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EC number: 203-497-4
CAS number: 107-51-7
A summary of the kinetic model equations is provided in the attached
Half-life in sediment: 6.91 years
Sediment degradation rates were determined in a reliable study conducted
according to an appropriate test method.
The study was conducted under aerobic conditions with two aquatic
freshwater sediment systems (Calwich Abbey Lake sediment: 27.1% w/w sand
/ 70.4% w/w silt / 2.5% w/w clay [textural class: Silt Loam]; % organic
carbon: 4.7 % w/w and Emperor Lake sediment:63.7% w/w sand / 16.1% w/w
silt / 20.2% w/w clay [textural class: Sandy Clay Loam]; % organic
carbon: 2.0 % w/w). A half-life of 6.91 years was estimated for
transformation of L3 in the Calwich Abbey Lake sediment system. For the
Emperor Lake sediment system, a half-life of 3.50 years was determined.
The transformation products identified were pentamethyldisiloxanol
(PMDS), trimethylsilanol (TMS) and dimethylsilanediol (DMSD); the total
amount of CO2 captured was very small in both systems,
suggesting a low rate of mineralisation.
The chemical safety assessment according to REACH Annex I indicates that
it is not necessary to conduct the simulation test on ultimate
degradation in surface water, because the risk characterisation ratios
(RCRs) for the aquatic compartment, even with the assumption that the
parent substance is not biodegradable, are <1.
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