Bismuth film electrode at a silver solid amalgam substrate as a new tool for voltammetric determination of electrochemically reducible organic compounds
Abstract
New type of bismuth film electrode prepared by electrodeposition of bismuth film on a silver solid amalgam substrate (BiF-AgSAE) was tested as a sensor for voltammetric determination of electrochemically reducible organic substances using 2-amino-6-nitrobenzothiazole (ANBT) as a model analyte. Using the optimized conditions (a 9:1 (v/v) mixture of aqueous Britton-Robinson buffer solution (pH 10.0) and methanol), the limits of quantification are 0.16 μmol LMINUS SIGN 1 for direct current voltammetry (DCV) and 0.22 μmol LMINUS SIGN 1 for differential pulse voltammetry (DPV).
The obtained calibration dependences are linear in the concentration range from 0.2 to 100 μmol LMINUS SIGN 1 and the practical applicability of the newly developed electrode for the direct determination of ANBT in tap and mineral water model samples was confirmed in the concentration range from 0.2 to 10 μmol L-1.