Fig. 2. (a) Breakthrough curves for 500 to 3500 Da (LMW) and >14000 Da (HMW) dissolved organic matter (DOM) fractions that had not been further separated according to hydrophobicity. The vertical axis represents effluent dissolved organic carbon (DOC) concentration relative to the influent concentration, C/C₀, and the horizontal axis represents pore volumes of solution passed through each column. (b) Breakthrough curves of DOC derived from DOM of three hydrophobicity fractions of DOM with molecular weight of 500 to 3500 Da. (c) Breakthrough curves of DOC derived from DOM of three hydrophobicity fractions of DOM with molecular weight of >14000 Da. Arrows indicate when the influent was switched to KClO₄.