Flow-injection biamperometric determination of nitrate (by photoreduction) and nitrite with the NO −2/I − reaction

An unsegmented continuous-flow method for the determination of nitrite and nitrate is proposed. Nitrate is photoreduced by UV irradiation with a low-pressure 8 w mercury lamp. The nitrite in the sample and that resulting from the photoreduction of nitrate are used to oxidize iodide ion. Tri-iodide t...

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Bibliographic Details
Published in:Analytica chimica acta 1998-06, Vol.366 (1), p.241-249
Main Authors: Gil Torró, I, Garcı́a Mateo, J.V, Calatayud, J.Martı́nez
Format: Article
Language:English
Subjects:
Analytical chemistry
Biamperometry
Chemistry
Electrochemical methods
Exact sciences and technology
Flow injection
Nitrate
Nitrite
Photoreactors
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Summary:An unsegmented continuous-flow method for the determination of nitrite and nitrate is proposed. Nitrate is photoreduced by UV irradiation with a low-pressure 8 w mercury lamp. The nitrite in the sample and that resulting from the photoreduction of nitrate are used to oxidize iodide ion. Tri-iodide thus formed is detected biamperometrically in excess iodide by using a flow-cell furnished with two platinum electrodes polarized at 100 mV. The limits of detection, throughput and reproducibility ( n=26) thus achieved for nitrite and nitrate are 25 and 50 μg l −1, 27 and 25 h −1, and 1.2 and 1.6%, respectively. The proposed method was used to determine nitrate and nitrite in natural waters, waste waters, soils, meat products and fertilizers.
ISSN:0003-2670
1873-4324
DOI:10.1016/S0003-2670(98)00109-3