title: Enhanced electrochemiluminescence employed for the selective detection of methyl parathion based on a zirconia nanoparticle film modified electrode.
abstract: A simple, rapid and sensitive electrochemiluminescence (ECL) sensor was proposed for direct measurements of methyl parathion (MP) based on the strong affinity of a nano zirconia particles (ZrO(2) NPs) modified film on the electrode to the phosphoric group.  ZrO(2) NPs, which could provide a larger absorption area to immobilize organophosphorus, was firstly modified on the glassy carbon electrode surface to prepare the proposed ECL sensor (ZrO(2)/GC).  Subsequently, the ZrO(2)/GC electrode was scanned from -0.8 to +0.6 V to obtain the background signal at 0.44 V in a luminol/KCl solution.  Then, a certain concentration of MP was added to an aqueous solution for 240 s, which was absorbed onto the ZrO(2)/GC electrode surface.  Moreover, the MP absorbed on the surface of the ZrO(2)/GC electrode enhanced the ECL signal of luminol in the luminol/KCl solution, which increased with the concentration of MP.  As a result, a novel ECL sensor was obtained in a luminol/KCl solution.  The MP was determined in the range of from 3.8 × 10(-11) to 3.8 × 10(-6) mol L(-1), with a low detection limit of 1.27 × 10(-11) mol L(-1) (S/N = 3).  The proposed ECL sensor performance for MP detection will open a new field in the application of rapid and screen detection of ultra-trace amounts of organ phosphorus pesticides (OPs) of vegetables used in farm markets.
authors.affiliation: The State Key Laboratory Base of Novel Functional Materials and Preparation Science, Faculty of Material Science and Chemical Engineering of Ningbo University, China.
authors.forename: Hankun
authors.initials: H
authors.lastname: Zhou
authors.forename: Ning
authors.initials: N
authors.lastname: Gan
authors.forename: Jianguo
authors.initials: J
authors.lastname: Hou
authors.forename: Tianhua
authors.initials: T
authors.lastname: Li
authors.forename: Yuting
authors.initials: Y
authors.lastname: Cao
mesh_terms: D000042:Absorption; D002244:Carbon / Q000737:chemistry; D004563:Electrochemistry / Q000295:instrumentation / Q000379:methods*; D004566:Electrodes; D004785:Environmental Pollutants / Q000032:analysis / Q000737:chemistry; D005504:Food Analysis; D005898:Glass / Q000737:chemistry; D008163:Luminescent Measurements / Q000379:methods*; D008743:Methyl Parathion / Q000032:analysis* / Q000737:chemistry*; D053758:Nanoparticles / Q000737:chemistry*; D013997:Time Factors; D015040:Zirconium / Q000737:chemistry*
chemical_list: D004785:Environmental Pollutants; D008743:Methyl Parathion; D002244:Carbon; D015040:Zirconium; C028541:zirconium oxide