Registration Dossier
Registration Dossier
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EC number: 939-524-8 | CAS number: 71949-28-5
Endpoint summary
Administrative data
Description of key information
No adverse effects were observed on aquatic invertebrates and fish, but on aquatic plants and algae (EC50 = 4.57 mg/L).
Additional information
Acute toxicity data for all three aquatic trophic levels are available.
In several highly reliable studies no adverse effect of the test item on fish (Danio rerio and Oncorhynchus mykiss) were observed up to the highest tested concentration 100 mg/L (BASF, 2021 and Procter and Gamble, 1994) .
In contrast the EC50(72h) on growth inhibition of green algae is reported with 4.57 mg/L test item (BASF, 2013). This result is used for the PNEC derivation. Obviously the impact of the test item on green algae is considerable higher than those on other aquatic organisms. Therefore, it can be expected that the toxicity on algae is based on a specific mechanism. Phthalocyanine are aromatic complexes, which are structurally related to porphyrins, such as the cytochromes of the photosynthesis. Equal to the photosynthesis pigments, the phthalocynines are colored green-blue, due to adsorption of light with a wavelength between 600 and 700 nm. Therefore phthalocyanine compete for the light energy.
No long-term studies for the toxicity of 'zinc phthalocyanine sulfonate' on fish and aquatic invertebrates are available. In Annex IX of Regulation (EC) No 1907/2006, it is laid down that chronic tests shall be proposed by the registrant if the chemical safety assessment indicates the need to investigate further the effects on fish or aquatic invertebrates. Since ‘zinc phthalocyanine sulfonate’ is with high probability acutely not harmful to fish and invertebrates long-term tests are not required. For aquatic green algae, which represents the most sensitive trophic level, an ErC10(72h) of 1.07 mg/L is reported. These findings are underlines by an experimenatl study to assess the growth inhibition potential of the test item to Lemna gibba. The EC50 (7d) was 85 mg/L and the NOEC (7d) = 8.52 mg/L, based on the dry weight and the mean measured concentration (BASF, 2021).
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