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The influence of easily and non-easily ionizable concomitants on the spectral line profiles of the atomic and ionic components of analytes with different physical properties was investigated depending on the concentration of the concomitant and observation height above the load coil. The results obtained were considered from the point of view of nebulization and plasma discharge processes. For analytical reasons, all the investigations were performed in the normal analytical zone. The apparent temperatures of excitation, ionization and local thermal equilibrium and electron number density were measured, calculated and compared under plasma conditions with and without the presence of 20 mg mi-' of Li and 50 mg ml-' of Zn. It was found that the presence of Li changed the ionization temperature and non-equilibrium parameter (b,) particularly in zones higher up in the plasma.

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The determination of lead in wines of different origin was performed by means of atomic emission spectroscopy with argon stabilized DC. U-shaped arc and electrothermal atomic absorption spectrometry. The comparison of the results obtained by the direct and standard addition method has indicated the presence of a depressive effect of the complex organic matrix. The effect is avoided successfully by mineralization, as well as by dissolution of the samples. Thus, a relative simple but precise and sensitive method involving the application of a stabilized arc and photoelectric detection with time integration of the emission signals is recommended for the determination of low concentrations of lead in wines. The complex organic matrix was investigated by recording the IR spectra of different wine fractions.