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Ecotoxicological information

Long-term toxicity to fish

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A study has been conducted to assess the short term toxicity of MK92K to Sheepshead Minnow. Although this is a marine species and there was no specific test media analysis, the 96h LC50 was 14.1 mg/L. Since this endpoint is higher than the invertebrate EC50 and the algal EC50, it is not considered necessary to conduct any further tests on fish species.
Based on the available aquatic data, the algal NOEC should be used to derive the PNEC for the aquatic risk assessment. In addition, MK92K consists predominantly of quaternary ammonium compounds. For compounds of this nature, sorption to soils, sediment and suspended solids (humic acid) occurs as a result of the positively charged amines. As a result toxicity to aquatic species is likely to be reduced in the presence of humic acid and suspended sediment, thereby reducing long term exposure.

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