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EC number: 201-251-0
CAS number: 80-10-4
Table 1: Oxygen consumption rates,
percentage inhibition values and pH values in the definitive test after
3 hours contact time
Nominal conc. (mg/l)
Initial oxygen reading (mg O2/l)
Final oxygen reading (mg O2/l/)
Oxygen consumption (mg O2/l/min)
based on mg of trichloro(phenyl)silane/L
after adjustment to that of the dechlorinated tap water.
Initial test results: EC50 360 mg/l; NOEC
180 mg/l (based on mg of trichloro(phenyl)silane/L). The pH of test
solutions dropped to 6.5 at 320 mg/l, 2.3 at 560 mg/l and 1.5 at 1000
Activated sludge respiration inhibition 3hr EC50 value of >1000 mg/l
(Nominal. Equivalent to >740 mg/l phenylsilanetriol) and 3hr NOEC value
of 1000 mg/l (Nominal. Equivalent to 740 mg/l phenylsilanetriol). The
study is considered reliable.
The inhibition of the degradation activity of activated sludge is
There are no microorganism toxicity data available for
dichloro(diphenyl)silane, therefore good quality data for the
structurally-related substance, trichloro(phenyl)silane (98-13-5), have
been read across. Both substances hydrolyse to structurally-related
silanol hydrolysis products, phenylsilanetriol and diphenylsilanediol.
The other hydrolysis product is HCL. 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 but the expected
concentrations are low.
Both dichloro(diphenyl)silaneand trichloro(phenyl)silane are
within an analogue groupdiscussed in Section 1.4. Substances within this
wider analogue group, in general, exhibit no evidence of significant
toxicity to microorganisms.
This wider analogue group for the toxicity to microorganisms
endpoint consists of a number of sub-classes of substances. However,
read-across is carried out between substances with the same sub-class in
Table 7.4.2 presents microorganism toxicity data available for
substances within the sub-class (III-22) of alkoxysilanes, silanols,
acetoxysilanes and chlorosilanes, etc, where greater functional group(s)
in side chain after any very rapid hydrolysis has been accounted for.
Bothdichloro(diphenyl)silaneand trichloro(phenyl)silaneare members of
It is therefore considered valid to read-across the results for
trichloro(phenyl)silane to fill the data gap for the registered
substance. Additional information is given in a supporting report (PFA,
2013j) attached in Section 13 of the IUCLID dossier.
Table 7.4.2: Microorganism toxicity data available for substances
within the relevant sub-class of chemicals.
Result: E(I)C50 (mg/l)
Result: NOEC (or EC10/ EC20) (mg/l)
>1000 mg/l (Phenylsilanetriol >740mg/l) with pH adjustment
≥1000 mg/l (Phenylsilanetriol 740mg/l) with pH adjustment
EC20 177 mg/l
0% inhibition up to 100 mg/l test conc
An activated sludge respiration inhibition 3hr EC50value
of >1000 mg/l (Equivalent to >740 mg/l phenylsilanetriol) and 3hr NOEC
value of 1000 mg/l (Equivalent to 740 mg/l phenylsilanetriol) were
reported for trichloro(phenyl)silane based on an guideline study (OECD
guideline 209 Activated sludge respiration inhibition test). This
indicates that the substance was not toxic to waste water (activated
sludge) bacteria at a nominal concentration of 1000 mg/l (Equivalent to
740 mg/l phenylsilanetriol).
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