We wish to add our opinion to the recent discussion of the middle distillate degradation (MDD) model (Hurst and Schmidt, 2005) in this journal (Oudijk, 2007; Hurst and Schmidt, 2007). The MDD model was proposed as an extension of the Christensen and Larsen (1993) method, which, in addition to hydrocarbon-contaminated soil, includes separate phase petroleum products and a broad range of environmental settings. In our opinion, such an extension contradicts the body of information accumulated in the literature on biodegradation of petroleum hydrocarbons. The following examples reveal fundamental flaws of the MDD model.

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