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Advisor(s)
Abstract(s)
A multi-commuted flow system coupled to a gas diffusion device was developed for the
spectrophotometric determination of ammonium nitrogen in sea and estuarine waters. The efficiency
of complexing agents to prevent precipitation of metallic hydroxides, due to the high pH value of the
carrier solution, was studied. Under the optimised conditions, no interference was observed from
different expected interfering ions as well as volatile amines. The proposed method provided the
determination of NH4
+ in concentrations ranging from 50 to 1000 mg L 1, with detection and
quantification limits of 18 and 35 mg L 1, respectively. A determination rate of 20 h 1 was achieved, with
good repeatability for 10 consecutive injections of sea and estuarine samples (relative standard
deviations lower than 2.0%). Accuracy of the methodology was assessed through recovery assays in
10 samples and also by analysis of certified reference material.
Description
Keywords
Pedagogical Context
Citation
"Journal of Environmental Monitoring". ISSN 1464-0325. 11 (2009) 228–234
Publisher
The Royal Society of Chemistry