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Based on a weight of evidence approach, the toxicity of lavandin oil heavy fraction to aquatic organisms was first estimated with the additivity formula, as recommended in the Regulation (EC) No 1272/2008 (CLP), using adequate toxicity data of major constituents, greater than 1% in the UVCB substance considered as a mixture. Six constituents were considered, representing 86% of the mixture.

Based on individual toxicities of these six major constituents, the EC50 value for lavandin oil heavy fraction is estimated to be 2.92 mg/L for aquatic invertebrates.

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