Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

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

Marine water

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

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
168.18 mg/L
Assessment factor:
1
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
7.92 mg/kg sediment dw
Assessment factor:
100
Extrapolation method:
assessment factor

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.792 mg/kg sediment dw
Assessment factor:
1 000
Extrapolation method:
assessment factor

Hazard for air

Hazard for terrestrial organisms

Soil

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

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

No aquatic toxicity data are available for trimethyl borate due to its rapid hydrolysis in water to form methanol and boric acid. Methanol is much less toxic to aquatic organisms compared to boric acid. Thus, PNEC values derived for boric acid are protective of the environment for the stoichiometric contribution of methanol. Therefore, toxicity data compiled for Boric Acid were used. The endpoints included in the dossier under environmental hazard assessment were reported from studies on the ecotoxicity of boron and various compounds, such as boric acid (H3BO3), anhydrous sodium tetraborate (Na2B4O7), and hydrated sodium tetraborates (Na2B4O7. xH2O). Aquatic taxa included fish (freshwater and marine), amphibians, crustacea, insects, annelids, algae, protozoa, bacteria, cyanobacteria and higher plants (duckweed).

Conclusion on classification

No environmental classification is required for trimethyl borate as the lowest toxicity values were between 1 and 10 mg/L and there was little to no potential for bioaccumulation.