title: Ultrasensitive electrochemical sensor for p-nitrophenyl organophosphates based on ordered mesoporous carbons at low potential without deoxygenization.
abstract: p-Nitrophenyl organophosphates (OPs) including paraoxon, parathion and methyl parathion, etc, are highly poisonous OPs, for which sensitive and rapid detection method is most needed. In this work, an ultrasensitive electrochemical sensor for the determination of p-nitrophenyl OPs was developed based on ordered mesoporous carbons (OMCs) modified glassy carbon electrode (GCE) (OMCs/GCE). The electrochemical behavior and reaction mechanism of p-nitrophenyl OPs at OMCs/GCE was elaborated by taking paraoxon as an example. Experimental conditions such as buffer pH, preconcentration potential and time were optimized. By using differential pulse voltammetry, the current response of the sensor at -0.085 V was linear with concentration within 0.01-1.00 μM and 1.00-20 μM paraoxon. Similar linear ranges of 0.015-0.5 μM and 0.5-10 μM were found for parathion, and 0.01-0.5 μM and 0.5-10 μM for methyl parathion. The low limits of detection were evaluated to be 1.9nM for paraoxon, 3.4 nM for parathion and 2.1 nM for methyl parathion (S/N=3). Common interfering species had no interference to the detection of p-nitrophenyl OPs. The sensor can be applicable to real samples measurement. Therefore, a simple, sensitive, reproducible and cost-effective electrochemical sensor was proposed for the fast direct determination of trace p-nitrophenyl OPs at low potential without deoxygenization.
authors.affiliation: College of Chemistry and Chemical Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, China; Laboratory for Biosensing, Qingdao Institute of Bioenergy & Bioprocess Technology, and Key Laboratory of Bioenergy, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China.
authors.forename: Tingting
authors.initials: T
authors.lastname: Zhang
authors.affiliation: Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian 350002, China.
authors.forename: Lingxing
authors.initials: L
authors.lastname: Zeng
authors.affiliation: Laboratory for Biosensing, Qingdao Institute of Bioenergy & Bioprocess Technology, and Key Laboratory of Bioenergy, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Han
authors.affiliation: College of Chemistry and Chemical Engineering, Ocean University of China, 238 Songling Road, Qingdao 266100, China. Electronic address: litie@ouc.edu.cn.
authors.forename: Tie
authors.initials: T
authors.lastname: Li
authors.affiliation: Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian 350002, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Zheng
authors.affiliation: Institute of Advanced Energy Materials, Fuzhou University, Fuzhou, Fujian 350002, China.
authors.forename: Mingdeng
authors.initials: M
authors.lastname: Wei
authors.affiliation: Laboratory for Biosensing, Qingdao Institute of Bioenergy & Bioprocess Technology, and Key Laboratory of Bioenergy, Chinese Academy of Sciences, 189 Songling Road, Qingdao 266101, China. Electronic address: liuah@qibebt.ac.cn.
authors.forename: Aihua
authors.initials: A
authors.lastname: Liu
mesh_terms: D002244:Carbon / Q000737:chemistry*; D055664:Electrochemical Techniques; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D008743:Methyl Parathion / Q000032:analysis*; D010261:Paraoxon / Q000032:analysis*; D010278:Parathion / Q000032:analysis*; D010575:Pesticides / Q000032:analysis; D016062:Porosity
chemical_list: D010575:Pesticides; D008743:Methyl Parathion; D010278:Parathion; D002244:Carbon; D010261:Paraoxon
keywords: Electrochemical sensor; Ordered mesoporous carbons; Voltammetric detection; p-Nitrophenyl organophosphates