Biodiesel has a number of attractive properties, including the ability to readily solubilize a number of biocides and a tendency to reduce odors associated with other solvents such as petroleum-based diesel. Biodiesels, however, have also been implicated in reduced performance of some, but not all preservatives. It is important to assess the effects of biodiesel on each biocide. Soil block tests were performed on southern pine blocks treated with varying retentions of 4,5-dicholoro-2-n-octyl-4-isothiazolin-3-one (DCOI) with or without soy-based biodiesel. The presence of biodiesel had no consistent negative effect on the performance of DCOI.

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