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Ecotoxicological information

Ecotoxicological Summary

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Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.003 mg/L
Assessment factor:
50
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
0.014 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor

STP

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

Sediment (freshwater)

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

Sediment (marine water)

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

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Additional information

The registered substance tri(isopropyl)silyl acrylate (TIPSA) will hydrolyse extremely rapidly (see section 5.1.2 of IUCLID) to yield tris(1-methylethyl)silanol (TIPSOH) and acrylic acid (propenoic acid; CAS No. 79-10-7). Exposure in the semi-static and static short-term aquatic toxicity tests will therefore be predominantly to these hydrolysis products.

Tris(1-methylethyl)silanol has a predicted water solubility of 60 mg/l at 20°C and acrylic acid is reported to be miscible in water 25°C (see section 4.8 of IUCLID).

The silanol hydrolysis product (tris(1-methylethyl)silanol) has a predicted log Kow of 3.9 at 20°C.

Acrylic acid has a log Kow value of 0.46 at 25°C (see section 4.7 of IUCLID).

In view of the very rapid hydrolysis of tri(isopropyl)silyl acrylate the PNEC values are calculated for the hydrolysis products tris(1-methylethyl)silanol and acrylic acid. The PNECs for tris(1-methylethyl)silanol are based on the study data summarised in this chapter.

Acrylic acid (propenoic acid; CAS No. 79-10-7) has been the subject of a REACH dissemination report and the PNEC values derived in this report are used in this assessment.

Conclusion on classification