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EC number: 227-579-4
CAS number: 5895-46-5
Toxicity of dineodymium tricarbonate was approximated using data available for the closely related compound, dicerium tricarbonate. The 3hr NOEC for inhibition of activated sludge respiration was determined to be 1000 mg/L.
Because data concerning the toxicity of dineodymium tricarbonate to
microorganisms was not available, toxicity information for the closely
related compound, dicerium tricarbonate, was used to estimate the
A limit test was conducted in accordance with the EU Commission
Directive 92/69/EEC (C.1, C.2, and C.3) and the OECD Series on Testing
and Assessment No. 23 (Guidance Document on Aquatic Toxicity Testing of
Difficult Substances and Mixtures, 2000). One concentration of dicerium
tricarbonate of nominal 1000 mg/L was used to demonstrate that dicerium
tricarbonate has no toxic effect on activated sludge microorganisms up
to and including this concentration.
Dicerium tricarbonate had no significant inhibitory effect on the
respiration rate of activated sludge after the incubation period of
three hours at the limit test concentration of 1000 mg/L. Thus, the
3-hour NOEC of dicerium tricarbonate to activated sludge microorganisms
was at the limit of water solubility of dicerium tricarbonate under the
test conditions, or at 1000 mg/L.
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