Voltammetric behavior of various anions at a chitin-containing carbon paste electrode.

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The stripping voltammetric behavior of various anions at a chitin-containing carbon paste electrode was studied and compared with that at a chitin-free carbon paste electrode. In the pH range of solutions at which the acetylamide group of chitin was protonated, the chitin worked as an anion exchanger. Such anions as chromate, nitrite, permanganate, hexacyanoferrate(III) and vanadate were effectively accumulated onto the chitin-containing electrode, giving highly sensitive reduction or oxidation peaks. The analytical applicability of the chitin-containing electrode was investigated for chromate, nitrite and permanganate ions. The linear range of the calibration curve and the detection limit were 5×10-8-1×10-5 M and 3×10-8 M for both chromate and nitrite ions, and 1×10-7-1×10-5 M and 6×10-8 M for permanganate ions. The relative standard deviations were between 4 and 5% in all cases for 8×10-7 M. The influence of diverse anions was rather significant in some cases.
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