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Toxicity to aquatic plants other than algae

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Description of key information

Based on a worst-case approach, the substance is assessed to be acutely toxic to aquatic plants.

Key value for chemical safety assessment

Additional information

The toxicity of Orasol Black Pink 478 (CAS 97862-65-2) to aquatic plants was investigated in a 7d growth test performed with duckweed (Lemna gibba) according to OECD TG 221 (BASF SE, 2017; Rep. no.: 63E0059/16E027). The 7d ErL50 was determined to be >3.2 mg/L (nominal); the 7d ErL10 was determined to be 0.629 (nominal) based on frond number (7d ErL10, nominal: 0.543 mg/L if based on dry weight).

Considering a worst-case scenario based on the available measured value (7d ErL50 > 3.2 mg/L, BASF SE, 2017; Rep. no.: 63E0059/16E027) the substance should be assessed as acutely toxic to aquatic plants.

However, it should be noted the Orasol Pink 478 (CAS 97862-65-2) is a poorly water soluble substance (6.23 ± 0.03 mg/L at a loading rate of 0.1 g/L; 33.0 ± 0.3 mg/L at a loading rate of 1.0 g/L). Considering the experimentally determined EC/EL50 value of >3.2 mg/L there is a probability that the ErL50 is above the water-solubility limit of the substance. However, based on a worst case approach, the substance is assessed to be acutely toxic to aquatic plants.

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