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Reliable short-term toxicity tests results are available for freshwater fish (Brachydanio rerio, new name Danio rerio), invertebrates (Daphnia magna) and algae (Scenedesmus subspicatus, new name Desmodesmus subspicatus) for the registration substance.

The relevant short-term values are:

Fish: LC50 (96 h): 345 mg/l; NOEC: 275 mg/l (expressed in terms of concentration of the hydrolysis product, 3-(trihydroxysilyl)propanethiol)

Daphnia: EC50 (48 h): 5.3 mg/l; NOEC: 2.1 mg/l (expressed in terms of concentration of the hydrolysis product, 3-(trihydroxysilyl)propanethiol)

Algae: EC50 (72 h): 732 mg/l; NOEC: 31.4 mg/l (expressed in terms of concentration of the hydrolysis product, 3-(trihydroxysilyl)propanethiol)

The rapid hydrolysis of 3-trimethoxysilylpropane-1-thiol (CAS 4420-74-0) (half-life 2.6 h at pH 7 and 20-25°C) means it is likely that the test organisms in each test were exposed primarily to the hydrolysis products, 3-(trimethoxysilyl)propane-1-thiol and methanol, and the tests have been interpreted accordingly.

An activated sludge respiration inhibition 3hr EC50 value of 463 mg/l and EC10 value of 32.6 mg/l (nominal in terms of the parent substance) were determined in a reliable study.

Long-term aquatic ecotoxicity studies are not available.