparative results on the simultaneous TG-DTG DTA of five commercial and low-grade bauxites. The methodology of qualitative determination of the basic mineral forms contained in bauxites is currently being established. The weight losses relating to the steps in the TG curve allow determination of the contents of the basic minerals in bauxite. These are recalculated as percentages of Al2O3, SiO2, CaO moisture and total volatiles. The final results are in accordance with the results of classical chemical analyses, and this jusitifies the use of this technique as a quick method for qualitative and quantitative determinations of both commercial and low-grade bauxites.
Zusammenfassung Qualitative und quantitative Ergebnisse vergleichender simultaner TG-DTG-DTA-Untersuchungen an 5 kommerziellen und geringwertigen Bauxiten werden vorgestellt. Die Methodologie der qualitativen Bestimmung der wichtigsten im Bauxit enthaltenen Minerale wird ausgearbeitet. Die Gewichtsverluste bei den entsprechenden TG-Stufen erlauben die Berechnung der Gehalte an den wichtigsten Mineralen. Diese werden umgerechnet in die Anteile an Al2O3, SiO02, CaO, Feuchtigkeit und Glühverlust. Letztere Resultate stimmen mit denen klassisch-chemischer Analyse überein. Das erlaubt die Anwendung thermoanalytischer Methoden als Schnellverfahren für qualitative und quantitative Bestimmungen in kommerziellen und geringwertigen Bauxiten.
, . , . , , , . , , .相似文献
113.
M. Harangozó V. Frank J. Tölgyessy M. Ondráček 《Journal of Radioanalytical and Nuclear Chemistry》1994,182(1):57-62
Radionuclide X-ray fluorescence method with a Si/Li semiconductor detector and238Pn exciting source was used in the study of Mn, Fe, Cu, Zn, and Pb content of solid emissions, raw and final materials of a brick factory. From the point of view of metal content, the working environment of the brick factory is safe for workers. 相似文献
114.
Summary The effect of pre-adsorbed benzene and ethanol on the adsorptive properties of natural zeolite (clinoptilolite) has been studied
by gas-solid chromatography. It has been shown that modification of the solid surface by volatile organics has a significant
influence on the adsorptive properties. The modification is of the same order as the more difficult modification by inorganics,
as illustrated here by clinoptilolite modification with Co2+. Energy distribution of surface adsorptive sites appears to be continuous and confirms previous finding that only a small
proportion of active sites is responsible for most adsorbate retention.
Part II reference [4] 相似文献
115.
The Flow Injection technique is shown to provide fast, reliable and sensitive methods for the determination of calcium in various aqueous as well as serum samples; spectrophotometric or potentiometric detection can be used. At sampling rates of 100–110 samples per hour, with 30-μl sample injections, high reproducibility of measurement and low reagent consumption are achieved in both methods. In the spectrophotometric method, the analytical readout is available within 12 s after sample injection at a total reagent consumption of 0.75 ml per analysis. The potentiometric measurement of the calcium activity in serum is placed on a reliable basis by alternating measurements of serum samples and aqueous standards without incurring any non-reproducible changes in potential between aqueous and serum solutions. This permits the simultaneous determination of pH and pCa, the analytical readout being available within XXX s of sample injection. The good agreement between the results obtained with the Flow Injection method and those attained by atomic absorption and EDTA titrations as well as pCa stat-measurements show that the new methods are potentially suitable for routine analysis. 相似文献
116.
The hybridization in several cyclic polyacetylene compounds has been calculated by the maximum overlap method, assuming planar and non-planar geometries of the molecules. In the planar configuration the hybrids describing the molecular skeleton deviate from the corresponding bond directions. We have a few “bent” bonds, but in contrast to the situation in small rings, here the deviation angles are negative, i.e., the hybrids point toward the inside of the ring. Non-planar structures in which acetylene groups are kept in a plane and CCH2 or CH2 groups are displaced out of the plane show less deviation from the bond directions of bent bonds. Furthermore, the deviation angles decrease with an increase in the out-of-plane displacement of methylene groups. Finally, when the angle of bending of the molecules approaches 50°, the deviation vanishes, predicting a puckered conformation for the molecules. Correlation between CC stretching vibration frequencies and the corresponding CC bond overlap is discussed. 相似文献
117.
