Journal
ANALYTICA CHIMICA ACTA
Volume 577, Issue 2, Pages 220-224Publisher
ELSEVIER
DOI: 10.1016/j.aca.2006.06.057
Keywords
ion chromatography; speciation analysis; ammonium ion; nitrite; nitrate
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The paper presents a new method for a simultaneous determination of inorganic nitrogen species in the oxidized (NO2-, NO3-) and reduced (NH4+) form in rain water samples. The method is based on a system of nitrogen species separation employing ion exchange and diode-array detection. The ions are separated in a strong ion-exchanger, nitrites and nitrates are determined directly at 208 and 205 nm, respectively, while the ammonium ions are determined in the column hold-up time after a post-column derivatization by the Nessler reagent, at 425 nm. The use of a diode-array detector permits a simultaneous identification of the inorganic nitrogen species in 8 min. The detection limits obtained are: NO2-, 0.1 mg L-1; NO3-, 0.05 mg L-1; NH4+, 1 mg L-1. The method proposed has been successfully used for speciation analysis of inorganic nitrogen in precipitation. (c) 2006 Elsevier B.V. All rights reserved.
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