FIELD: analytical chemistry. SUBSTANCE: method of analysis of microimpurities in atmospheric air includes ionization of analyzed gas, separation of formed ions in periodic, variable electric field asymmetric in polarity, selection and registration of ions. Value of intensity of electric field is chosen within range from 0.8 kV/mm up to value of intensity corresponding to break-down of analyzed gas. EFFECT: increased reliability of method. 2 cl, 3 dwg
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