Toxic effects of chlorinated organic compounds and potassium dichromate on growth rate and photosynthesis of marine phytoplankton

Kresten Ole Kusk, Niels Nyholm

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Abstract

The toxic effects of potassium dichromate (K2Cr2O7), 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 EC50) 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 K2Cr2O7 varied much more. The effects of DCA and DCP on the growth rate of some species were also investigated. EC50 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.
Original languageEnglish
JournalChemosphere
Volume25
Issue number6
Pages (from-to)875-886
ISSN0045-6535
Publication statusPublished - 1992

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