A novel amperometric sensor and chromatographic detector for determination of parathion

被引：34

作者：

Li, CY ^{[1
]}

Wang, CF ^{[1
]}

Ma, Y ^{[1
]}

Bao, W ^{[1
]}

Hu, SH ^{[1
]}

机构：

[1] Wuhan Univ, Dept Chem, Wuhan 430072, Peoples R China

来源：

ANALYTICAL AND BIOANALYTICAL CHEMISTRY | 2005年 / 381卷 / 05期

基金：

中国国家自然科学基金;

关键词：

carbon nano-tube; nafion; sensor; parathion; high-performance liquid chromatography;

D O I：

10.1007/s00216-004-2978-2

中图分类号：

Q5 [生物化学];

学科分类号：

071010 ; 081704 ;

摘要：

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(-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.

引用

页码：1049 / 1055

页数：7

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