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EC number: 217-007-1 | CAS number: 1719-58-0
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Biodegradation in water: screening tests
Administrative data
Link to relevant study record(s)
Description of key information
Biodegradation in water, screening tests: 0% degradation in 28 days (OECD Guideline 301A), read-across from a structurally-related substance.
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 chloro(dimethyl)vinylsilane (CAS 1719-58-0), therefore good quality data for the structurally-related substance, dichloro(methyl)(vinyl)silane (CAS 124-70-9), have been read across. Both substances hydrolyse very rapidly and have structurally similar silanol hydrolysis products, dimethyl(vinyl)silanol and methyl(vinyl)silanediol, respectively. In view of the very rapid hydrolysis, it is the silanol hydrolysis product that is relevant for environmental risk assessment.
The other hydrolysis product is hydrogen chloride for both substances. Hydrogen chloride is inorganic and biodegradation is not relevant.
Chloro(dimethyl)vinylsilane (CAS 1719-58-0) and dichloro(methyl)(vinyl)silane (CAS 124-70-9) are within an analogue group of substances within which,in general, there is no evidence of any significant biodegradation once hydrolysis and subsequent biodegradation of alkoxy/acetoxy groups has been taken into account.
This analogue group for the ready biodegradability endpoint consists of a number of sub-classes of substances (based on structure/functionality) with different main codes (used to represent the different sub-classes). However, read-across is carried out between substances with the same main code in most cases.
The table below presents ready biodegradation data for substances within the sub-class (I-2) of alkoxysilanes, silanols, acetoxysilanes and chlorosilanes, etc, where the Si part is of low-biological reactivity, once any hydrolysis is accounted for. Chloro(dimethyl)vinylsilane (CAS 1719-58-0) and dichloro(methyl)(vinyl)silane (CAS 124-70-9) are members of this sub-class.
It is therefore considered valid to read-across the results for dichloro(methyl)(vinyl)silane (CAS 124-70-9) to fill the data gap for the registered substance. Additional information is given in a supporting report (PFA, 2013f) attached in Section 13 of the IUCLID 5 dossier.
Table Ready biodegradation data available for substances within the relevant sub-class (I-2) of chemicals
CAS | Name | Readily biodegradable? Yes/no | Result: Biodegradation after 28 day | Guideline | Reliability | Corrected % biodegradation once alkoxy/acetoxy biodegradation is accounted for[1] |
01066-40-6 | Hydroxytrimethylsilane | No | 0% | OECD 310 and ISO Guideline N 14593 | 1a | 0 |
013154-25-1 | Chlorotri(3-methyl-propyl)silane | No | 0% | OECD 301B | 1a | 0 |
139147-73-2 | Silane, dichlorodicyclopentyl- | No | 0.80% | OECD 301D | 2b | 1 |
000098-12-4 | Cyclohexyltrichlorosilane | No | 0% | OECD 301C | 1a | 0 |
000124-70-9 | Dichloro(methyl)(vinyl)silane | No | -6.78% (0%) | OECD 301 A | 1a | 0 |
017865-32-6 | Cyclohexyldimethoxymethylsilane | No | 15-17% | OECD 301D | 1a | -5 |
126990-35-0 | Dicyclopentyldimethoxysilane | No | 12% | OECD 301C | 1 | -5 |
None46 | t-butoxycyclopentyldimethoxysilane | No | 15% BOD; 25% TOC; 100% GC | OECD 301C | 1a | 7 |
017689-77-9 | Triacetoxyethylsilane | Yes | 74% in 21 days | EC C4-A | 1a | -1 |
017980-47-1 | Triethoxyisobutylsilane | Yes | 75% | OECD 301D | 1a | 15 |
002943-75-1 | Triethoxyoctylsilane | No | 31.50% | OECD 301D | 1a | -11 |
035435-21-3 | Triethoxy(2,4,4-trimethylpentyl)silane | No | 13% | OECD310 | 1a | -30 |
016415-13-7 | Triethoxyhexadecylsilane | No | 43% by BOD; 74% by HPLC | MITI | 1c | 16 |
001067-25-0 | Trimethoxypropylsilane | No | 54% | Annex V C4-A | 1a | 4 |
087135-01-1 | 1,6-Bis(trimethoxysilyl)hexane | yes but not meeting 10-day window | 74% | OECD 301B | 1a | 24 |
None45 | Mixture of 1,1- and 1,2-bis(trimethoxysilyl)ethane | Yes | 93% BOD; 78% TOC; 100% GC (ethanol?) | "Biodegradation study of chemical substances by microorganisms and the like"[2] | 1a | 18 |
018395-30-7 | Trimethoxy(2-methylpropyl)silane | No | 36 - 47% | OECD 301B | 1a | 4 |
002768-02-7 | Trimethoxyvinylsilane | No | 51% | OECD 301F | 1a | -9 |
142877-45-0 | Silane, trimethoxy(1,1,2-trimethylpropyl)- | No | 31% | OECD 301D | 1a | -2 |
In the study with dichloro(methyl)(vinyl)silane (CAS124-70-9), 0% (-6.78%) biodegradation was observed in 28 days. The study was conducted according to OECD 301A and is considered to be reliable. This is selected as the key study.
The study is considered to be reliability 1 (reliable without restrictions); the read across of the result is considered to be reliability 2 (reliable with restrictions).[1]The negative values in this column are where the biodegradation rate observed in the test is less than that expected assuming only alkoxy/acetoxy parts biodegrade. This could be due to low solubility of parent substance or low rates of hydrolysis. These values should in effect be considered as zero.
[2]Stipulated in "Testing Method for New Chemical Substances etc." (Kanhogyo No.5, Yakuhatsu 615, 49Kikyoku No.392, July 13, 1974 )
References:
PFA, 2013f, Peter Fisk Associates, Biodegradation Main Analogue Group report, PFA.300.005.007
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