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REDUCING THE DETECTION LIMITS OF SPECTROMETER WITH NITROGEN MICROWAVE PLASMA «GRAND-SVCH»

The article presents the results of a study of the effect of the power supplied to the microwave plasma and the nebulizer gas flow rate on the detection limits of the spectrometer with nitrogen microwave plasma «Grand-SVCH». It is shown that a change of the spectral lines intensity of the elements being determined with varying parameters of the spectra excitation source is related to their excitation energy. The maximum intensities of the lines are achieved at a power of 1700 W and a nebulizer gas flow of 0,4 l/min and 0,6 l/min for lines with excitation energies of 4-15 eV and 3,5-4 eV, respectively. Using the obtained values of the parameters of the excitation source of the spectra allows reducing the detection limits of elements by 1,5-4 times.