Project Title:
12.02-7770
910959
Inflight Ammonia Monitor
Umpqua Research Company
P.O. Box 791
Myrtle Creek
OR
97457-0118
James R.
Akse
503-863-7770
JSC
NAS9-18683
240
12.02-7770
910959
Abstract:
Inflight Ammonia Monitor
Conventional methods for ammonia analysis depend on wet chemical techniques or ion-selective
electrodes which are unstable. The innovation to be developed in this project is
a sequential process for determining the ammonia concentration in an aqueous stream
which may contain other contaminants. This process contains three major steps. Volatile
species such as carbon dioxide which may interfere with the later selective segregation
of ammonia are eliminated. Second, a liquid-liquid exchange across a vapor channel
in a microporous membrane will equilibrate the aqueous stream's ammonia level with
that in the analytical cell. Dependant on the ammonium species present, a solid-phase
metal-oxide base may be incorporated to shift any equilibrium towards ammonia. The
final step is a conducto-metric measurement or an electrochemical, oxidation-reduction
probe to determine the ammonia concentration in the analytical stream. This analytical
technique will offer a reliable interference free method.
Applications may include use as an industrial on-line ammonia monitor or laboratory
ammonia analyzer.
ammonia monitor, sensor, on-line, membrane, conductivity, electrochemical