Journal
TALANTA
Volume 84, Issue 1, Pages 98-103Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.talanta.2010.12.028
Keywords
Nitrate; Reagent injection; Zinc reduction column; Spectrophotometry; On-line analysis; Green chemistry
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Funding
- Australian Research Council [LP0669359]
- EPA Victoria
- Australian Research Council [LP0669359] Funding Source: Australian Research Council
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A sensitive reagent-injection Row analysis method for the spectrophotometric determination of nitrate in marine, estuarine and fresh water samples is described. The method is based on the reduction of nitrate in a micro column containing zinc granules at pH 6.5. The nitrite formed is reacted with sulfanilamide and N-(1-naphthyl)ethylene diamine (Griess reagent), and the resulting azo compound is quantified spectrophotometrically at 520 nm. Water samples in the range of 3-700 mu g L-1 NO3--N can be processed with a throughput of up to 40 samples per hour, a detection limit of 1.3 mu g L-1 and reproducibility of 1.2% RSD (50 mu g L-1 NO3--N, n = 10). The proposed method was successfully applied for the determination of nitrate in estuarine waters and the reliability was assessed by the analyses of certified reference materials and recovery experiments. The method is suitable for waters with a wide range of salinities, and was successfully used for more than 3200 underway nitrate measurements aboard SV Pelican1 in the Two Bays cruise in January 2010. (C) 2010 Elsevier B.V. All rights reserved.
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