Abstract
A novel approach was developed for nitrate analysis in a FIA configuration with amperometric detection ( E = −0.48 V). Sensitive and reproducible current measurements were achieved by using a copper electrode activated with a controlled potential protocol. The response of the FIA amperometric method was linear over the range from 0.1 to 2.5 mmol L −1 nitrate with a detection limit of 4.2 μmol L −1 (S/N = 3). The repeatability of measurements was determined as 4.7% ( n = 9) at the best conditions (flow rate: 3.0 mL min −1, sample volume: 150 μL and nitrate concentration: 0.5 mmol L −1) with a sampling rate of 60 samples h −1. The method was employed for the determination of nitrate in mineral water and soft drink samples and the results were in agreement with those obtained by using a recommended procedure. Studies towards a selective monitoring of nitrite were also performed in samples containing nitrate by carrying out measurements at a less negative potential (−0.20 V).
Published Version
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