In situ deposition of bismuth on pre-anodized screen-printed electrode for sensitive determination of Cd2+ in water and rice with a portable device

作者：Yongfang Li, Zijun Wang, Xuan Chen, Zhijian Yi, Rui Wang · 发表于：Scientific Reports · 年份：2024 · DOI：10.1038/s41598-024-69626-7 · 被引用次数：5 · 研究领域：Electrochemical Analysis and Applications、Analytical Chemistry and Sensors、Advanced Chemical Sensor Technologies

Electrochemical detection is favorable for the rapid and sensitive determination of heavy metal cadmium. However, the detection sensitivity needs to be further improved, and a portable, low-cost device is needed for on-site detection. Herein, an in-situ bismuth modified pre-anodized screen-printed carbon electrode (SPCE) was developed for Cd 2+ determination by square wave anodic stripping voltammetry (SWASV). The in-situ bismuth modification enhances the enrichment of Cd 2+ , and together with pre-anodization improve the electron transfer rate of electrode, thus enhancing the detection sensitivity. The electrode modification method combines pre-anodization and in-situ bismuth deposition, which is very easy and effective. Furthermore, a self-made PSoC Stat potentiostat coupled with a stirring device was fabricated for portable and low-cost electrochemical detection. After comprehensive optimization, the developed method can reach a testing time of 3 min, a detection limit of 3.55 μg/L, a linear range of 5–100 μg/L, and a recovery rate of 91.7–107.1% in water and rice samples for Cd 2+ determination. Therefore, our method holds great promise for the rapid, sensitive and on-site determination of Cd 2+ in food samples.