Abstract
The toxic effects of potassium dichromate (K 2Cr 2O 7), 3,4-dichloroaniline (DCA) and 2,4-dichlorophenol (DCP) on the photosynthesis of natural marine phytoplankton and five species of marine microalgae were investigated. Effect concentrations corresponding to a 50 % depression of photosynthesis (6h EC 50) were found within relatively narrow ranges of 3.3–7.2 mg/l and 1.5–12 mg/l for DCA and DCP respectively, whereas the sensitivities towards K 2Cr 2O 7 varied much more. The effects of DCA and DCP on the growth rate of some species were also investigated. EC 50 values for DCP and DCA were found within the ranges 0.5–20 mg/l and 1.1–2.6 mg/l respectively. Diatoms were generally found to be the most sensitive species.
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