Orbitrap mass spectrometry data for Kachemak Bay Streams, Alaska, Dissolved Organic Matter analysis, 2023-2024

Samples collected in May (Sp), July (Su), and September (Fall). Data collected at UAA's ASET laboratory in 2023-2024. Samples were collected in solvent and acid washed 500mL HDPE amber bottles and frozen prior to analysis. Once thawed, samples were filtered through combusted Whatmann glass fiber filters (0.45 microns), analyzed for dissolved organic carbon content, and extract using Bond Elut PPL (100mg, 3mL) with a target concentration of 1000 micrograms C per mL. Extracts were run on the ASET lab's Orbitrap in negative mode. Raw data files were imported into Composer where 10E8 exclusion lists removed contaminate peaks.