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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

One study was carried out on the mixture of isomers (CERI, 2000) and two other studies were conducted on the isomers 1 ,3-DIPB and 1,4-DIPB respectively (Eastman, 1984, 1986).

The study performed on the mixture used dispersant, and the estimated toxicity values were found to be higher than the water solubility determined by CERI: 96 h LC50=0.707 mg/L (95% C.L.: 0.539 -0.935 mg/L; measured concentration).

The study conducted on the meta isomer used a flow-through, recirculating elutriation system designed to expose the organisms to an exposure concentration at or near the solubility of the test substance. Results of an unpublished 96-hour volatility study on m-DIPB indicated that the substance is extremely volatile in water with 100% of the material lost over 96-hours from a 1.9 mg/L solution. Therefore, the measured concentration of m-DIPB (0.93 mg/L) was the result of the low solubility and high volatility of the test substance, but reflected the most effective experimental flow-through design to maximize the exposure concentration. The toxicity test on p-DIPB was conducted in a similar manner. Therefore, these tests were conducted using the most effective experimental designs. All fish exhibited normal behavior. The conclusion was that the meta and para isomers are not toxic to fish at solubility limit.

Key value for chemical safety assessment

Additional information

LC50 -96H > 0.91 mg/L