1. Derivative and/or pulse voltammetries

The refinement of voltammetric techniques to improve their performance in chemical analysis takes place at two levels: firstly, improving selectivity, and secondly, lowering the detection limit.

• As far as selectivity is concerned, it is now well known that judicious manipulation of solution effects (acidity, complex formation, precipitation, etc.) enables chemical action to play on both redox potentials and diffusion effects to achieve better separation of compounds (cf. article ).

  A technical improvement can be made by deriving voltammograms in the stationary convective diffusion regime. Indeed, the derivative dI/dE = f(E) of the voltammogram I = f(E) is easily obtained since, by recording I = f(t) during a sweep of E as a linear function of t, the curve dI/dt = f(t) merges with this derivative...