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Oxytetracycline Sorption to Organic Matter by Metal-Bridging

Environmental Engineering Program, Univ. of Connecticut, 261 Glenbrook Rd., Unit 2037, Storrs, CT 06269-2037

View larger version (15K): [in a new window]   Fig. 1. Structure and chemistry of oxytetracycline (OTC). Bar shows dominant species charge as a function of pH where vertical bars represent pKa values (Tavares and McGuffin, 1994).

View larger version (12K): [in a new window]   Fig. 2. Sorption of oxytetracycline (OTC) to Chelex-100 resin with presorbed Cu, Ca, or Na cations: (a) at pH 7.6, and (b) variation with pH where numbers denote metal/OTC ratio. Note that metal/sorbate ratios were computed from the initial masses added to the tubes.

View larger version (32K): [in a new window]   Fig. 3. Schematic of oxytetracycline (OTC) concentration measurements for metal-amended humic acid at pH 5.2: (a) sample spectrum of bag contents with dissolved OTC and 80 µM dissolved Al, and (b) comparison spectra of OTC standards prepared with 80 µM total Al. The dotted line in (b) shows the OTC spectrum in the absence of Al.

View larger version (15K): [in a new window]   Fig. 4. Correlation between Kd and sorbed metal concentration for all humic acid sorbents. Solid dots are for total sorbed Al plus Fe concentrations (r2 = 0.87). Open triangles are for total sorbed Ca plus Mg plus Al and Fe concentrations (r2 = 0.39). Note that the high concentration points (105 mmol kg–1 C) are coincident for both data sets because sorbed Ca and Mg concentrations were negligible for these cases (high Al, high Fe; Table 1).