Registration Dossier
Registration Dossier
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EC number: 233-796-5 | CAS number: 10361-80-5
Endpoint summary
Administrative data
Description of key information
Additional information
Short-term toxicity
One study was identified on the acute toxicity of praseodymium to fish (Rhodia, 1997). This study, which was performed using Pr(NO3)3, was assigned a reliability score of 3 because the test concentrations were not analytically verified and precipitation may have occurred; which could have led to an underestimation of the ecotoxicity. Still, the study was used as a supporting study. Rainbow trout were observed under semi-static exposure conditions for 96 h according to EU method C1. The 96-h LC50 (nominal-based) was determined to be 0.71 mg Pr(NO3)3/L (corresponding to a 96 -h LC50 of 0.306 mg Pr/L). Based on these results Pr(NO3)3 is considered to be very toxic to fish.
One study was identified on the acute toxicity of praseodymium to aquatic invertebrates. This study from Hefner (2013), which was performed using Pr(NO3)3, was assigned a reliability score of 1. In this study Daphnia magna juveniles were exposed to praseodymium under semi-static conditions according to OECD guideline 202. The 48-h EC50 was calculated based on mean measured concentrations and was 0.9 mg Pr/L (corresponding to 2.0 mg anhydrous Pr(NO3)3/L). Based on these results, Pr(NO3)3 is considered toxic to aquatic invertebrates.
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