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Article info. : 2005; 2(4) (pp 244~337)
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A Chemiluminescence Flow Injection System for Nitrite Ion
Determination
M.K. Amini*, M. Pourhossein and M. Talebi
Chemistry Department, University of Isfahan, Isfahan
81746-73441, Iran
(Received 10 January 2005, Accepted 2 October 2005)
A chemiluminescence system is described for the determination
of nitrite ion based on new designs for an ozone generator, liquid-gas separator
and chemiluminescence reaction cell. The method is based on the gas-phase
chemiluminescence reaction between ozone and nitric oxide, which is generated
from the reduction of nitrite with iodide in sulfuric acid solution. The
efficiency of the system was evaluated by investigation of the analytical
performance characteristics of the system for nitrite determination in batch and
flow injection procedures. Under optimal conditions, the chemiluminescence
response of the system was linear against the nitrite concentration over the
range 1 to 1 ´ 104 ng ml-1 in
the batch procedure and 10 to 5 ´ 103 ng
ml-1 in the flow injection procedure, with detection limits of 1 and
10 ng ml-1, respectively. The method is highly selective and allows
for the determination of nitrite in the presence of high concentrations of
several cationic, anionic and nitrogen containing species. It has been
successfully applied to the analysis of nitrite in natural water and soil
extracts.
Keywords: Chemiluminescence, Liquid-gas separator,
Nitrite, Nitric oxide, Water analysis, Ozone generator
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