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EC number: 219-660-8
CAS number: 2492-26-4
The toxicity of MBT to aquatic algae (Selenastrum capricornutum) was tested according to OECD TG 201 "Alga, Growth Inhibition Test". After 72 hours of exposure, an ECr50 of 0.5mg/L and a NOEC of 0.066 mg/L were obtained (MITI, 1999). The described metabolites of MBT are less toxic to aquatic algae than MBT itself.
SMBT is an organic salt of strong base NaOH and weak acid of MBT and it
is solely marketed as aqueous solution. The presence of MBT determines
the hazard profile of SMBT aqueous solution; and hence the read-across
approach is used to support the risk assessment of SMBT. No valid data
with SMBT as test substance are available for algae and cyanobacteria
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