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V. L. Kuznecov Ju. M. Jakovlev T. S. Kazakevič E. G. Lenskaja A. V. Lebedev 《Colloid and polymer science》1976,254(8):751-752
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A. Rapp A. Markowetz M. Spraul und E. Humpfer 《Fresenius' Journal of Analytical Chemistry》1988,330(4-5):462-463
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The compensation of non specific background absorption is the main problem connected with determinations of traces of metals in the presence of large amounts of concomitants which volatilize together with the metal to be determined. This analytical problem manifests itself especially in flameless atomic absorption spectrometry used in coordination chemistry and trace analysis and can be very effectively mastered by the use of the Zeeman-effect atomic absorption spectrometry. This method works very well in the presence of 0.1 m KNO3 or NAClO4, where the most commonly used method, the deuterium background compensation, fails at this concentration of supporting electrolytes in most cases. The high compensating power of the Zeeman-effect method is also demonstrated by the determination of mercury in urine after a simple matrix modification by addition of HNO3, Br2 and KBr. The mechanism of the stabilization of mercury by this matrix modification is also discussed. The deuterium system failed in these determinations. 相似文献
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E. A. Neaev und V. P. Romanov 《Colloid and polymer science》1977,255(10):1029
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Gerhard M. Neumann 《Journal of fluorine chemistry》1973,3(2):209-225
The gas-phase composition of the systems C/F2/Y2 and W/C/F2/Y2(Y = Cl, Br) has been calculated using a digital computer on the basis that thermodynamic equilibrium is attained at the gas/solid interface with tungsten and that the rate of reaction is not kinetically controlled.The partial pressures of the various components, i.e. CX, CX2, CX3, CX4, C2X2, C2X4, C2X6 and WX, WX2, WX4, WX5, WX6, together with those of W, X2 and X (where X = F, Cl, Br) have been evaluated as a function of the temperature and of the halogen concentration in the input gas. While compounds of the type CnXm are quite stable in C/F2/Y2 systems, they are relatively unstable in the presence of solid tungsten where the corresponding tungsten compounds are formed.From the temperature dependence of the mass balance of tungsten, the direction of the chemical transport reactions in these systems may be predicted. In W/C/F2/Y2 systems, two points of inversion exist as in the tungsten-fluorine system. At low temperatures, transport proceeds down the temperature gradient, reversing its direction at moderate temperatures and proceding down the temperature gradient once more at high temperatures. 相似文献
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Hildegard Pluskal 《Fresenius' Journal of Analytical Chemistry》1957,157(5):395
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W.W. Schoeller 《Tetrahedron》1973,29(6):929-931
The nature of the CC-σ-bond in cycloalkanes (3–6) is evaluated using Ruedenberg's energy partitioning method within the MINDO/2 framework. 相似文献