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Ecotoxicological information

Long-term toxicity to aquatic invertebrates

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Description of key information

The pigment has to be classified as chronically harmful to aquatic organisms based on its Ni solubility.

Key value for chemical safety assessment

Additional information

One long term study on Daphnia magna is available. In the study conducted according to OECD 211 a NOEC (21 d) >1 mg/l was determined (MOE (2001). Thus, with a high probability P.I Pigment Green 50 itself (i.e. without the impurity Ni) is not chronically harmful to aquatic organisms.

The chronic ERV for Ni was estimated to be 2.4 µg/L according to OECD 29. The dissolved Ni concentrations of

P.I Pigment Green 50 (including the impurity Ni titanate) were

4 µg Ni/L and < 1 µg Ni/L at pH 5.5 and pH 8.5 for the 28 day test, respectively and for a loading rate of 1 mg/L. Thus, the dissolved Ni concentration exceeds the chronic ERV at acidic conditions, whereas at alkaline conditions the dissolved Ni were well below the ERV.

Thus, the impurity Ni titanate has to be classified as chronically harmful to aquatic organisms.

For details regarding the concentrations of Ni after different P. I Pigment Green 50 loading rates according to the

T/D Protocol (OECD 29) please see document attached in chapter 1.4. The Ecotoxicity Reference Values (ERVs) were taken from a document of the Nickel Consortia, 2010: Environmental Read-across approach. Please see attachmend under endpint summary "Ecotoxicological information".