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Effects of Ionic Strength, Temperature, and pH on Degradation of Selected Antibiotics

^a U.S. Geological Survey, Organic Geochemistry Research Lab., 4821 Quail Crest Place, Lawrence, KS 66049
^b Univ. of Missouri-Rolla, Dep. of Civil, Architectural, and Environmental Engineering, 1870 Miner Circle Dr., Rolla, MO 65401
^c U.S. Environmental Protection Agency-Region 7, P.O. Box 17-2141, Kansas City, KS 66117. Joint contribution of the U.S. Environmental Protection Agency (Project XP99795901-0), U.S. Geological Survey's Toxic Substances Hydrology Program, and infrastructural support from the Environmental Research Center at the Univ. of Missouri-Rolla

View larger version (24K): [in this window] [in a new window]   Fig. 1a. Properties and structures of chlortetracycline and common degradates.

View larger version (28K): [in this window] [in a new window]   Fig. 1b. Properties and structures of oxytetracycline and common degradates.

View larger version (28K): [in this window] [in a new window]   Fig. 1c. Properties and structures of tetracycline and common degradates.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Properties and structure of tylosin A.

View larger version (19K): [in this window] [in a new window]   Fig. 3. Properties and structures of other selected veterinary antibiotics studied.

View larger version (16K): [in this window] [in a new window]   Fig. 4. Comparison of rates of degradation of chlortetracycline (CTC) and oxytetracycline (OTC) normalized against the rate of degradation of tetracycline (TET) as a function of pH at 22°C.