Registration Dossier
Registration Dossier
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EC number: 233-038-3 | CAS number: 10025-73-7
Endpoint summary
Administrative data
Description of key information
Additional information
Chromium trichloride (anhydrous) is insoluble in cold water and thus relevant concentrations leading to aquatic toxicity only can build up slowly in test media. Therefore, aquatic toxicity is typically assessed by testing chromium trichloride hexahydrate which is very well soluble in water (585 g/L) as a dark violet solution. Hence, all aquatic toxicity data are established with chromium trichloride hexahydrate and other chromium(III) salts such as chromium trinitrate nonahydrate, which is also very well soluble in water (1052 mg/L), can be used as alternative chromium(III) source to assess aquatic toxicity of chromium trichloride.
Toxicity data of chromium trichloride hexahydrate were assessed as follows:
Short-term toxicity to freshwater fish: LD50 (96h, rainbow trouts) was found being 57.4 mg/L
Short-term toxicity to saltwater fish: LD50 (96h, mummichog) of 161 mg/L
Long-term toxicity to freshwater fish: NOEC (early life stage test, 72 days) was 0.246
Short-term toxicity to freshwater invertebrates: EC50 (daphnia magna, 48h) of 63.3 mg/L
Short-term toxicity to marine water invertebrates: EC50 of 34.7 mg/L
Long-term toxicity to freshwater invertebrates: NOEC of 3.4 mg/L for daphnia magna reproduction
Long-term toxicity to marine invertebrates: NOEC of 258 mg/L for Polychaete (Neanthes arenaceodentata) (293 days of exposure)
Toxicity to freshwater green algae: EC50 of 2.0 mg/L and NOEC of 0.41 mg/L
Toxicity to microorganisms: EC50 of 256 mg/L (Protozoa (Tetrahymena pyriformis), 9 hour value)
As chromium trichloride hexahydrate but also chromium trinitrate nonahydrate are both acidic in water, pH effects play a certain role when these substances are tested, in particular towards juvenile fish. Also the coloured nature of the solutions does have an effect on light transmission hindering green algae growth upon exposure. Thus, NOECs for long term toxicity to fish and algae are apparently influenced by such secondary effects. Nevertheless, the NOECs derived were used for derivation on PNEC values for the different environmental compartments.
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