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Description of key information

Thiourea is not susceptible to hydrolysis at environmentally relevant pH. 

Key value for chemical safety assessment

Additional information

Two data sources are available that describe the hydrolysis of thiourea at different pH. Both data sources are of low reliability. However, as no other reliable standard data are available, and as both sources report the same result, the data are used in an weight-of-evidence approach:

Schmidt-Bleek et al. (1982) report that thiourea is stable to hydrolysis at pH 4, 7, and 9.

Details on test method, analytical methods, and test duration are not available (secondary literature).

Korte & Greim (1981) determined the hydrolysis of thiourea at pH 1.2, 3, 7, and 9 according to OECD Guideline A-79.74D at the concentration of maximum water solubility. The concentration of the parent substance in the test vessels was measured by means of UV spectroscopy. Under the conditions of the test no hydrolysis was observed.