Hydraulic high pressure nebulization (HHPN) is the most effective and advanced sample introduction technique in atomic spectroscopy. One of the most crucial element in this technique is the Pt/Ir plate with a 10-30 μm hole and as the most important technical modification, this plate was substituted with a diamond plate having higher mechanical and chemical resistance. To make the handling and changing more easily, the diamond inlet was fixed into a threaded titanium socket. Sample introduction parameters of hydraulic high pressure nebulization were studied using this diamond inlet for several organic solvents and aqueous mixtures used as eluent in high pressure chromatography. A fast and accurate method was developed to measure the sample introduction efficiency of high pressure nebulization. The drop size distribution of the aerosol was studied by a cascade impactor using different parameters. The optimal sample introduction parameters were determined by considering the nebulization efficiency, drop size distribution data as well as the analytical signals measured by a flame atomic absorption spectrometer. The most effective impact bead turned to be a small glass sphere with the optimal distance of 15-17 mm from the outlet hole of the nebulizer. There is an optimal sample introduction rate for the most effective nebulization in case of every nozzle diameter. Organic solvents used for extraction or as chromatographic eluents in atomic spectroscopy usually have good nebulization efficiency. In case of 10 μm nozzle diameter the nebulization efficiency is 85%, 87% and 90% for acetonitrile, methanol and MIBK, respectively. This fact can be explained with the unusually small drop diameter of the organic aerosols.
|Number of pages||9|
|Journal||Magyar Kemiai Folyoirat, Kemiai Kozlemenyek|
|Publication status||Published - máj. 1 2000|
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