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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The 72 hour NOErL is 20.7 mg/l WAF and ErL50 is 75.6 mg/l WAF.

Key value for chemical safety assessment

Additional information

A single proprietary study on one stream from this category (68476 -55 -1) was available (Huntingdon Life Sciences, 2004). Pseudokirchnerella subcapitata were tested following guideline OECD 201. The algae were exposed to the test substance at five concentrations in a closed static test system with no headspace to maintain the exposure concentrations. The 72 hour ErL50 was reported as 75.6 mg/l WAF and the 72 hour NOErL as 20.7mg/l WAF. This data has been read across to all category members.

To support this study, a QSAR was used to calculate the expected toxicity of eleven representative components of the streams in the category. The calculated acute effect concentrations for invertebrates were 2.8 -9.4 mg/l. These values have been used in the PBT assessment of this category.