title: Innovative approach for the electrochemical detection of non-electroactive organophosphorus pesticides using oxime as electroactive probe.
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.
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong 271018, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Dong
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong 271018, China.
authors.forename: Juying
authors.initials: J
authors.lastname: Hou
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong 271018, China.
authors.forename: Jianxia
authors.initials: J
authors.lastname: Jiang
authors.affiliation: College of Chemistry and Material Science, Shandong Agricultural University, Taian, Shandong 271018, China. Electronic address: ashy@sdau.edu.cn.
authors.forename: Shiyun
authors.initials: S
authors.lastname: Ai
mesh_terms: D055664:Electrochemical Techniques / Q000379:methods*; D004784:Environmental Monitoring / Q000379:methods; D005284:Fenthion / Q000032:analysis*; D006108:Graphite / Q000737:chemistry; D057230:Limit of Detection; D009943:Organophosphorus Compounds / Q000032:analysis*; D010091:Oximes / Q000737:chemistry*; D010575:Pesticides / Q000032:analysis*; D011220:Pralidoxime Compounds / Q000737:chemistry; D045663:Quantum Dots / Q000737:chemistry / Q000648:ultrastructure; D012989:Soil Pollutants / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009943:Organophosphorus Compounds; D010091:Oximes; D010575:Pesticides; D011220:Pralidoxime Compounds; D012989:Soil Pollutants; D014874:Water Pollutants, Chemical; D006108:Graphite; D005284:Fenthion; C028797:pralidoxime
keywords: Electroactive probe; Electrochemical detection; Organophosphorus pesticides; Pralidoxime