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Environmental fate & pathways

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Penta-1,3-dieneis a volatile substance which is difficult to test for biodegradation in the experimental systems. The estimated QSARs data on environmental degradation ofpenta-1,3-dieneare summarized in table below. Overall, the QSAR estimated data suggest that this substance will degrade fast in the environment.

 

Table Degradation rates ofpenta-1,3-diene

 

Degradation rate in water:

Abiotic transformation:

Hydrolysis is not a relevant degradation route for the substance.

 

Biotic transformation:

DT50=8.67 days (208 hours)

 

Degradation rate in sediment:

DT50=78 days (1873 hours)

 

Degradation rate in soil:

DT50=17.33 days (416 hours)

 

Degradation rate in air:

DT50=1.71 hours

DT50 (for reaction with hydroxyl radicals)=0.102 days;

DT50 (for reaction with ozone)=0.218 days

 

 

Based on the data summarized in this section of CSR,penta-1,3-dieneis considered to degrade rapidly via abiotic or biotic degradation paths.