Zusammenfassung Es wurde eine chromatographische Methode zur Auftrennung und Identifizierung der Polyäthylenglykole und ihrer Monoäther nach Über-führung in die Ester der 3,5-Dinitrobenzoesäure ausgearbeitet. Es wurden entweder Lösungsmittelsysteme mit Dimethylformamid oder Formamid als stationäre und Hexan, Cyklohexan, Benzol, Chloroform und ihre Gemische als mobile Phase oder mit Paraffinöl imprägnierte Papiere und das Gemisch Dimethylformamid—Methylalkohol—Wasser als mobile Phase angewendet.
Herrn Dipl.-Ing.J. Kami aus unserem Institut danken wir für die Darstellung und Reinigung einiger angewandter Verbindungen. 相似文献
Summary A Chromatographic method has been developed for the separation and identification of the polyethylene glycols and their mono-ethers after conversion into the esters of 3,5-dinitrobenzoic acid. The solvent systems employed consisted of dimethylformamide or formamide as stationary phase and hexane, cyclohexane, benzene, chloroform and their mixtures as mobile phase, or papers impregnated with paraffin oil and the mixture of dimethyl-formamide-methyl alcohol were used as the mobile phase.
Résumé On a élaboré une méthode chromatographique de séparation et d'identification des polyéthylèneglycols et de leurs monoéthers après leur transformation en ester de l'acide dinitro-3,5 benzoïque. On a employé soit les systèmes de solvants avec le diméthylformamide ou le formamide comme phase stationnaire, et l'hexane, le cyclohexane, le benzène, le chloroforme et leurs mélanges comme phase mobile, ou des papiers imprégnés d'huile de paraffine et le mélange diméthylformamide-alcool méthylique-eau comme phase mobile.
Herrn Dipl.-Ing.J. Kami aus unserem Institut danken wir für die Darstellung und Reinigung einiger angewandter Verbindungen. 相似文献
118.
An electrochemical method for the determination of the ionophores monensin and lasalocid was developed, based on the polarization of an agar gel/nitrobenzene electrolyte interface. The measured current corresponding to the facilitated ion transfer across this interface is directly proportional to the concentration of an ionophore dissolved in the organic phase. Using cyclic voltammetry in a three-electrode system the detection limit for both ionophores is about 3 × 10?5 M. 相似文献
119.
Zusammenfassung Die Reaktion von 1-Nitroso-2-naphthol mit 1-und 2-Naphthol sowie die Reaktion von 2-Nitroso-1-naphthol mit 2-Naphthol in Äthanol und in Äther bei Anwesenheit von HNO3 gibt 5H-Dibenzo[a,j]phenoxazon-(5) (I), 5H-Dibenzo[a,j]phenoxazon-(5)-14-oxid (II), 5H-Dibenzo[a,h]phenoxazon-(5) (III) sowie 5H-Dibenzo[a,h]phenoxazon-(5)-14-oxid (IV). Es wurde ein Reaktionsmechanismus vorgeschlagen und die Konstitution der hergestellten Verbindungen spektrophotometrisch und potentiometrisch bestimmt.
Mit 4 Abbildungen 相似文献
The reaction of 1-nitroso-2-naphthol with 2-and 2-naphthol and the reaction of 2-nitroso-1-naphthol with 2-naphthol in ethanol or ether in the presence of nitric acid have been studied. The main reaction products isolated were the dibenzophenoxazones I–IV. The reaction mechanism for their formation is proposed.
Mit 4 Abbildungen 相似文献
120.
P. Baláž K. Tkáčová E. G. Avvakumov 《Journal of Thermal Analysis and Calorimetry》1989,35(5):1325-1330
Experimental results on the influence of preliminary mechanical activation on the thermal decomposition of chalcopyrite are presented and discussed. The following experimental facts were found:
The intensive grinding of chalcopyrite leads to a shift in temperature of the endothermic DTA peak and brings about a decrease in the activation energy of the thermal decomposition of CuFeS2. These results can be attributed to the mechanically produced alterations in structure and surface properties of the mineral. 相似文献
1. | a decrease in the temperature of the endothermic DTA peak of-CuFeS2 from 821 K for a non-activated sample to 763 K for an optimally activated one; |
2. | a decrease in the apparent activation energy of the thermal decomposition of CuFeS2 from 238 kJ mol–1 for a non-activated sample to 72 kJ mol–1 for an optimally activated sample. |