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EC number: 211-623-4 | CAS number: 675-62-7
Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
9% degradation occured within 28 days (EU Method C.4), RL2
Key value for chemical safety assessment
- Biodegradation in water:
- under test conditions no biodegradation observed
Additional information
There are no reliable ready biodegradation data available for dichloromethyl(3,3,3-trifluoropropyl)silane (675-62-7), good quality data for the analogue substance, triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane (51851-37-7) have been read across. Both substances are expected to hydrolyse within the timescale of a ready biodegradation test and both dichloromethyl(3,3,3-trifluoropropyl)silane (675-62-7) and triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane are within an wider analogue groupthan the analogue group discussed in Section 1.4. Substances within this wider analogue group, in general, exhibit no evidence of any significant biodegradation once hydrolysis and subsequent biodegradation of alkoxy/acetoxy groups has been taken into account.
The other hydrolysis products are ethanol and HCl respectively. Ethanol is readily biodegradable and is well characterised and hydrochloric acid is not expected to have adverse effects on microorganisms in a sewage treatment plant, where the pH is maintained within a favourable range and biodegradation is not relevant for hydrochloric acid as it is inorganic.
This wider analogue group for the ready biodegradability endpoint consists of a number of sub-classes of substances. However, read-across is carried out between substances with the same sub-class in most cases.
Table 4.1.4 presents ready biodegradation data within the sub-class (III-17: Highly fluorinated chains) of substances (usually chlorosilanes, alkoxysilanes or siloxanes) which contain special functionality in the hydrocarbon chain attached to Si.
It is therefore considered valid to read-across the results for triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane to fill the data gap for the registered substance .
Table4.1.4Ready biodegradation data available for substances within the relevant sub-class (III-17) of chemicals
CAS |
Name |
Readily biodegradable? Yes/No |
Result: Biodegradation after 28 days |
Guideline |
Reliability |
2374-14-3 |
2,4,6-trimethyl-2,4,6-tris(3,3,3-trifluoropropyl)cyclotrisiloxane |
No |
0% |
OECD 301B |
1 |
51851-37-7 |
triethoxy(3,3,4,4,5,5,6,6,7,7,8,8,8-tridecafluorooctyl)silane |
No |
9% |
EU Method C.4-C (Determination of the "Ready" Biodegradability - Carbon Dioxide Evolution Test) (Modified sturm test) |
1 |
Additional information is given in a supporting report (PFA, 2013f) attached in Section 13 of the IUCLID 5 dossier.
According to EU Method C.4 and GLP the substance showed with only 9% a limited biodegradation within 28 days (Diefenbach, 1997). The test methodology was considered valid as 92% of the reference substance sodium benzoate degraded within 28 days.
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