o-Dianisidine : a new reagent for selective spectrophotometric, flow injection determination of chlorine

A flow injection analysis (FIA) procedure for the determination of free chlorine in industrial formulations and water samples is proposed. The manifold is provided with a gas-diffusion unit which permits the removal of interfering species and also the preconcentration of chlorine. The determination...

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Bibliographic Details
Published in:Analyst (London) 2001-11, Vol.126 (11), p.2087-2092
Main Authors: CATALA ICARDO, M, GARCIA MATEO, J. V, MARTINEZ CALATAYUD, J
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chlorine - analysis
Chromogenic Compounds
Dianisidine
Exact sciences and technology
Flow Injection Analysis - instrumentation
Flow Injection Analysis - methods
Spectrometric and optical methods
Spectrophotometry
Water Pollutants, Chemical - analysis
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Summary:A flow injection analysis (FIA) procedure for the determination of free chlorine in industrial formulations and water samples is proposed. The manifold is provided with a gas-diffusion unit which permits the removal of interfering species and also the preconcentration of chlorine. The determination of chlorine is performed on the basis of the oxidation by o-dianisidine as a chromogenic reagent to a coloured product which can be monitored at 445 nm. The method (for a preconcentration step of 60 s) is linear over the range 0.04-1.00 mg l(-1) of chlorine, the limit of detection is 0.04 mg l(-1), the reproducibility of the procedure (as RSD of the slope) is 3.7% for a series of four independent calibrations, the precision (as RSD of a series of 30 continuous FIA peaks of 0.56 mg l(-1) of chlorine) is 1.4% and the sample throughput is 40 h(-1). A detailed comparative study of the analytical characteristics of a single mono-channel reverse FIA assembly and the same system but provided with a Fluoropore membrane filter of 0.5 microm pore size was performed to check the advantages of the new approach in terms of sensitivity, selectivity and limit of detection.
ISSN:0003-2654
1364-5528
DOI:10.1039/b107000m