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Environmental fate & pathways

Phototransformation in air

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Description of key information

In the atmosphere a half-life of 4.3 hours for ZMBT due to reaction with photochemically produced hydroxyl radicals is estimated by AOPWIN v1.92 with a rate constant of 9.03 *10-11cm3/(molecule*sec), considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average (Currenta, 2010). The estimated half-life in air of ZMBT is much shorter than 48 hours and hence no potential for long-range transport of ZMBT in air is expected.

Key value for chemical safety assessment

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

Additional information

the atmosphere a half-life of 4.3 hours for ZMBT due to reaction with

In the atmosphere a half-life of 4.3 hours for ZMBT due to reaction with photochemically produced hydroxyl radicals is estimated by AOPWIN v1.92 with a rate constant of 9.03 *10-11cm3/(molecule*sec), considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average (Currenta, 2010). The estimated half-life in air of ZMBT is much shorter than 48 hours and hence no potential for long-range transport of ZMBT in air is expected.

photochemically produced hydroxyl radicals is estimated by AOPWIN v1.92 with a rate constant of 9.03 *10-11cm3/(molecule*sec), considering an OH-concentration of 500,000 radicals/cm³ as a 24-h average (Currenta, 2010). The estimated half-life in air of ZMBT is much shorter than 48 hours and hence no potential

for long-range transport of ZMBT in air is expected.