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Diss Factsheets

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

One acute toxicity to fish (rainbow trout)  

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
17.5 mg/L

Additional information

The study was conducted with one replicate vessel with seven fish per test level exposed to nominal test concentrations of 0 (water control), 1.9, 3.8, 7.5, 15, and 30 mg/L, over a 96-hour static exposure period. The fish were observed at approximately 24, 48, 72, and 96 hours for mortality and sublethal effects. Temperatures during the exposure period were 13°C. Dissolved oxygen levels ranged from 7.4-9.0 mg/L (72-87% oxygen saturation). The pH ranged from 6.6-7.6 and the light intensity ranged from 374-817 lux.

The final reported acute toxicity values for rainbow trout (Oncorhynchus mykiss) exposed to 1,4- CHDM DGE, over a 96-hour static exposure period and based on mean measured concentrations, were as follows:

The 24-hour LC50 = 17.5 mg/L (95% confidence interval 13.4 – 22.8 mg/L);

The 48-hour LC50 = 10.1 mg/L (95% confidence interval unreliable);

The 72-hour LC50 = 10.1 mg/L (95% confidence interval unreliable);

The 96-hour LC50 = 10.1 mg/L (95% confidence interval unreliable);

96-hour NOEC = 3.38 mg/L (Based on the highest concentration exhibiting no significant mortality or sublethal effects);