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Environmental fate & pathways

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A hydrolysis half-life time of CBS of 12.5 h in buffered deionized water at pH 7.0 and 25°C with light excluded was observed. The sole hydrolysis product was identified to be benzothiazole (CAS: 95-16-9).

The UV spectrum of CBS indicates that photodegradation under environmental conditions is possible. A half-life of 26 minutes of CBS due to direct phototransformation in water at midday in August was obtained. The indirect atmospheric oxidation rate by reaction with OH-radicals was estimated by using AOPWIN v1.92 to be 7.95*10-11 cm3/(molecule*sec) and half-life thus 4.8 h. The estimated half-life in air of CBS is much shorter than 48 hours and hence no potential for long-range transport of CBS in air is expected.

The main abiotic degradation products of CBS and its metabolites of MBT and MBTS are BT and its further product as BTon. In the EU-Risk Assessment, BT and BTon are reported as persistent under environmental conditions. Another described metabolite from CBS is MeSBT, which is also reported as resistant both to biodegradation and photolysis.