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Environmental fate & pathways

Phototransformation in air

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Description of key information

The degradation of trimethylolpropane in air by reaction with OH-radicals was estimated with the generally accepted AOP programme (v1.92). The half  life was calculated to be approx. 28 hours (equivalent to 1.2 days).

Key value for chemical safety assessment

Half-life in air:
1 d

Additional information

Key study:

The degradation of trimethylolpropane in air by reaction with OH-radicals was estimated with the generally accepted AOP programme (v1.92). Based on a 24 h day with an OH radical concentration of 0.5 E06 OH/cm³ the overall OH rate constant was calculated to be 13.7987 E-12 cm³/molecule*sec, leading to a half-life of approx. 28 hours (equivalent to 1.2 days).

Reference: Lanxess, 2009

Further study:

The degradation of trimethylolpropane in air by reaction with OH-radicals was estimated with the Atkinson and with the MOOH-method:

a) Atkinson: Based on a 12 h day with a OH radical concentration of 1.5 E06 OH/cm³, a half-life of 0.86 days was estimated.

b) The calculation according to the MOOH-method resulted in a half-life of 1.85 days.

For this modelling too few data were reported for assessing the reliability. Nevertheless, the result is comparable to the key result.

Reference: Rorije, 1997