Abstract.
A multi-pumping flow system for the spectrophotometric determination of nitrite and nitrate is described. The determination of nitrite is based on the Griess-Ilosvay reaction. Nitrate can be determined after its on-line reduction to nitrite using hydrazine sulphate in alkaline medium. Calibration was linear up to 3 mg NO2 − L−1 with a limit of detection (3sb/S) of 0.013 mg NO2 − L−1 an injection throughput of 55 injections h−1 and a repeatability (RSD) of 0.5% for the direct determination of nitrite. Two calibration graphs within the ranges 0.039–7 mg NO3 − L−1 and 0.026–5 mg NO2 − L−1 were run for the determination of nitrate and nitrite under reducing conditions, respectively. A limit of detection of 0.039 mg NO3 − L−1 was obtained. An injection throughput of 27 injections h−1 and an RSD lower than 1.5% were achieved. The method was successfully applied to the determination of nitrite and nitrate in water samples.
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Correspondence: Víctor Cerdà, Department of Chemistry, University of the Balearic Islands, Carretera de Valldemossa Km7.5, 07122 Palma de Mallorca, Spain
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Pons, C., Santos, J., Lima, J. et al. Multi-pumping flow system for the determination of nitrite and nitrate in water samples. Microchim Acta 161, 73–79 (2008). https://doi.org/10.1007/s00604-007-0822-z
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DOI: https://doi.org/10.1007/s00604-007-0822-z