Supplementary Data for Low-Molecular-Weight Dissolved Organic Matter across the Yangtze River Estuary

This dataset serves as the supplementary material for the study “Low-Molecular-Weight Dissolved Organic Matter across the Yangtze River Estuary.” It comprises six tables, including information on metabolite standards used for untargeted metabolomics analysis, summaries of bulk physicochemical parameters, and statistical summaries of the detected molecular features. These data provide supporting information for the characterization and interpretation of dissolved organic matter dynamics across the estuarine salinity gradient.