Document Detail


o-Dianisidine: a new reagent for selective spectrophotometric, flow injection determination of chlorine.
MedLine Citation:
PMID:  11763097     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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.
Authors:
M Catalá Icardo; J V García Mateo; J Martínez Calatayud
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Analyst     Volume:  126     ISSN:  0003-2654     ISO Abbreviation:  Analyst     Publication Date:  2001 Nov 
Date Detail:
Created Date:  2001-12-12     Completed Date:  2002-01-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0372652     Medline TA:  Analyst     Country:  England    
Other Details:
Languages:  eng     Pagination:  2087-92     Citation Subset:  IM    
Affiliation:
Departamento de Química Analítica, Universidad de Valencia, Spain.
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MeSH Terms
Descriptor/Qualifier:
Chlorine / analysis*
Chromogenic Compounds
Dianisidine
Flow Injection Analysis / instrumentation,  methods
Spectrophotometry
Water Pollutants, Chemical / analysis*
Chemical
Reg. No./Substance:
0/Chromogenic Compounds; 0/Water Pollutants, Chemical; 119-90-4/Dianisidine; 7782-50-5/Chlorine

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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