Abstract
Abstract An in-housed designed computerised flow injection system comprised a fully integrated microdistillation flow injection (MDFI) system for low level ammonia analysis was reported. In this system, the microdistillation separation step was incorporated into the flow injection manifold and the ammonia gas sensing probe sensing element was replaced by a flow-through micro-pH electrode which sensed the change in pH of a flowing collector solution caused by the dissolution of distilled ammonia gas, in a process analogous to that occurring in the internal solution of the gas sensing probe. A computerised control and data acquisition system was constructed for this system using a commercially available data acquisition card which offered many advantages such as improved data acquisition rates and control over the system components, as well as good graphics display and data processing options. The system was optimised using a multi-variable simplex optimisation technique.
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