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EC number: 201-070-7
CAS number: 77-93-0
hydrolysis as abiotic degradation pathway is in the list of endpoints
according to REACH Annex VIII, it is not required if the substance is
readily biodegradable. Triethyl citrate was found to be readily
biodegradable and the endpoint hydrolysis was waived in
accordance with REACH, Annex VIII, Section 220.127.116.11, Column 2.
The phototransformation in air was
calculated with the computer program AOPWIN (v1.92a) program made
available by the U.S. Environmental
Protection Agency. For triethyl citrate an overall OH rate constant
(gas-phase reaction constant) of 7.33 E-12 cm3/molecules-sec and a
half-life of 1.46 days (17.521 hours) was calculated, assuming a 12- hr
day with an OH rate constant of 1.5 E6 OH/cm³. Reaction with N, S and
–OH is estimated to be 0.14 E-12 cm3/molecules-sec, no ozone reaction is
estimated for the compound. The assumed “Hydrogen Abstraction” gives a
value of 7.19 E-12 cm³/molecule-sec, which is almost equal to the
overall OH rate constant of the compound. All calculations were
performed supposing a surrounding temperature of 25 °C. Thus
it can be concluded that the substance will be rapidly degraded in air.
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