Summary: MASS TRANSFER OF NH, INTO WATER AT
University of North Carolina, Environmental Sciences and Engineering, Chapel Hill, NC 27514, U.S.A.
VINEY P. ANEJA*
Environmental Sciences, Northrop Services Inc., Research Triangle Park, NC 27709, U.S.A.
(Received 21 March 1983: accepted 25 October 1983)
Abstract-The mass transfer of NH, into water at environmental concentrations has been studied in a
two-phase flow reactor. The concentration of NH, in water ranged from 10m6 to 10m4mole l.-' and the
temperature was chjanged from 12 to 30°C. At the conditions of this experiment, the overall mass transfer
coefficient (K) is more dependent on the hydrodynamics of the gas phase than of the liquid phase. No
significant concentration or temperature effects on the value of K have been observed. The mass transport
of NH, is interpreted in terms of the individual gas phase and liquid phase mass transfer coefficients.
It has been pointed out in past studies on the oxidation
mechanism of atmospheric sulfur dioxide in aqueous
particles, mists, fogs, and rain (Junge et al., 1958; van
den Heuvel et of., 1963; Scott et al., 1967; McKay,
1969; Easter et al., 1974 Hegg er al., 1978) that arnmo-