Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

Hydrolysis:

Read-across to similar phosphoric acid alkyl esters showed that these group of substances is stable at pH 4, 7 and 9.

Several reports with Triethylphosphate and 2 similar phosphoric acid alkyl esters show that such substances are stable at pH4, 7 and 9

The substance triethyl phosphate is stable to hydrolysis under normal environmental conditions.

Biodegradation:

The biodegradation of the substance was investigated in a modified MITI test corresponding to OECD 301C . The degree of biodegradation by BOD is reported to be 0% (CITI, 1992). The substance triethyl phosphate cannot be considered readily biodegradable.

In a Zahn-Wellens test (OECD 302C). 98% biodegradation of the test substance was seen in 21 days under the conditions of this study (Kanne, 1987). However only 18% biodegradation were seen at the relevant interval of 7 days. The substance triethyl phosphate is not considered inherently biodegradable.

Further, calculations with QSARs are available demonstrating that Triethyl phosphate is not readily biodegradable and ultimate biodegradation may be reached within weeks.

Based on the data from biodegradation and from hydrolysis, the substance is considered to be potentially P/vP. For this reason further investigations in water-sediment of soil are not necessary.

Bioaccumulation:

The substance triethyl phosphate has no potential for accumulation. (BCF <1.3)

 

Adsorption:

The obtained logKoc values of 1.64 and 1.81 (EPIWIN) indicate a has a negligible sorption potential to soil and sediment.

Henry's Law Constant:

The Henry´s law constant (HLC) was estimated to be 5.91*10-02 Pa-m3/mole (EPIWIN/Bond estimation method).