A Gas Diffusion Technique Coupled with Flow Injection Systems. Optimization of the Process in its Application to the Fluorimetric Determination of Ammonium in Water Samples
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Abstract
A novel flow injection-gas-diffusion (GD-FI) system has been developed for the on-line analysis of ammonium ion in waters with fluorimetric detection, using an acceptor solution containing the Eosin-Bluish (EB) acid-base indicator. This, together with optimization of the process of gas transfer through the membrane, increases the sensitivity of the method to a considerable extent. Under optimum conditions, it is possible to determine the analyte within the 0.02–1.5 mg l-1 range, with a limit of detection of 5 µg l-1 and relative standard deviations (n = 12, [NH 4 + ] = 50 µg l-1 and 0.05 µg l-1) of 3.4% and 3.0% respectively. The determination rate was 15 samples per hour.
Keywords
Gas-diffusion Flow injection analysis Ammonium determination Eosin bluish Water On-line process analysisReferences
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