Abstract
The effective adsorption of folic acid at mercury electrodes is demonsrated. The adsorptive stripping response is evaluated with respect to experimental parameters such as the preconcentration time and potential, bulk concentration, stirring rate and others. The accumulation curves at different concentrations of folic acid show slopes proportional to the bulk concentration. At a certain stage (40% of the equilibrium surface coverage), the change of the morphology of the adsorption peak indicates that interactions between adsorbed molecules are substantial. The Effect of some surfactants present in the medium on the adsorbed folic acid stripping signal is studied. In the presence of a 700-fold excess of gelatin, the folic acid signal is 40% of its initial value (gelatin-free solution). The ac voltammetric mode applied to the stripping of adsorbed folic acid reveals the most sensitive response, allowing 1×10 −11 M folic acid to be detected by using 10 min of accumulation time.
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