Registration Dossier

Ecotoxicological information

Endpoint summary

Administrative data

Description of key information

The key ecotoxicity values to assess the aquatic toxicity of the registered substance zinc cyanide are as follow:

- Short-term toxicity to fish: 96h-LC50 = 1.038 mg/L (based on measured concentrations)

- Short-term toxicity to aquatic invertebrates: 48h-EC50 = 3.351 mg/L (based on measured concentrations)

- Toxicity to aquatic algae and cyanobacteria: 72h-ErC50 = 0.878 mg/L (based on growth rate, measured concentrations). This value represents the lowest acute E(L)C50 of the dataset.

- Toxicity to microorganisms: 30min-EC50 = 2.3 mg/L

Based on these results, the lowest acute E(L)C50 is below 1 mg/L.

Additional information

CLP Classification proposal

It is proposed to compare submission substance dataset to CLP environmental criteria laid down in CLP Regulation (including 2nd Adaptation to Technical Progress, Com Reg No 286/2011).

Acute aquatic hazard: category 1. Reasoning: lowest E(L)C50 below 1 mg/L. M-factor acute = 1 because the lowest E(L)C50 is between 0.1 and 1 mg/L

Chronic aquatic hazard: category 1. Reasoning: adequate chronic toxicity data are not available. Lowest acute E(L)C50 below 1 mg/L and the substance is regarded as not rapidly degradable.