Screen-Printed Electrodes for the Voltammetric Sensing of Benzotriazoles in Water

Benzotriazoles (BZTs) are high production volume industrial chemicals that are used in various applications such as corrosion inhibitors, antifreeze agents, and UV radiation stabilizers. Given their potential ecotoxicological implications for different ecosystems and in human health, as well as their poor biodegradability, they are of increasing concern. In this study, a new voltammetric method using commercial screen-printed electrodes (SPEs) has been developed for the sensing of BZTs in water samples to help in their environmental monitoring. To this end, different types of SPEs based on carbon nanoallotropes and copper were tested under several experimental conditions to determine the two BZTs most frequently detected in the environment: 1H-benzotriazole (BZT) and 5-methyl-1H-benzotriazole (Me-BZT, tolyltriazole) as model compounds for BZTs. Carbon nanofibers electrodes exhibited the best performance, allowing detection limits as low as 0.4 mg L-1 for both BZTs, with repeatability and reproducibility of ca. 5%. The applicability of the method was tested through the determination of BZT in spiked drinking water samples, suggesting its suitability for the sensing of samples heavily polluted with BZTs.
Funding: This research was partially funded by the Spanish Ministry of Science and Innovation grant number CEX2018-000794-S. Acknowledgments: The authors gratefully acknowledge the support (without funding) of the Generalitat of Catalonia, Spain, under the project 2017SGR-311, as well as the financial support of the Water Research Institute (IdRA) of the University of Barcelona for the acquisition of disposable electrodes and reagents. ).