DETERMINATION OF ADENINE BY CHRONOPOTENTIOMETRIC STRIPPING ANALYSIS WITH NAFION-MODIFIED ELECTRODE

The determination of adenine by chronopotentiometric stripping analysi s with Nafion-modified electrode is reported. Various conditions for t he determination of adenine were explored. In the Britton-Robinson (BR ) buffer solution (pH 3.3), preconcentration was carried out at -0.2 V (vs. SCE) for 90 seconds by chronopotentiometric stripping analysis. The peak height was proportional to the adenine concentration between 2.5 x 10(-7) and 8.0 x 10(-6) mol/L. For 10 repetitive measurements, t he relative standard deviation for 5 x 10(-6) mol/L, adenine was 2.2%. The method was fairly free of interference, and the results of real s amples were satisfactory.