Registration Dossier
Registration Dossier
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EC number: 203-005-8 | CAS number: 102-09-0
Endpoint summary
Administrative data
Description of key information
Additional information
Phototransformation in air
This endpoint has been addressed with two key studies.
The first study is a QSAR Estimation for the phototransformation of Diphenyl carbonate in air, calculated with AOP Program v1.92 of EPI-Suite software (Currenta, 2008).
The calculated half-life of diphenyl carbonate in air due to indirect photodegradation is t1/2 = 4.0 days, considering an OH-concentration of 500 000 radicals/cm³ as a 24 h average. The rate constant for indirect photolysis was 0.0000000000040219 cm³/(molecule*sec).
The second value is taken from a study which investigated UV- and fluorescence emission spectra of the substance (Hoyle et al., 1995). UV-visible adsorption spectra were obtained using a spectrometer and fluorescence spectral measurements.
Low absorption properties in the UV-B range were observed. Therefore no direct photodegradation of diphenyl carbonate is expected.
Hydrolysis
In the key study, the stability of diphenyl carbonate was examined in accordance with the standardised guideline EU Method C.7 under GLP conditions (Bayer, 2001a).
Firstly, a preliminary experiment was carried out in different buffer solutions at pH 4, 7 and 9 at 50 °C. Based on the conclusion that degradation is a pseudo-first order reaction, the secondary experiment was carried out only at pH 4 and 7 at 30 °C. No further testing was required at pH 9 since more than 50 % of diphenyl carbonate had hydrolysed in 2.4 hours at 50 °C and pH 9.
Diphenyl carbonate hydrolyses under environmental conditions, forming phenol and carbon dioxide. Environmentally relevant half-life is 39.9 h at pH 7 and 25 °C.
Further information is available in the form of a supporting study in which the degradation kinetic was determined in accordance with generally accepted scientific principles (Bayer, 2000a).
A saturated solution of diphenyl carbonate in water was stirred at room temperature (23 °C) for 48 h. Following centrifugation, the phases were separated. The concentration of the test material was regularly determined by HPLC.
Diphenyl carbonate hydrolyses in water, forming phenol and carbon dioxide. The half-life is indicated to be 73.5 h at 23 ° C.
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