We maintain a curated collection of dissolved organic matter (DOM) isolates available to the research community, spanning a wide range of aquatic environments including lakes, wetlands, rivers, estuaries, and the open ocean. These samples have been purified using XAD resin solid-phase extraction, yielding representative fractions of dissolved organic matter suitable for experimental and analytical applications. These fractions include the hydrophobic organic acid (HPOA) fraction, which includes both humic and fulvic acids, transphilic organic acid (TPIA) fraction, and neutral fractions. The collection captures substantial environmental diversity in DOM source, composition, and reactivity, making it a valuable resource for studies in biogeochemistry, environmental chemistry, and aquatic sciences, and were collected primarily over the career of George Aiken.
Many samples in the collection have been extensively characterized to support advanced research applications. Available datasets include UV-vis absorption and fluorescence spectroscopy, elemental composition (CHONS), quantitative carbon and hydrogen functional group distributions determined by NMR spectroscopy, and, for select samples, detailed sulfur speciation obtained using sulfur X-ray absorption near-edge structure (XANES) spectroscopy and molecular-level characterization (via FT-ICR-MS). This combination of environmental breadth and molecular-level characterization enables researchers to select well-constrained DOM materials for studies of reactivity, metal binding, redox processes, and contaminant interactions. Interested collaborators are encouraged to inquire about sample availability and associated metadata.
