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Toxicity to aquatic plants other than algae

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Aquatic plants have direct contact to aquatic sediments, where acetic acid is a major reaction product of anaerobic decomposition of organic matter (e.g. acidogenic bacteria). Thus, aquatic plants need to be well adapted to natural acetate concentrations in sediments. In a supporting study, Spencer and Ksander, 1995 investigated the number, length and dry weight of new shoots of freshwater plant Hydrilla verticillate exposed to sediments saturated with acetic acid for 24 hours and grown in the green house for further 21 days afterwards. The lowest IC50 (dry weight) amounted to 650 mg acetic acid/L (pH not reported) and is above the acute OECD test limit. Hence, the potential of acetic acid for toxicity to aquatic plants appears to be low.

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