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EC number: 204-424-9
CAS number: 120-78-5
The actual concentrations of test solutions with the lowest (3.2 mg/L)
and highest (1000 mg/L) nominal concentrations were analyzed at both the
beginning and the end of the exposure. The analyzed results were always
below 0.3mg/L. MBTS has an estimated water solubility in the range of
0.27 - 0.37 mg/L at 25°C and hence the result from this study can be
interprated as no effect up to water solubility of MBTS. The observed
effect is most probably due to the direct impact from undissolved
No acute toxicity of MBTS to Daphnia magna was observed up to its water
solubility (<=0.3 mg/L) at pH 8.0-8.2 and 21-22°C according to EU Method
C.2 (Acute Toxicity for Daphnia) (Bayer AG, 1993).
No acute toxicity of MBTS to Daphnia magna was observed up to its water solubility (<=0.3 mg/L) at pH 8.0-8.2 and 21-22°C according to EU Method C.2 (Acute Toxicity for Daphnia) (Bayer AG, 1993).
Monsanto (1979) reported a 48h-EC50 of 82 mg/l of MBTS to Daphnia magna
without analytical monitoring. This value was based on nominal
concentration and precipitations were observed in all concentrations
tested from 10 to 100 mg/L; and hence the observed effect is due to both
dissolved and undissolved substance.
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