A microgap impedance sensor for the determination of trace water in organic solvents

被引:18
|
作者
Liang, Jie [1 ,2 ,3 ]
Chen, Bao-Qin [1 ,2 ]
Long, Yi-Tao [1 ,2 ]
机构
[1] E China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Shanghai 200237, Peoples R China
[2] E China Univ Sci & Technol, Dept Chem, Shanghai 200237, Peoples R China
[3] Shanghai Normal Univ, Dept Chem, Shanghai 200234, Peoples R China
关键词
POLYELECTROLYTE; SPECTROSCOPY; CONDUCTANCE; COMPOSITE; FILMS;
D O I
10.1039/c1an15263g
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A microgap impedance sensor with a 50 mm gap was developed for the determination of trace water in organic solvents by coating poly(dimethyldiallylammonium chloride) (PDMDAAC) and ferricyanide/ferrocyanide composite materials on indium tin oxide (ITO). The electrochemical properties of the composite materials were investigated with cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). We observed that the impedance response of the sensor depended on the concentration of trace water in the organic solvents. Under optimized conditions, the linear range for the determination of trace water was 0-0.06% for chloroform (CHCl3), 0-0.10% for acetone (CH3COCH3), 0-0.12% for tetrahydrofuran (THF), and 0-0.10% for acetonitrile (CH3CN), and the detection limits were 0.65, 1.54, 0.61, and 1.72 ppm, respectively. The results obtained from the impedance sensors were comparable to those obtained using the traditional Karl Fischer method.
引用
收藏
页码:4053 / 4058
页数:6
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