Comparison of Potentiometric Sensors with Amperometric Sensors for Determination of Nitrate
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Date
1999-06
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Addis Ababa Universty
Abstract
A potentiometric sensor based on a membrane-stabilized interface between two immiscible
liquids has been developed. It has been tested in both stationary and flow conditions for the
determination of nitrate. The selectivity of the sensor based on the concept of ion exchange
has been studied. On the other hand, an amperometric flowthrough sensor based on nitrate
transfer across the interface of two immiscible electrolyte solutions has been developed. The
sensor was applied in a flow injection system for the determination of nitrate ion in tap
water. The results from both sensors (potentiometric and amperometric) are in the same
range (2.5 - 4.5 mg I"). The results also agreed with measurements conducted using a
UV-detector
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Keywords
Determination of Nitrate