The sensing performance of solid-state amperometric sensors based on natural sulfide minerals, i.e., pyrite and chalcopyrite, has been characterized for the detection and measurement of hydrogen peroxide (H2O2) in aqueous medium. The sensors showed a wide linear relationship range between response current and the concentration of H2O2 from 1.0 × 10−5 mol L−1 to 1.0 × 10−2 mol L−1 and 1.0 × 10−4 mol L−1 to 3.0 × 10−2 mol L−1 for pyrite and chalcopyrite, respectively. The limit of detection (LOD) was as low as 8.6 × 10−6 mol L−1 and 5.2 × 10−5 mol L−1 (S/N = 3), respectively. The electrodes exhibited great sensitivity, repeatability and short response time (less than 5 s). The results show that pyrite and chalcopyrite can be used as a natural, low cost, reliable and sensitive sensor for hydrogen peroxide detection, creating a new and high value application for the sulfide minerals.
