Abstract
In this paper the diazo dye thorin was selected as a new electrochemical probe for the determination of chitosan (CTS). The electrochemical behavior of thorin with CTS was investigated on a dropping mercury working electrode in 0.2 M Britton-Robinson (B-R) buffer solution (pH 3.7). In B-R buffer thorin could be easily reduced on mercury electrode and showed a sensitive linear sweep voltammetric reductive peak at -0.57 V (vs SCE). In the presence of CTS, the reductive peak current of thorin decreased without the shift of the reductive peak potential and no new peaks appeared, which was due to the formation of a supramolecular complex of thorin with CTS. The binding constant and the binding ratio of thorin with CTS were calculated by the electrochemical data and found to be 1.07 x 10 9 and 2: 1, respectively. Under the selected conditions, the decrease in second order derivative linear sweep voltammetric reductive peak current of thorin was in proportion to the CTS concentration in the range 2.5 to 30.0 mg L- 1 and the detection limit of CTS was calculated as 1.35 mg L- 1 (3σ). The relative standard deviation (RSD) for 10 replicate determination of 20.0 mg L ―1 CTS was 0.79%. Different kinds of samples containing CTS were detected satisfactorily with this method.
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