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Environmental fate & pathways

Hydrolysis

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Description of key information

Hydrolysis of SIKA Hardener LTJ was very fast and most rapid in acidic environment (acetous water) compared to basic environment (bidest. water). Due to the fast hydrolysis of the test substance of < 2 sec the half-life was determined to be < 1 min.

Key value for chemical safety assessment

Half-life for hydrolysis:
1 min

Additional information

The purpose of the analysis was to perform a hydrolysis test to evaluate the abiotic degradation of SIKA Hardener LTJ in water and if hydrolysis is acid catalysed. The substance was identified by flow injection via syring pump 12 µL/min with a FIMS-MS. The substance was tested in a short term test and in a long-term test. In the short-term test the samples were dissolved in water free methanol with 1mM NH4HCOO (100 µg/mL) and were contacted with water or 1% acetic acid in water. In the long term test samples were dissolved in water free acetonitile (100µg/mL) and were contacted with water or 1% acetic acid in water. The following results were received:

a) in acetous water (1% acetic acid): < 2 sec

b) in bidest. water: >> 2 sec

c) in acetous water as a function of time: ca. 5 min

d) in bidest. water as a function of time: ca. 20 h

Hydrolysis of SIKA Hardener LTJ was very fast and most rapid in acidic environment (acetous water) compared to basic environment (bidest. water). Due to the fast hydrolysis of the test substance of < 2 sec the half-life was determined to be < 1 min.