Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
PNEC aqua (freshwater)
PNEC value:
0.2 mg/L
Assessment factor:
500
Extrapolation method:
assessment factor
PNEC freshwater (intermittent releases):
2 mg/L

Marine water

Hazard assessment conclusion:
PNEC aqua (marine water)
PNEC value:
0.02 mg/L
Assessment factor:
5 000
Extrapolation method:
assessment factor
PNEC marine water (intermittent releases):
0.2 mg/L

STP

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

Sediment (freshwater)

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

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
0.082 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:
0.047 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential for bioaccumulation

Additional information

Conclusion on classification

Classification relevant information:

Degradation:

Hydrolysis: < 1 min at pH 4-9 and 1.5 °C (OECD 111)

Biodegradation: not readily biodegradable (1% after 28 d and 0% after 60 d, OECD 310)

 

Bioaccumulation:

Trichloro(4-methylphenyl)silane: not relevant due to fast hydrolysis

Silanol hydrolysis product (4-methylphenyl)silanetriol:

·        Log Kow = -0.6 (QSAR)

·        BCF = 0.91 – 3.16 L/Kg (QSAR, EPI Suite v4.1, BCFBAF models)

 

Aquatic acute toxicity

Fish: LC50 (96 h) > 100 mg/L (nominal, OECD 203, Oncorhynchus mykiss) based on read across from CAS 98-13-5

Aquatic invertebrates: EC50 (48 h) > 100 mg/L (nominal, OECD 202, Daphnia magna) based on read across from CAS 98-13-5

Algae/aquatic plant: ErC50 (72 h) > 100 mg/L (nominal, OECD 201, Pseudokirchneriella subcapitata) based on read across from CAS 98-13-5

 

Aquatic chronic toxicity

Fish: no data available

Aquatic invertebrates: no data available

Algae/aquatic plant: NOErC (72 h) ≥ 100 mg/L (nominal, OECD 201, Pseudokirchneriella subcapitata) based on read across from CAS 98-13-5

 

Classification according to CLP

Trichloro(4-methylphenyl)silane (CAS 701-35-9) hydrolysis vigorously to (4-methylphenyl)silanetriol and hydrochloric acid. The silanol hydrolysis product is not considered to be rapidly degradable and the calculated BCF is clearly < 500 L/kg. Acute toxicity data are available for three trophic levels (fish, aquatic invertebrates and algae) while chronic data are available for algae. No acute or chronic hazard was identified. Therefore trichloro(4-methylphenyl)silane (CAS 701-35-9) is not classified and labeled according to the consolidated version of Regulation (EC) No 1272/2008 and further amendments (ATPs).