Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.001 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.001 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

STP

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

Sediment (freshwater)

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

Sediment (marine water)

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

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
0.095 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Additional information

The "added risk" approach is considered appropriate when deriving PNECs for arsenic because arsenic is a naturally occurring substance which organisms will have been exposed to over an evolutionary timescale. This takes account of background concentrations and the PNEC applies only to the "added" contribution over and above the background level.

Conclusion on classification

The lowest acute toxicity data of arsenic acid towards aquatic organisms are the following:

 

Species

Test duration/ conditions

Endpoint

Result (mg/L)

Reference

Fish

Fathead minnow (Pimephales promelas)

96h

LC50

25.6

Eisler R (1988)

Daphnia

Daphnia pulex

96h

LC50

3.4

Theegala, C. S. (2007)

Algae and other aquatic plants

Scenedesmus obliguus

96h

EC50

0.159

Chen, F (1994) cited in Lepper P., 2007

Microorganisms

Pseudomonas putida

16h

EC10

6.75

Bringmann, G (1976)

 

Arsenic acid is not readily biodegradable and has a potential to bioaccumulation.

Classification according to GHS criteria:

Therefore it is classified as Chronic category 1.

The corresponding M-Factor is 1, as the lowest observed LC50 is between 0.1 and 1 mg/L.

Classification accrording to Directive 67/548/EEC (DSD) criteria:

N: dangerous for the environment

R50/53: Very toxic to aquatic organisms. May cause long-term adverse effects in the aquatic environment.