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Impact of Dissolved Organic Matter on Copper Mobility in Aquifer Material

^a Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
^b Agronomy Department, Iowa State University, Ames, IA 50011-1010

View larger version (23K): [in a new window]   Fig. 1. (a) Point of zero charge determination for untreated aquifer material. (b) Linearized Langmuir plot of the Cu sorption isotherm for the untreated and oxide-free aquifer material.

View larger version (20K): [in a new window]   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.

View larger version (25K): [in a new window]   Fig. 3. Breakthrough curves of Cu when passed through untreated aquifer material and aquifer material that was treated with Na citrate–bicarbonate–dithionite to remove sesquioxides. Arrows indicate when the influent was switched to KClO4.

View larger version (21K): [in a new window]   Fig. 4. (a) Early breakthrough curves of Cu passed though untreated aquifer material in the presence of low and high molecular weight fractions of dissolved organic matter (DOM). (b) Breakthrough curves of Cu in the presence of hydrophilic acid compounds of two molecular-weight (MW) fractions. (c) Breakthrough curves of Cu in the presence of hydrophobic DOM compounds of two MW fractions. The Cu breakthrough curve in the absence of DOM is repeated in each graph for purposes of comparison. Arrows indicate when the influent was switched to KClO4.

View larger version (27K): [in a new window]   Fig. 5. Breakthrough curves of Cu passed through sesquioxide-free aquifer material (AM) in the presence of selected dissolved organic matter (DOM) fractions. The Cu breakthrough curve in the absence of DOM is also presented for purposes of comparison.