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The distribution in a sewage treatment plant (STP) has been estimated using the SimpleTreat model (implemented in EUSES 2.1.2), see table below. Due to the moderately rapid hydrolysis of [3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane, the distribution calculation is done for the silanol hydrolysis product, [3-(2,3-epoxypropoxy)propyl]methylsilanediol.

Table: Distribution modelling for STP

Fraction of emission directed to air by STP

2.0E-06

[%]

Fraction of emission directed to water by STP

99.9

[%]

Fraction of emission directed to sludge by STP

0.057

[%]

Fraction of the emission degraded in STP

0

[%]

[3-(2,3-epoxypropoxy)propyl]diethoxy(methyl)silane hydrolyses moderately rapidly to form [3-(2,3-epoxypropoxy)propyl]methylsilanediol and ethanol.

[3 -(2,3 -epoxypropoxy)propyl]methylsilanediol is not expected to undergo any significant biodegradation, has low Henry’s Law constant and low log Kow/log Koc. Therefore water is the main compartment to which it is expected to partition in a sewage treatment plant.

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