Registration Dossier

Environmental fate & pathways

Hydrolysis

Currently viewing:

Administrative data

Link to relevant study record(s)

Description of key information

Persulfates dissociate in water to the corresponding cation and persulfate anion. Hydrolysis is temperature and pH dependent. The persulfate anion, independent from the cation, undergoes decomposition in normal water or acid conditions, readily oxidizing water to oxygen, producing acid conditions. All degradation products are ubiquitous to the environment.

Key value for chemical safety assessment

Half-life for hydrolysis:
80.4 d
at the temperature of:
12 °C

Additional information

Dipotassium persulfate was tested for hydrolytic decomposition. The decomposition was performed at 50 °C and in different buffer media. Hydrolysis was temperature dependent. The rates of decomposition increased with decreasing pH ranging from 0.035 h-1 to 3.3 h-1 at 50 °C, respectively DT50 20 h (0.83 days) to DT50 210 h (8.75 days) at pH values of 1 and 10. The rate of hydrolysis at pH 7 and 12 °C was calculated using the Arrhenius equation resulting in 3.6E-4 h-1 and DT50 = 1929.6 h (80.4 days). Results obtained for dipotassium persulfate were considered representative for the Persulfate Category.