Registration Dossier
Registration Dossier
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EC number: 205-736-8 | CAS number: 149-30-4
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
The most sensitive result of acute toxicity of MBT to fish was obtained in a flow-through toxicity test on rainbow trout with a 96-hour LC50 of 0.73 mg/l (Monsanto, 1981). MBT can be rapidly degraded by direct photolysis in water (CMA, 1989) to benzothiazole (BT) (Brownlee, 1992) and rapidly oxidized by atmospheric oxygen in water to mercaptobenzothiazole disulfide (MBTS) (Hansson & Agrup, 1993). The most sensitive results of the acute toxicity of BT to fish (96h-LC50=8.1 mg/l) and the prolonged toxicity of BT to fish (14d-LC50=5.6 mg/l) are reported by SRI International (1981) using a flow-through system with Oncorhynchus mykiss. For MBTS no toxic effect was observed to fish (Oncorhynchus mykiss) up to its water solubility (Monsanto, 1981).
Key value for chemical safety assessment
Additional information
Further tests reported a 96-hour LC50 of > 2.8 mg/l on Oryzias latipes ( National Institute of Technology and Evaluation, 1999), a 96-hour LC50 of 1.6 mg/l (geometric mean) on Brachydanio rerio (Bayer, 1988) and a 96h-LC50 of 11 mg/l for Pimephales promelas in static conditions (Monsanto, 1979).
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