A process for the simultaneous absorption of NO (from nitric acid plant emissions) and H2S(from coal gas produced in synthetic ammonia plants) in aqueous Fe(II)-EDTA solution was proposed. The kinetics of absorption of NO in aqueous Fe(II)-EDTA solution was studied. It was found that the reaction was rather complicated: NO +Fe(II) - EDTA = Fe(II) (NO) EDTA

and was a second order reaction with respect to the forward reaction and first order with respect to the reverse reaction. The mechanism of the absorption process was discussed

the mathematical model describing the absorption process of(2

l)order fast reversible reaction: A + B = E

was established

and compared with other mathematical models describing the same system. Data from kinetic experiments of NO absorption in aqueous Fe(II)-EDTA solution correlated well with the mathematical model presented by the authors. The Marquardt Method was used to get optimum values for calculations. A kinetic equation of NO absorption in aqueous Fe(II)-EDTA solution was finally established.