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EC number: 201-114-5
CAS number: 78-40-0
The substance triethyl phosphate is stable to hydrolysis at pH4, 7 and 9..
As no study for the hydrolysis for
triethylphosphate at pH 4, 7 and 9 is available, data from similar alkyl
phosphate in a read-across approach were taken (1. dibutyl phosphate,
2. tris-chlorpropyl phosphate, 3. supporting evidence for stability is
given by literature data for non-guideline studies for triethyl
1. The stability towards hydrolysis of
dibutyl phosphate was investigated at pH 4, 7 and 9 at 50°C according to
OECD Guideline 111 (Hydrolysis as a Function of pH). After 5 days the
recoveries of the substance were in the range of 97.5 % to 104.4%. The
stability was monitored by HPLC analysis using MS-detection. Dibutyl
phosphate is found to be hydrolytically stable at 50°C at all three
pH-values. Therefore it can be assumed that the substance is also stable
at environmental relevant conditions.
3. Mabey & Mill (1978) reviewed the
available published hydrolysis data for a number of chemicals including
phosphoric acid esters. Neutral hydrolysis is reported to be the
dominant process for this class of compounds (phosphoric acid esters) at
pH7. For triethyl phosphate, a half-life of 5.5 years at 25°C is
calculated, based on the rate of hydrolysis at neutral pH. The
second order alkaline hydrolysis rate constant is estimated to be 1.75 x
10 -5 M-1 sec-1 at 27 degrees Celsius (Wolfe, 1980).
The substance triethyl phosphate is stable
to hydrolysis under normal environmental conditions.
Two studies from similar phosphate esters are used in a read-across
approach. The read-across justification is attached to the IUCLID file
in chapter 13.
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