Einflüsse dritter Partner bei der Lösungsspektralanalyse nach dem Zerstäuberverfahren—II Einflüsse organischer Lösungmittel

Abstract

A nebulizer procedure, used in spectrographic determination of aluminium and silicon in metallurgical products at levels of 0.1–10%, has been investigated to find whether adding an organic solvent to the sample solution will improve the sensitivity of the handling. Results indicate that addition of ethanol, methanol, acetone, acetic acid or formic acid leads to a smaller mean drop-size in the aerosol, by lowering the surface tension of the solution, and hence increases the throughput of the nebulizer and therefore also the intensity of the spectral line. The effect is more marked with solvents of high vapour pressure. Very high viscosity of the mixed solvent is disadvantageous, although the reduced rate of nebulization increases the ratio of the velocities of the nebulizer gas and solution, and therefore has a beneficial effect in producing smaller droplets in the primary aerosol. Suitably chosen additions of solvent result in a significant improvement in the sensitivity for the determination of aluminium and silicon.