title: A novel amperometric sensor and chromatographic detector for determination of parathion.
abstract: A novel amperometric sensor and chromatographic detector for determination of parathion has been fabricated from a multi-wall carbon nano-tube (MWCNT)/Nafion film-modified glassy-carbon electrode (GCE). The electrochemical response to parathion at the MWCNT/Nafion film electrode was investigated by cyclic voltammetry and linear sweep voltammetry. The redox current of parathion at the MWCNT/Nafion film electrode was significantly higher than that at the bare GCE, the MWCNT-modified GCE, and the Nafion-modified GCE. The results indicated that the MWCNT/Nafion film had an efficient electrocatalytic effect on the electrochemical response to parathion. The peak current was proportional to the concentration of parathion in the range 5.0x10(-9)-2.0x10(-5) mol L(-1). The detection limit was 1.0x10(-9) mol L(-1) (after 120 s accumulation). In high-performance liquid chromatography with electrochemical detection (HPLC-ED) a stable and sensitive current response was obtained for parathion at the MWCNT/Nafion film electrode. The linear range for parathion was over four orders of magnitude and the detection limit was 6.0x10(-9) mol L(-1). Application of the method for determination of parathion in rice was satisfactory.
authors.affiliation: Department of Chemistry, Wuhan University, Wuhan, 430072, P.R. China.
authors.forename: Chunya
authors.initials: C
authors.lastname: Li
authors.forename: Changfa
authors.initials: C
authors.lastname: Wang
authors.forename: Yong
authors.initials: Y
authors.lastname: Ma
authors.forename: Wei
authors.initials: W
authors.lastname: Bao
authors.forename: Shengshui
authors.initials: S
authors.lastname: Hu
mesh_terms: D015374:Biosensing Techniques / Q000295:instrumentation*; D002244:Carbon / Q000737:chemistry; D002851:Chromatography, High Pressure Liquid / Q000379:methods*; D004563:Electrochemistry; D004566:Electrodes; D005465:Fluorocarbon Polymers / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D036103:Nanotechnology; D010278:Parathion / Q000032:analysis*
chemical_list: D005465:Fluorocarbon Polymers; C040402:perfluorosulfonic acid; D010278:Parathion; D002244:Carbon