Registration Dossier
Registration Dossier
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EC number: 233-237-5 | CAS number: 10099-58-8
Sediment toxicity
Administrative data
Link to relevant study record(s)
Description of key information
NOEC ≥ 2327 mg Lanthanum chloride, anhydrous/kg dw (highest tested concentration) for Chironomus riparius (OECD 218)
Key value for chemical safety assessment
Additional information
The sediment toxicity was investigated according to OECD 218 under GLP conditions (Dietzmann 2010). First instar larvae of Chironomus riparius were exposed to a concentration range in a sediment water system, in which the test item Lanthanum trichloride hexahydrate was spiked into the sediment. Nominal concentrations were 673 - 3407 mg Lanthanum trichloride hexahydrate/kg dw, according to 460 - 2327 mg Lanthanum trichloride, anhydrous/kg dw calculated from the measured La concentration of the stock solution. Chironomid emergence and development rate were measured at the end of the exposure period of 28 days. The EC50 could not be calculated because none of the concentrations tested had shown toxic effects to the chironomids. The NOEC could be stated as ≥ 2327 mg Lanthanum chloride, anhydrous/kg dw.
A further test regarding to the sediment toxicity with Lumbriculus variegatus according to OECD 225 is ongoing. The dossier will be updated as soon as the test results are available.
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