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Toxicity to microorganisms

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Description of key information

In a bacterial test using Pseudomonas putida (Hüls, 1994) after exposure to 4 nominal concentrations of 50, 75, 100 and 150 mg/L during 5 hours, the EC10 was 16 mg/L and the EC50 was 402 mg/L (both obtained by extrapolation). In the article of Sikkema and de Bont (1991) the order of magnitude of the onset bacteria toxicity is confirmed . They found that among 32 different organisms that can biodegrade 1,2,3,4-tetrahydronaphthalene, the test substance was toxic at concentrations of 14.6 mg/L and higher for all strains.

Key value for chemical safety assessment

EC50 for microorganisms:
402 mg/L
EC10 or NOEC for microorganisms:
16 mg/L

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