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) SO^2-₄; (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 SO^2-₄ refer to concentrations at the beginning and end of the experiment. Each value represents the mean of three replications ± one standard deviation

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