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High Sensitive On-Site Cadmium Sensor Based on AuNPs Amalgam Modified Screen-Printed Carbon Electrodes

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6 Author(s)
Lei Zhang ; Sch. of Chem. & Mol. Eng., East China Univ. of Sci. & Technol., Shanghai, China ; Da-Wei Li ; Wei Song ; Lei Shi
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A portable analysis system has been successfully developed for on-site heavy metal ion detection in the environment. The disposable Au nanoparticles (AuNPs) amalgam modified screen-printed carbon electrodes (SPCE) are used in this system for the monitoring of Cd2+ in real water samples. The response current is linear to Cd2+ concentration within the range of 8.4 ppb to 500 ppm, with a low detection limit of 2.6 ppb. Meanwhile, the surfaces of SPCE could be regenerated by potentiostatic anodic stripping voltammetry. The relative standard deviation (RSD) of voltammetric measurements is 8.3% for five successive measurements on the same electrode. These AuNPs amalgam film modified SPCE provide an integrated electrochemical sensor with high sensitivity and selectivity for the determination of Cd2+. This analysis system can be broadly applied in on-site environmental monitoring due to its low cost, usability, and feasibility of mass production, especially for heavy metal ion rapid monitoring during the sudden environmental pollution accidents in China.

Published in:

Sensors Journal, IEEE  (Volume:10 ,  Issue: 10 )