A Lead Sensor Based on Stripping Voltammetric Analysis Using Screen-Printed Electrode Modified with Polymeric Hydrogel Membrane
An electrochemical sensor for the determination of lead has been developed. The sensor transduction method was by stripping voltammetry and the best sensor response towards lead was obtained at pH 7, 0.3 M ammonia buffer with optimum pHEMA loading of 1.5 μg. The response to Pb2+ is at parts per billion range and linear response is from 100 – 1000 μg L−1 Pb2+ (R2 = 0.9971) with a response time of 6 min at a stripping potential of -0.55 V. The addition of a poly(2-hydroxyethyl
methacrylate) (pHEMA) membrane coated onto the screen-printed electrode was able to improve the response for the determination of Pb2+ in a blood serum matrix when compared with electrode without coated pHEMA.