Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

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

Sediment (freshwater)

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

Sediment (marine water)

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

Hazard for air

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
PNEC soil
PNEC value:
3.2 mg/kg soil dw
Assessment factor:
10
Extrapolation method:
assessment factor

Hazard for predators

Additional information

Since the background concentration in the ecotoxicological test media is negligible, the PNEC total and the PNEC added are considered to be equal.

The chemical safety assessment of strontium chromate is based on elemental strontium and chromate concentrations and read across to strontium and chromate substances, becoming reading across from Cr(III) and Cr(VI). Justification for read across from Cr(III) and Cr(VI) is attached in this endpoint summary section. Cr(VI) PNECs are also reported in the justification for read across (EU RAR, 2005).

Conclusion on classification

The current environmental classification of SrCrO4 is taken from CLP, Annex VI

(Regulation (EC) No 1272/2008 of the European Parliament and of the Council on classification, labeling and packaging of substances and mixture, amending and repealing Directives 67/548/EEC and 1999/45/EC, and amending Regulation (EC) No 1907/2006.

The current classification is based upon hexavalent chromium, Cr(VI), speciation. However, it is meaningful to highlight that SrCrO4 environmental classification should be based on the relevant Cr form that is environmental bioavailable, i.e. trivalent chromium, Cr(III). As shown in the fate and hazard assessment, Cr(VI) is in fact proven to reduce to Cr(III), once released in the environment.