Laser direct infrared (LDIR) spectroscopy reveals microplastic sorting and risk evolution in a subtropical river–estuary–coastal continuum: Insights on risk assessment - Xiaoting Zhang; Yiming Lei; Tseyu Chu; Linke Zheng; Manlin Su; Yue Ke; Zhanyi Shen; Hualong Hong; Jingchun Liu; Haoliang Lu (Journal of Hazardous Materials, 2026)