DETERMINATION OF ELEMENTS IN VISCOUS ORGANIC LIQUIDS BY ARC ATOMIC EMISSION SPECTROMETRY

Abstract

It is shown that direct analysis of viscous organic liquids (medical and industrial adhesives, polymeric flocculant) by arc atomic emission spectrometry using aqueous standard solutions for constructing calibration dependences is impossible due to the matrix effect. This limitation is eliminated when the samples are diluted by at least in an order of magnitude, which leads to an increase in the limits of detection. A simplified scheme of acid mineralization of samples directly on the electrode (50 μL of nitric acid per 10 μL of sample) is proposed. The absence of the influence of the matrix is confirmed by the calculation of plasma parameters and comparison with the results obtained after traditional acid decomposition. The proposed method allows in a short time to obtain information on the content of a set of elements (Ag, Al, B, Ba, Be, Bi, Ca, Cd, Co, Cr, Cu, Fe, Mg, Mn, Ni, P, Pb, Ti, V, Zn) from hundredths of mg/kg in viscous organic liquids.