Trace uranium assay using infrared photo diode electrodes

A voltammetric assay of uranium using an infrared photo diode electrode (DE) was conducted. A square wave stripping cathodic peak appeared at -0.2V (vs. Ag/AgCl/KCl) attributed to the reduction of uranium ion. Under optimum analytical conditions, various conventional working electrodes were compared. The analytical working range was found to be 0.1-1.1mg/L DE, precision range of R² = 0.9581, and the high range was obtained at 5-130 mg/L with precision R² 1/40.9981. Here, an ammonium phosphate electrolyte pH strength of 2.3, an accumulation time of 0 sec, and an accumulation potential of 0.5 V were used. Under these conditions, the relative standard deviation of 0.5mg/L was 1.69%. The detection limit was found to be 0.35 ugL^-1 (1.49 × 10^-9 M) (S/N=3). The methods developed in this study are applicable in micro-array multi-sensor systems or other analytical instrumental systems.