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Innovative approach for the electrochemical detection of non-electroactive organophosphorus pesticides using oxime as electroactive probe
- Source :
- Analytica Chimica Acta. 885:92-97
- Publication Year :
- 2015
- Publisher :
- Elsevier BV, 2015.
-
Abstract
- An innovative approach for sensitive and simple electrochemical detection of non-electroactive organophosphorus pesticides (OPs) was described in this report. The novel strategy emphasized the fabrication of an oxime-based sensor via attaching pralidoxime (PAM) on graphene quantum dots (GQDs) modified glassy carbon electrode. The introduction of GQDs significantly increased the effective electrode area, and then enlarged the immobilization quantity of PAM. Thus, the oxidation current of PAM was obviously increased. Relying on the nucleophilic substitution reaction between oxime and OPs, fenthion was detected using PAM as the electroactive probe. Under optimum conditions, the difference of oxidation current of PAM was proportional to fenthion concentration over the range from 1.0 × 10 −11 M to 5.0 × 10 −7 M with a detection limit of 6.8 × 10 −12 M (S/N = 3). Moreover, the favorable detection performance in water and soil samples heralded the promising applications in on-site OPs detection.
- Subjects :
- Inorganic chemistry
Analytical chemistry
Electrochemical detection
Biochemistry
Analytical Chemistry
law.invention
chemistry.chemical_compound
Organophosphorus Compounds
Limit of Detection
law
Oximes
Quantum Dots
Nucleophilic substitution
Soil Pollutants
Environmental Chemistry
Pesticides
Spectroscopy
Detection limit
Pralidoxime Compounds
Chemistry
Graphene
Electrochemical Techniques
Oxime
Fenthion
Electrode
Detection performance
Graphite
Organophosphorus pesticides
Water Pollutants, Chemical
Environmental Monitoring
Subjects
Details
- ISSN :
- 00032670
- Volume :
- 885
- Database :
- OpenAIRE
- Journal :
- Analytica Chimica Acta
- Accession number :
- edsair.doi.dedup.....f452c6d07ae30f0abea9c3f05e14b099