S1 Supporting information Oxidation of a dimethoxyhydroquinone by ferrihydrite and goethite nanoparticles: iron reduction versus surface catalysis Lelde Krumina, 1,2 Gry Lyngsie, 1 Anders Tunlid, 2 Per Persson 1,2 * 1 Centre of Environmental and Climate Research, Lund University, SE-223 62, Lund, Sweden 2 Department of Biology, Lund University, SE-223 62, Lund, Sweden *Corresponding author E-mail: per.persson@biol.lu.se Phone: +46 46-222 17 96 Contents S1. Experimental S1.1. Chemicals S1.2. Batch experiments S1.3. IR spectroscopy S2. Results S2.1. Quantitative chemical analysis S2.2. IR spectroscopy S2.3. Thermodynamic calculations The supporting information contains 15 figures and 3 tables.