Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.878 µg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
8.78 µg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
87.8 ng/L
Assessment factor:
10 000
Extrapolation method:
assessment factor
PNEC marine water (intermittent releases):
0.878 µg/L

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
23 µg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
3.32 µg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.332 µg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.149 µg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Conclusion on classification

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 thelowest acute E(L)C50of 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.

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.