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EC number: 203-570-0
CAS number: 108-30-5
If released into water, succinic anhydride will rapidly hydrolyze; the
half-life of succinic anhydride in water is 4.3 minutes at 25°C.
samples prepared by spiking into water show evidence of the formation of
the acid with time. The sample analysed immediately after preparation
exhibits a small shoulder at the front of the peak (corresponding to ca
6 % succinic acid by peak area), which increased in size for the
sample analysed after one minute, corresponding to approximately 13 % of
succinic acid. The sample analysed after five minutes exhibited a clear
splitting of the peak into the acid and the anhydride, with
approximately 58 % anhydride and 42 % acid. It can therefore be
postulated that the half life of this reaction is in the region of five
minutes (assuming similar responses to both compounds, which is
considered a reasonable assumption based on the structural simularities
of succinic anhydride and succinic acid).
Stability of succinic anhydride was
investigated in aqueous solution. The study was conducted under GLP but
no guideline was followed. Succinic anhydride is rapidly hydrolysed to
succinic acid. The half-life of succinic anhydride in water is
approximately 5 minutes. The study is considered reliable to conclude on
the hydrolytic behaviour of succinic anhydride.
In accordance with REACH Annex VIII column 2, the study does not need to be conducted as the substance is readily biodegradable. However, information on the hydrolysis behaviour of succinic anhydride is available from a study on stability in aqueous solution (Leslie and Moseley, 2010) and secondary literature (SCR, 2006). In the stability study, succinic anhydride and the hydrolysis product were quantified and found to be present in equal amounts after approximately 5 minutes (quantification via peak area). In the literature source the half-life of succinic anhydride in water at 25°C is reported to be 4.3 minutes. In conclusion, it is justified to assume a half life of approximately 5 minutes in aqueous solution for succinic anhydride.
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