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EC number: 200-262-8
CAS number: 56-23-5
Short-term toxicity to aquatic invertebrates: EC50(48h) = 35 mg/L for daphnids, acute toxicity, static (OECD TG 202).
There is no fully reliable study of acute toxicity of CTC on daphnia
available. There is a weight of evidence that the EC50-48h must be in
the range 10 to 100 mg/L, based on the studies published by Bazin et
al., 1987: EC50-24h = 97 mg/L, Knie et al, 1983: LC50 -24h = 28 mg/L and
LeBlanc, 1980: EC50-48h = 35 mg/L. The data published by Japanese MoE
(EC50-48h = 8.1 mg/L) seems to be an outlier, specially when we consider
the fully reliable chronic toxicity study (Thompson, 1997) where it was
observed no mortality among parent animals, during 21 days up to the
highest tested concentration: 5.7 mg/L (measured).
Consequently, we will use the value from LeBlanc as key value for acute
toxicity to invertebrates.
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