Flow injection indirect amperometric detection of ammonium ions using a clinoptilolite-modified electrode

Abstract : A copper ion-doped clinoptilolite-modified carbon paste electrode was evaluated as an amperometric sensor for non-electroactive ammonium cations in flow injection analysis. The electrochemical activity of copper was prevented in electrolyte solutions containing size-excluded cations such as tetrabutylammonium, while the presence of non-size-excluded cations such as ammonium gave rise to appreciable responses. Consequently, the injection of ammonium samples at the electrode surface (into a carrier stream made of tetrabutylammonium bromide solution) resulted in peak currents proportional to the concentration of the analyte NH4+. After optimisation of the experimental conditions, very reproducible results (standard deviations <1%, n=10) were obtained, linear calibration was achieved in the 2×10−5 M to 1×10−3 M concentration range, and the detection limit was 5×10−6 M. The effect of interfering cations was also discussed and the sensor's performance was evaluated for the analysis of ammonium in synthetic ground water.
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https://hal.univ-lorraine.fr/hal-01942043
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Submitted on : Sunday, December 2, 2018 - 9:11:57 PM
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Alain Walcarius, V Vromman, J. Bessiere. Flow injection indirect amperometric detection of ammonium ions using a clinoptilolite-modified electrode. Sensors and Actuators B: Chemical, Elsevier, 1999, 56 (1-2), pp.136-143. ⟨10.1016/S0925-4005(99)00181-1⟩. ⟨hal-01942043⟩

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