This work described a novel type of bismuth/poly(bromocresol purple) film modified glassy carbon electrode (denoted as Bi/Poly(BCP)/GCE) for anodic stripping analysis of trace Cd 2 + . The Bi/Poly(BCP)/GCE was fabricated in situ by depositing simultaneously bismuth and cadmium by reduction at À1.20 V on the poly(BCP) film using a differential pulse voltammetry. Under the optimum conditions, the anodic stripping peak current response increased linearly with the Cd 2 + concentrations in a range of 2.0 10 À8 -1.0 10 À7 M and 1.0 10 À7 -6.0 10 À6 M in 0.1 M NaAcHAc buffer solution (pH 5.0) with the detection limit of 6.5 10 À9 M (S/N = 3). The Bi/poly(BCP)/GCE performed good reproducibility and high sensitivity. Finally, this proposed method was successfully applied to determine the concentration of Cd 2 + in water samples.
We report on an anodic stripping voltammetric method for the determination of tin using a glassy carbon electrode modified with bismuth and poly(bromophenol blue). After an accumulation time of 60 s at −1.20 V (vs. SCE), the response of the electrode to tin in 1.0 M HCl is linear in the concentration ranges from 20 nM to 1.0 μM, and from 1.0 μM to 20 μM, with a detection limit of 7.0 nM (at an SNR of 3) and with relative standard deviations in the order of 3.0-3.8%. The method was validated by comparing the results with those obtained by AAS and successfully applied to the determination of tin in canned food.
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