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Environmental fate & pathways

Phototransformation in air

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Description of key information

The weighted average estimated KOH and t1/2 of C18 TMAC using AopWin v1.92 program (EPIWEB v 4.1) was found to be 3.69 x 10-11 cm3/molecule-sec and 0.29 days, respectively.

Key value for chemical safety assessment

Half-life in air:
0.29 d
Degradation rate constant with OH radicals:
0 cm³ molecule-1 s-1

Additional information

The hydroxyl radical constant (KOH) and reaction half-life (t1/2) for C16 TMAC was estimated using the AopWin v1.92 program of EPIWEB v 4.1. The KOH and t1/2values were calculated on a weighted-average basis using the mole fractions of the individual components. The calculated t1/2is based on a 12 hour daylight hydroxyl radical concentration of 1.5 x 106 molecules (radicals) /cm3 and hydroxyl rate constant of 5.46 x 10 -11 cm3/molecule-sec. The estimated weighted average KOH and t1/2 of C18 TMAC was found to be 3.69 x 10 -11 cm3/molecule-sec and 0.29 days, respectively (US EPA, 2012a).