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Environmental fate & pathways

Biodegradation in water: screening tests

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Description of key information

No biodegradation expected for Chlor(chloromethyl)dimethylsilane (CAS No. 1719 -57 -9).

Key value for chemical safety assessment

Additional information

No data is available for Chlor(chloromethyl)dimethylsilane (CAS No. 1719 -57 -9). Chlor(chloromethyl)dimethylsilane

hydrolysis results in (chloromethyl)dimethylsilandiol and hydrochloric acid which is inorganic and will not be discussed. (chloromethyl)methoxydimethylsilane (CAS No. 18143-33-4) hydrolyses to the same silanol hydrolysis product (chloromethyl)methylsilanediol. The other hydrolysis products being methanol which is readily biodegradable. It is therefore considered valid to read-across the results for (chloromethyl)methoxydimethylsilane (CAS No. 18143-33-4) to fill the data gap for the registered substance and ignoring for the conclusion the contribution of methanol to the biodegradation. In the study 9 -10% biodegradation was observed in 28 days. The study was conducted according to OECD guideline 301F and is considered reliable (IBACON, 2002). This is selected as the key study. The study is considered to be reliability 1 (reliable without restrictions). Taking into account the contribution of methanol to the biodegradation no biodegradation can be expected for

Chlor(chloromethyl)dimethylsilane (CAS No. 1719 -57 -9).

This is further supported by the following overview on the wider group of chloralkylsilanes.

CAS

Name

Readily biodegradable? Yes/no

Result: Biodegradation after 28 day

Guideline

Reliability

Corrected % biodegradation once alkoxy/acetoxy biodegradation is accounted for

002212-11-5

Silane, (chloromethyl)dimethoxymethyl-

No

30-34%

OECD 301F

1a

-16

007787-93-1

Dichloro(3-chloropropyl)methylsilane

No

0%

EC C4-C

1a

0

013501-76-3

(3-chloropropyl)diethoxymethylsilane

No

56%

EC C4-A

1a

6

002530-87-2

3-chloropropyltrimethoxysilane

No

43%

OECD 301 B

1

-7

005089-70-3

(3-chloropropyl)triethoxysilane

No

46%

EC C4-C

1a

-21

002344-80-1

Chloromethyltrimethylsilane

No

6%

OECD 301D

1a

6

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