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EC number: 221-110-7 | CAS number: 3006-82-4
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The hydrolysis of tert.-Butylperoxy- 2-ethylhexanoat in different pH buffer solutions was investigated according to OECD Guideline No. 111 and EU method C.7. The analysis of tert.-Butylperoxy- 2-ethylhexanoat was carried out with a HPLC method using UV detection. Sterile aqueous buffer solutions of different pH values (pH 4, 7, 9) were prepared with the test substance solutions and buffer solutions. The hydrolysis of TBPEH was examined at pH 4, 7 and 9 at three temperatures: 15 ± 0.5 degree C, 37 ± 0.5 degree C and 60 ± 0.5 degree C. TBPEH concentrations in the buffer solutions were: ca. 22 mg/L (ca. 0.1 mM). The calculated half lives of the hydrolysis reactions at pH 4, pH 7 and pH 9 are given in the following table:
Based on the results obtained, test substance tert.-Butylperoxy- 2-ethylhexanoat hydrolytically unstable at pH 4, pH 7 and pH 9 under the conditions investigated.
The hydrolysis of TBPEH was determined at various pH values and temperatures. The rate of hydrolysis decreased with increasing pH and temperature. Hydrolysis increased with temperature and decreasing pH. From values obtained in the key study, the environmentally relevant rate of hydrolysis at pH 7 and 12 °C was calculated using the Arrhenius equation and resulted in a hydrolysis rate of 1.84E 03 h 1 and a DT50 of 376.3 h (15.68 days).
The hydrolysis behaviour of TBPEH was assessed in two studies according to EU method C.7 and OECD guideline no. 111. From values obtained in the key study, the environmentally relevant rate of hydrolysis at pH 7 and 12 °C was calculated using the Arrhenius equation and resulted in a hydrolysis rate of 1.84E 03 h 1 and a DT50 of 376.3 h (15.68 days).
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