Abstract
Square-wave voltammetry is a fast technique used for determination of trace amounts of acrylamide. When cobalt(II) ions were added to the acrylamide solution, a catalytic peak at about −1.35 V vs. Ag/AgCl was observed, which was proportional to acrylamide concentration. The calibration curve showed good linearity in the range of 200–800 ng mL−1 of acrylamide with a regression coefficient of 0.9989. The limit of detection of the method was 3.52 ng mL−1, and the relative standard deviations for concentrations of 300 ng mL−1 and 700 ng mL−1 were 99.8% × 10−2 and 79.7% × 10−2, respectively.
The authors thank Shahid Chamran University Research Council for financial support of this work.
Notes
a Conditions: 500 ng mL−1of AA; 1 µg mL−1 of Co2+; 200, 500, and 800 ng mL−1 of AA; 0.1 M KNO3; nitrogen purge time: 10 s; frequency: 50 Hz; scan increment: 45 × 10−5 V, pulse amplitude: 19.95 × 10−3 V; and large mercury drop size.
b All cations were prepared from nitrate salts and anions were prepared from sodium and potassium salts.