FIELD: analysis of impurities in aqueous solutions by means of secondary-ion mass spectrometry while solving various analytical including ecological problems. SUBSTANCE: examined solution is prepared for secondary ion mass spectrometric analysis by filtration and transfer of filtered solution from liquid to solid phase. Bombardment of surface of formed solid phase with ions is conducted, spectra of secondary ion emission are recorded and concentrations of elements by recorded spectra are determined. Transfer from liquid to solid phase is carried out by gradual evaporation without splashing and with exclusion of losses of solid fractions, sampling of some drops of concentrate and their placement one on another on substrate from monoisotopic refractory metal and drying. Method is becoming more effective if concentrate is filtered after evaporation. EFFECT: enhanced efficiency and authenticity of method. 3 cl, 1 tbl
