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Environmental fate & pathways

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TBBS underlies a fast hydrolysis in water. For risk assessment TBBS and its identified hydrolysis products MBT and tert-butylamine are taken into account.

For TBBS a moderate adsorption potential in soil/sediment was estimated with Adsorption coefficient (log Koc) 2.76 [Kow Method]. MBT has moderate adsorption potential in soil/sediment with the adsorption coefficient (log Koc) of 2.51 – 3.55. Tert-butylamine however has only a low affinity to adsorption with a logKoc of 1.43.

TBBS is essentially non-volatile. The calculation of Henry's law constant with HENRYWIN included in the Estimation Program Interface (EPI) Suite v4.11 revealed a value of 8.58E-005 Pa*m³/mol at 25 °C for the unaffected molecule of N-tert-butylbenzothiazole-2-sulphenamide. The estimated half-life in air of TBBS is much shorter than 48 hours and hence no potential for long-range transport of TBBS in air is expected.

The distribution of TBBS in a "unit world" was calculated according to the Mackay fugacity model level I based on the physico-chemical properties. The main target compartment for TBBS is water of 72.65 % and sediment of 13.31 %, followed by soil of 13.16 %.