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Ecotoxicological information

Long-term toxicity to fish

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Significant direct and indirect exposure is unlikely due to the risk management measures that will be applied at industrial level and discussed in details within the exposure scenario to avoid any release of the substance directly in the municipal waste water treatment.

Based both on acute and long-term test, a PNEC of 0.13 mg/l in fresh water is calculated, while the maximum exposure calculated by EUSES based on the actual exposure scenarios and condition of use are of 0.035 mg/l and the maximum monitored quantity referred to 1997 of a monitored member of the category of the Stilbene Fluorescent Optical Brightener is 0.0011 mg/l. The local RCR in surface water is then 0.266 and 0.0052 based on estimated and monitored quantities, demonstrating that the risk for aquatic compartment is controlled.

In order to follow a precautionary approach, the substances manufactured at the highest tonnages in the category have been investigated maximising the water and sediment releases (performing the calculation using the lowest experimental Koc value). Despite the water and sediment PECs result inevitably increased, the risk resulted to be controlled using the same risk management measures (for further details, see the category justification document).

Another aspect that can be taken into account is that a test (with a good reliability) on the toxicity to fish at 14 -days with Brachydanio rerio is available (Bayer AG., 1992). The following nominal concentrations were tested: 100, 316, 1000 mg /l. A NOEC was identified at the concentration of 859 mg/l (nominal).

Taking these further results into account as well as the expected concentrations in environment, a long term toxicity test on fish is deemed unjustified.