Registration Dossier
Registration Dossier
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EC number: 236-921-1 | CAS number: 13548-38-4
Long-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Life cycle NOEC of the test substance to daphnia magna was 66.11 µg Cr/L (equivalent to 0.303 mg/L chromium nitrate) with 95% CL of 47 µg/L to 93 µg/L at the water hardness of 52 mg/L as CaCO3, and was 193.7 µg Cr/L (equivalent to 0.886 mg/L chromium trinitrate) with 95% CL of 129 to 291 µg/L at the water hardness of 100 mg/L as CaCO3. The worst case value of 303 µg/L is taken forward for hazard and risk assessment. In addition one saltwater species Polychaete (Neanthes arenaceodentata) was exposed to chromium trichloride for 293 days resulting in a NOEC of 50.4 mg Cr/L based on the behaviour and reproduction (equivalent to 231 mg/L chromium trinitrate) and this value is taken forward for marine water risk assessment.
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 303 µg/L
Marine water invertebrates
Marine water invertebrates
- Effect concentration:
- 231 mg/L
Additional information
Three long-term toxicity studies for aquatic invertebrates are available in this endpoint.
The chronic toxicity test was conducted to evaluate the chronic toxicity of the test substance to daphnia magna during exposure period.
Life cycle NOEC of the test substance to daphnia magna was 66.11 µg Cr/L (equivalent to 0.303 mg/L chromium trinitrate) with 95% CL of 47 µg/L to 93 µg/L at the water hardness of 52 mg/L as CaCO3, and was 193.7 µg Cr/L (equivalent to 0.886 mg/L chromium trinitrate) with 95% CL of 129 to 291 µg/L at the water hardness of 100 mg/L as CaCO3.
Although the original reference was not available, the result was summarised from Ambient water quality criteria for chromium-1984, which was published by United States Environmental Protection Agency. Thus, the data can be assigned as the reliable with restrictions data. As the recommended test organism and target test substance, it gives the most weight in the three studies.
Other two studies for chromium trichloride are available as well, which is the analogue of chromium nitrate.
The derived the 21-day EC16 to daphnia magna was reported being 0.33 mg Cr/L (equivalent to 1.51 mg/L chromium trinitrate) and further on one saltwater species Polychaete (Neanthes arenaceodentata) was exposed to chromium trichloride for 293 days resulting in a NOEC of 50.4 mg Cr/L based on the behaviour and reproduction (equivalent to 231 mg/L chromium trinitrate).
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