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Short-term toxicity to fish

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Owing to the extremely low solubility of butyl methoxydibenzoylmethane in water, concentration levels toxic for fish could not be reached. Therefore, the 96-h LC50 for Carp exceeded the maximum solubility of butyl methoxydibenzoylmethane in water at a loading of 100 mg/L, the regulatory limit concentration (water solubility of butyl methoxydibenzoylmethane was determined to be ca. 0.03 mg/L).

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96-Hour Acute Toxicity Study in Carp with butyl methoxydibenzoylmethane. The study procedures described in this report were based on the EEC directive 92/69, Part C.1. “Acute toxicity for fish”; and the OECD guideline No. 203: “Fish Acute Toxicity Test”.

Butyl methoxydibenzoylmethane induced no mortality in Carp when exposed to a filtered or an unfiltered solution prepared at 100 mg/L. Due to low solubility of test item, actual concentrations could not be maintained at more than 80 % of the initial concentration. However, every possible effort was made to ensure that the maximum soluble fraction of the test item was tested and maintained. In conclusion, owing to the extremely low solubility of butyl methoxydibenzoylmethane in water, concentration levels toxic for fish could not be reached. Therefore, the 96-h LC50 for Carp exceeded the maximum solubility of butyl methoxydibenzoylmethane in water at a loading of 100 mg/L (nominal), the regulatory limit concentration. The water solubility of butyl methoxydibenzoylmethane was determined to be 0.03 mg/L.