| Summary: | The aim of this work was to explore the possibility of using a Cu-exchanged zeolitic volcanic tuff (which is natural and easy to prepare and apply) for the preparation of a new low-cost carbon paste amperometric sensor for H<sub>2</sub>O<sub>2</sub> detection. The properties of the zeolitic volcanic tuff were determined using chemical analysis, energy-dispersive X-ray spectroscopy, the specific surface area, electron microscopy, X-ray diffraction spectroscopy, and Fourier-transform infrared spectroscopy. The sensor was successfully built and operates at pH 7, at an applied potential of −150 mV Ag/AgCl/KCl<sub>sat</sub>, presenting a sensitivity of 0.87 mA M<sup>−1</sup>, a detection limit of 10 µM and a linear domain up to 30 mM H<sub>2</sub>O<sub>2</sub>. These good electroanalytic parameters for H<sub>2</sub>O<sub>2</sub> detection (a low detection limit and high sensitivity) support the possibility of using these sensors for the detection of many analytes in environmental, food and medical applications.
|
|---|