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Environmental fate & pathways

Hydrolysis

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Description of key information

The measured half-life of CHPTAC at pH 7.8 and 12°C was 21 days.

Key value for chemical safety assessment

Additional information

The reaction of CHPTAC with water is more complex than a simple first order hydrolysis reaction. In a standard hydrolysis test conducted according to EC Test Method C.7 the half-life at 35 °C and pH 7 was 3.75 days. Extrapolating to environmental conditions (12 °C) the corresponding half life is predicted to be 75.5 days. However, other evidence suggested that true reaction rates under neutral conditions were faster than this, therefore a study was performed under environmentally relevant conditions (Raisio, 2004). In this study the measured half-life of CHPTAC at pH 7.8 and 12°C

was 21 days.

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