Determination of Aminonaphthalenes and Aminobiphenyls by Liquid Chromatography with Amperometric Detection on Diamond-Film Electrode
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aDepartment of Natural Products, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, bDepartment of Chemistry, Michigan State University, Lansing, USA, cUNESCO Laboratory of Environmental Electrochemistry, Department of Analytical Chemistry, Charles University, Prague
An amperometric detector with a diamond-film working electrode was tested for the determination of 1?aminonaphthalene and 2?aminobiphenyl by liquid chromatography. The noise, background current, signal stability, linearity of calibration curve and detection limits were compared with the parameters obtained using classic glassy carbon electrode. The signal of analytes was reproducible and stable at least for 8 h for both electrode materials. Calibration curves were linear in the whole range (10-7 - 10-4 mol/L) and the sensitivity was higher for the glassy carbon electrode. Both the background current and noise were substantially lower on the diamond-film electrode. As a result, the detection limits of analytes (1.10?7 mol/L for both analytes) were 5-7 times lower for the diamond-film electrode.