Äquidensitometrie-eine Methode zur Beurteilung von Plasmen—XI: Untersuchung des Einflusses von NaCl und Ba(NO3)2 auf die Intensität von Linien und die Verteilung von Teilchen im Gleichstrombogenplasma der Silberstein-Methode |
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| Authors: | K Dittrich K Niebergall R Wennrich AV Karjakin LI Pavlenko IA Popova |
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| Institution: | Analytisches Zentrum der Sektion Chemie der Karl-Marx-Universität Leipzig, 7010 Leipzig, Liebigstr. 18, German Democratic Republic;Wernadski-Institut für Geochemie und Analytische Chemie der Akademie der Wissenschaften der UdSSR, Moskau, UdSSRUSSR |
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| Abstract: | The influence of NaCl and Ba(NO3)2 on the intensities of atomic lines of Al, Sn and Be and on the axial particle distribution of these elements in the d.c. arc plasma was investigated. As the analytical method we used the procedure of Silberstein in which micro-amounts of solutions were added to the cathode and also to the anode. The time of evaporation, the temperature, the electron pressure, and the intensities of lines were investigated. We used the combination of spectral photography and photographic equidensitometry to derive particle distribution. The results of these investigations were: (1) NaCl and Ba(NO3)2 reduced the temperature of the plasma. The electron pressure was constant both in the presence of fairly large amounts of NaCl or Ba(NO3)2 and in the hotter arc without additive. (2) The enhancement of the intensities was best in presence of rather large amounts of Ba(NO3)2. (3) The maximum of the particle concentration was shifted, by additives from the cathode, towards the middle of the arc. We found a correlation between intensity and this shifting. In the arc with Ba(NO3)2 the most homogeneous plasma was obtained. |
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