Native vs photoinduced chemiluminescence in dimethoate determination

Autor: José Luis López-Paz, Mónica Catalá-Icardo, A. Peña-Bádena, C. Choves-Barón
Jazyk: angličtina
Rok vydání: 2012
Předmět:
Photo-induced
Chemiluminescence
Analytical parameters
Limit of detection
Chemoluminescence
Biochemistry
Chloride
Enhancing effect
Analytical Chemistry
law.invention
chemistry.chemical_compound
Photoreaction
Cetylpyridinium salt
law
Chemical analysis
Solid phase extraction
Spectroscopy
Priority journal
Low pressure mercury lamps
Flow injection
Hydrolysis
Mercury (metal)
Cerium
Native chemoluminescence
Chlorine compounds
Alkaline hydrolysis
Sodium hydroxide
Sensitivity analysis
medicine.drug
Photoreactions
Article
Flow injection analysis
Oxidation
QUIMICA ANALITICA
medicine
Environmental Chemistry
Dimethoate
Hexadecylpyridinium
Interferents
Detection limit
Solid-phase extraction
Chromatography
Intermethod comparison
Water
Natural waters
Mercury
Water analysis
Photoinduced chemoluminescence
chemistry
Pre-concentration
Concentration (parameters)
Irradiation
Flow-injection system
Controlled study
Pre-Treatment
Reference value
Process optimization
Zdroj: RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia
instname
Popis: The determination of dimethoate using either its native chemiluminescent (CL) properties or its photoinduced chemiluminescence obtained by irradiation with a 15W low-pressure mercury lamp was studied. Thereby, two flow injection systems (FIA) with and without irradiation were exhaustively optimized and their analytical characteristics studied. Better sensitivity and selectivity was found in absence of irradiation, due to the enhancing effect of hexadecylpyridinium chloride (HPC), which acted as a sensitizer. In the developed FIA-CL system, the alkaline hydrolysis of dimethoate with NaOH was performed on-line in presence of HPC. The oxidation of the product of hydrolysis with Ce(IV) in hydrochloric medium induced chemiluminescence. The method provided a limit of detection of only 0.05ngmL -1 without any pre-treatment. However, the combination with solid phase extraction allowed the removal of some potential interferents as well as the preconcentration of the pesticide. Finally, the developed method was successfully applied to natural waters with recoveries between 95 and 108%. © 2011 Elsevier B.V.
This work was supported by the Ministry of Education and Science of Spain (Project CTM2006-11991) and FEDER funds.
Databáze: OpenAIRE
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