INVESTIGATION ON RECIPROCAL OSCILLOGRAPHI C CHRONOPOTENTIOMETRY - PREPARATION AND APPLICATION OF NEW CIRCUIT

Reciprocal oscillographic chronopotentiometry is a new method which ca n overcome some weak points of classical oscillographic chronopotentio metry such as low sesitivity and litter linear relationship. A new cir cuit with feeding back current for obtaining reciprocal oscillogram ha s been designed. The main advantages of the circuit are its higher ses itivity and better linear relationship. In the experiment, we apply a new method to determine peak potential of some organic substances. If we connect the anodic stripping circuit with the reciprocal oscillogra phic chronopotentiometric instrument, minimum detectable amount of met al ion can down to 10(-9)mol/L. Experimenal results also show there is a better linear relationship between peak height and concentration of depolarizer in solution of 10(-8)mol/L.