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Environmental fate & pathways

Phototransformation in air

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In the atmosphere a half-life of 8.5 hours for SMBT due to reaction with photochemically produced hydroxyl radicals is estimated by AOPWIN v1.92 with a rate constant of 4.5 *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 SMBT is much shorter than 48 hours and hence no potential for long-range transport of SMBT in air is expected.

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