Hydrogeochemical and isotopic insights into source and human health risk of nitrate in groundwater from China's largest freshwater lake basin - Chunyi Wei; Shengpin Yu; Ximin Bai; Haiyan Liu; Zhen Wang; Olivier Pourret; Qin Ge; Hui Gui; Zhongkui Zhou; Zhanxue Sun (Groundwater for Sustainable Development, 2026)