E. Pungor

The role of rate of atomisation in flame photometry

Abstract It is established that if concentric atomisers are used, the surfacial pressure component of the pressure from Hagen-Poisseuilles law changes according to the grade of turbulency of the turbulent gas current. The amount of liquid passing through the capillary is influenced, therefore, by the viscosity of the solution, and more or less, as pointed out before, by the surfacial tension. If the atomiser is nonconcentric, the surfacial tension has no influence on the rate of atomisation. In the case of concentric atomisers, the results can also be explained quantitatively.

Mössbauer investigation of iron-aluminium mixed oxides

Mixed hydroxides of iron and aluminium have been precipitated from solutions containing iron and aluminium salts. The ratio of iron and aluminium was changed from 1:1 to 1:9. The mixed oxides produced by heating the hydroxides have been investigated by the Mössbauer effect. The Mössbauer spectra were composed of two systems of lines: one is due to magnetic splitting produced by alpha-Fe(2)O(3), the other is due to quadrupole splitting (0.45 mm s ) which can be assigned to iron atoms in the lattice of alpha-Al(2)O(3). The role of the anion of the solvated salts has also been investigated.

Bemerkungen zur flammenphotometrischen Bestimmung von Spurenelementen

ZusammenfassungEs wurde der Einfluß von organischen Lösungsmitteln auf die flammenphotometrische Emission untersucht und festgestellt, daß neben der spezifischen Oberfläche auch die Verdampfungswärme eine Rolle spielt.Eine Methode unter Benutzung von 3 Wellenlängen wurde zur Bestimmung von 10−4–10−5 % K bzw. Na in Na- bzw. Li-Salzen ausgearbeitet.SummaryThe effect of organic solvents on the emission in flame photometry has been investigated and has been found to depend on the specific surface of the atomized substance and also on the heat of evaporation.A new method has been worked out for the determination of 10−4 to 10−5 % K in sodium salts and K and Na in lithium salts, respectively. It is based on the evaluation of three different wave-lengths.