Application of an Electrochemical Sensor Based on Nitrogen-Doped Biochar Loaded with Ruthenium Oxide for Heavy Metal Detection. - Li, Le; Zhao, Yonghong; Wang, Zhengjiu; Tao, Jiale; Yang, Manying; Li, Chen; Zhang, Xiaoqian; Sun, Shiguo; Zhao, Na (Biosensors (2079-6374), 2025)