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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/Chesar 3.5), see table below. Due to the moderate hydrolysis of the registered substance, the distribution calculation is done for both the parent substance and the hydrolysis products, (3-thiocyanatopropyl)silanetriol and ethanol (CAS 64-17-5; EC No. 200-578-6).

Table: Distribution modelling for STP

 

Triethoxy(3-thiocyanatopropyl)silane

(3-Thiocyanatopropyl)silanetriol

Ethanol

 

 Fraction of emission directed to water by STP

99.35

99.97

12.62

[%]

Fraction of emission directed to air by STP

0.018

2.66E-10

0.07

[%]

Fraction of emission directed to sludge by STP

0.623

0.021

0.069

[%]

Fraction of the emission degraded in STP

0

0

87.23

[%]

 

Triethoxy(3-thiocyanatopropyl)silane (CAS 34708-08-2; EC No. 252-161 -3) is not expected to undergo any significant biodegradation and is predicted to have 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.

(3-Thiocyanatopropyl)silanetriol is predicted to have very low Henry's Law constant, low log Kow/log Koc. Therefore, water is the main compartment to which it is expected to partition in a sewage treatment plant.