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Environmental fate & pathways

Phototransformation in air

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Description of key information

After evaporation or exposure to air, the reaction mass will be rapidly degraded by photochemical processes.

Key value for chemical safety assessment

Additional information

The rate constants for indirect photolysis via reaction of the reaction mass of 2 -piperazin-1 -ylethanol, piperazine-1,4 -diethanol and piperazine (50, 25 and 25 %)

with OH radicals was estimated for the major components. The half lives were calculated assuming OH radicals at a concentration of 0.5 E06 molecule/cm³ and a 24 h day (SRC AOP v1.92 of EPI Suite v4.11; BASF SE, 2013).

2 -Piperazine-1 -ylethanol (CAS 103 -76 -4):

- degradation rate: 186.6 E-12 cm³/molecule*s

- DT50: 2.1 h

Piperazine-1,4 -diethanol (CAS 122 -96 -3):

-degradation rate: 204.4 E-12 cm³/molecule*s

- DT50: 1.9 h

Piperazine (CAS 110 -85 -0):

- degradation rate: 168.7 E-12 cm³/molecule*s

-DT50: 2.3 h

In conclusion, it can be assessed that the reaction mass will be rapidly degraded by photochemical processes after evaporation or exposure to air.