Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
260 mg/L
Assessment factor:
1 000
PNEC freshwater (intermittent releases):
260 mg/L

Marine water

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
10 mg/L
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Sediment (marine water)

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
insufficient hazard data available (further information necessary)

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no or insufficient data available at present

Additional information

Conclusion on classification

Calcium, aluminium and hydroxide are extremely abundant in natural water, sediments and soil compartments. Calcium will be present in organisms and plants as well as possibly dissolved in the water column. Hydroxide ions, or hydrogen and oxygen should also be easily found throughout the natural environment. Because none of these breakdown products are unnatural, there addition to the environment should cause no environmental change.

The toxicity of CAHC can be described to the pH increase due to the addition of OH-, as the calcium and aluminum concentrations are too low to explain the effects. The toxicity of CAHC is depending inthe composition of the test waters, especially the buffer capacity of the water.