4 POTENTIAL STEP DIFFERENTIAL AMPEROMETRY IN A SINGLE-PULSE SEQUENCE MODE

A new type of four potential step differential. amperometry in a singl e pulse sequence mode is proposed on the basis of four potential step differential normal voltammetry. The charging current tends to be elim inated, and the background current is set at zero after the differenti ation and addition of the sampling currents on these four potential st eps. The signal-to-noise ratio is enhanced by utilizing a series of pu lses. In addition, since the potential returns to its initial point, i t is advantageous for electrode cleaning and the study of solid electr ode and adsorption systems. This provides an alternative approach for electrical current-type electrochemical sensors, electrochemical detec tion in liquid chromatography, and electrode kinetics studies.