Source Data and Analysis Code for Loading-Dependent Manganese Oxide Modulation of Dark Hydroxyl-Radical Probe Responses in Sediment Humic Matter from Hypoxic Lake Biwa

This record provides the processed source data, archived cyclic-voltammetry source images, portable Python analysis code, and exact data-bearing main figures supporting the manuscript “Loading-Dependent Manganese Oxide Modulation of Dark Hydroxyl-Radical Probe Responses in Sediment Humic Matter from Hypoxic Lake Biwa”. The archive includes analytical calibration summaries; matched sulfide-only controls; historical gas-driven redox-series records; complete manganese-oxide time courses; baseline-corrected 24 h primary metrics; exploratory later metrics; legacy catalase endpoints; exploratory Fe-addition time courses; archived cyclic-voltammetry plots; and code that reproduces Figures 1–6. The primary repeated manganese-oxide comparison comprises three independent experimental runs at 8.4 µg L⁻¹ MnO₂ and three at 167 µg L⁻¹ MnO₂, each paired with a within-run Lake Biwa sediment humic acid control without added MnO₂. The archived voltammetry supports qualitative mediator-accessible electron acceptance; the original numeric current–potential files were not retained. hTPA values are reported as operational apparent hTPA equivalents because formation, product loss, adsorption, filtration, fluorescence effects, and further reaction may all contribute. Mn speciation and matrix-dependent hTPA recovery were not resolved. Raw HPLC chromatograms and laboratory records are not included in this public archive and are available from the corresponding author upon reasonable request.