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Aerobic and Anaerobic Transformations of Pentachlorophenol in Wetland Soils

^a Soil & Water Biochemistry Lab., Dep. of Agronomy, Univ. of Kentucky, N-122 Agricultural Sci. Bldg. North, Lexington, KY 40546-0091 USA
^b Univ. of Florida Wetland Biogeochemistry Lab., Soil and Water Sci. Dep., 106 Newell Hall, P.O. Box 110510, Gainesville, FL 32611-0510 USA

View larger version (29K): [in a new window]   Fig. 1 Influence of pentachlorophenol (PCP) concentration on activities of aerobic and methanogenic microorganisms in mineral TAL (A–C) and organic W8 (D–F) wetland soils: (A) and (D) CO2 production; (B) and (E) CH4 production; and (C) and (F) PCP degradation. Each value represents the mean of three replications ± one standard deviation. EC50(total) represents the total PCP concentration in the soil (dry weight basis) that inhibits microbial activity by 50%

View larger version (31K): [in a new window]   Fig. 2 Microbial transformation of pentachlorophenol (PCP) in Houghton Lake constructed marsh soil (HLPI) under four electron acceptor reducing conditions, and in aerobic and methanogenic sterile controls: (A) O2; (B) NO-3; (C) SO2-4; (D) CO2; (E) O2 + 2% HgCl2; and (F) CO2 + 2% HgCl2. Dotted lines in (E) and (F) represent autoclave + HgCl2 treatments. Initial and final NO-3 and SO2-4 refer to concentrations at the beginning and end of the experiment. Each value represents the mean of three replications ± one standard deviation

View larger version (33K): [in a new window]   Fig. 3 Microbial transformation of pentachlorophenol (PCP) in Louisiana salt marsh sediments (LSM) under four electron acceptor reducing conditions: (A) O2; (B) NO-3; (C) SO2-4; and (D) CO2. Initial and final NO-3 and SO2-4 refer to concentrations at the beginning and end of the experiment. Each value represents the mean of three replications ± one standard deviation

View larger version (15K): [in a new window]   Fig. 4 Relationship between microbial biomass C and maximum pentachlorophenol (PCP) degradation rate in seven wetland soils under methanogenic conditions. This relationship applies to soils where PCP concentration in the dissolved phase was less than the toxic level of 10 µM (see discussion)