Title :
Electrochemical impedance spectroscopy sensing of toxic organophosphorus compounds
Author :
Narakathu, Binu Baby ; Guo, Wen ; Obare, Sherine O. ; Atashbar, Massood Z.
Author_Institution :
Dept. of Electr. & Comput. Eng., Western Michigan Univ., Kalamazoo, MI, USA
Abstract :
Detection of toxic organophosphorus (OP) compounds using electrochemical and fluorescence spectroscopy is reported. A sensor device with gold (Au) interdigitated electrodes (IDT) on a glass substrate was used for the electrochemical detection of various OP compounds. Picomolar amounts of malathion, fenthion and ethion were detected by electrical impedance spectroscopy (EIS) using benzodipyrido[3,2-a:2´3´-c] phenazine (BDPPZ) as a sensor. Quantitative detection of malathion, fenthion and ethion, were also obtained via fluorescence spectroscopy for concentrations as low as 0.1 μM, 1 μM and 10 μM, respectively.
Keywords :
chemical hazards; electrochemical electrodes; electrochemical impedance spectroscopy; fluorescence spectroscopy; spectrochemical analysis; Au; BDPPZ; benzodipyrido[3,2-a:2´3´-c] phenazine; electrical impedance spectroscopy; electrochemical detection; electrochemical impedance spectroscopy sensing; fluorescence spectroscopy; glass substrate; interdigitated electrode; toxic organophosphorus compounds;
Conference_Titel :
Sensors, 2010 IEEE
Conference_Location :
Kona, HI
Print_ISBN :
978-1-4244-8170-5
Electronic_ISBN :
1930-0395
DOI :
10.1109/ICSENS.2010.5690337
