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EC number: 215-160-9
CAS number: 1308-38-9
Measured concentrations of dissolved Cr and observations of fish
mortality and sub-lethal effects following exposure to 'Chromoxid-gruen
GN' are presented in the table below:
Chromoxid-grün GN' nominal concentration (mg/L)
Dissolved Cr measured concentration (µg/L)
Mortality (%)after 96 hours
10000 (abiotic, no fish)
a Based on observations of swimming behaviour after 2, 24, 48, 72 and 96 h exposure. The fish in the 'Chromoxid-gruen GN' treatment were obscured from view by suspended test material at the 2 h observation.
rate and extent to which chromium (III) oxide produces soluble
(bio)available ionic and other chromium-bearing species in environmental
media is limited. Further, the poor solubility of chromium (III) oxide
is expected to determine its behaviour and fate in the environment, and
subsequently its potential for ecotoxicity. Therefore, the fate and
toxicity of chromium (III) oxide in the environment is evaluated by
assessing the fate of its ecotoxicologically relevant moiety, the
chromium (III) ion, and read-across to data available for other chromium
(III) substances is applied.
accordance with ECHA’s Guidance on IR & CSA, Appendix R.7.13-2 (2008),
the poorly soluble substance chromium (III) oxide is evaluated by
comparing the dissolved chromium (III) ion level resulting from the T/Dp
at a loading rate of 1 mg/L after 7 d with the lowest acute effect
concentration as determined for the (soluble) chromium (III) ion. The
lowest reliable acute effect concentration determined for the (soluble)
chromium (III) ion is a LC50 of 4.0 mg Cr(III)/L observed in a 96-h
acute toxicity test on the effects of chromium (III) nitrate to juvenile
Oncorhynchus mykiss in a flow-through exposure system (Stevens &
Chapman, 1984). Dissolved chromium concentrations of <0.01 microg/L in
the T/Dp after 7 days at pH 6 (i.e. the pH that maximizes the
dissolution) are significantly lower than the lowest acute effect
concentration derived for fish (i.e. LC50 of 4.0 mg Cr(III)/L). Hence,
chromium (III) oxide is not sufficiently soluble in environmental media
to cause acute toxicity to fish at the level of the lowest acute effect
concentration for dissolved chromium (III) ions (expressed as LC50).
further information on the applied read-across approach and the
evaluation of the poorly soluble substance chromium (III) oxide, please
refer to the section "Cr2O3_Aquatic toxicity".
effects on survival and swimming behavior of freshwater fish Danio rerio
were not observed at the nominal limit concentration of 10,000 mg
Cr2O3/L in an acute toxicity study with chromium (III) oxide (Caspers,
1992). The solubility of Cr2O3 was however low under the conditions of
the test. Based on the mean measured dissolved chromium concentration at
the nominal limit concentration, the 96-h LC50 corresponds to >1.0
microg Cr/L (equivalent to 2.9 microg dissolved chromium (III) oxide).
on the poor solubility of chromium (III) oxide in environmental media,
acute toxicity to fish is not expected.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
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