Registration Dossier
Registration Dossier
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EC number: 235-595-8 | CAS number: 12336-95-7
Endpoint summary
Administrative data
Description of key information
Research has been performed on a number of chromium salts.
Chromium occurs naturally in water and is not considered to be accumulative and will biotransform into alternaitve organic and inorganic salts, although will remain as Cr 3+.
Algae appear to be the most sensitive organism for short term exposure (significant inhibition at just over 1 mg/l for the sulphate), but fish NOEC is reported to be 0.15 mg/l for chronic exposure (equivalent to 0.6 mg/l for the substance with nominal molecular weight of 210).
The UK Environment Agency has proposed a mximum limit and this is used to determine the PNEC Aquatic of 47 µg/l for Cr III.
Although chromium salts are potentially inhibitory to algal growth in laboratory tests, under alkaline environmental conditions the solubility of Cr3 + is typically less than 1 mg/l and will very likely precipitate as carbonate or hydroxide and not cause adverse effects.
However, in view of chronic toxicity data on earliy life stage of fish, Aquatic Chronic 2 is proposed as a classification
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