Registration Dossier

Environmental fate & pathways

Endpoint summary

Administrative data

Description of key information

Additional information

The estimated QSARs data on environmental degradation of tributyl phosphate are summarized below. Overall, the QSAR estimated data suggest that this substance will degrade fast in the environment.

Degradation rate in water:

Abiotic transformation:

Hydrolysis DT50:


pH5 =11.47 years

pH6 =11.47 years

pH7 =11.45 years

pH8 =11.29 years

pH9 =9.865 years

pH10 =4.366 years


Biotic transformation:

DT50=8.67 days (208.1 hours)

Degradation rate in sediment:

DT50=78 days (1873 hours)

Degradation rate in soil:

DT50=17.34 days (416.2 hours)

Degradation rate in air:

DT50=0.14 days (3.257 hours)

DT50 (for reaction with hydroxyl radicals)=1.628 hours


Based on the data summarized in this section of CSR, tributyl phosphate is considered to degrade rapidly in the environment via abiotic or biotic degradation paths.