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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The 96 hour LC50 of 'Chromosal B' (chromium hydroxide sulphate) to the zebra fish (B. rerio), under semi-static conditions with 24-h renewal of pH-adjusted media, was >10000 mg/L, based on nominal concentrations applied in the test.  Based on the absence of abnormal swimming behaviour, the 96 h NOEC was 10000 mg/L (nominal).  

Key value for chemical safety assessment

LC50 for freshwater fish:
10 000 mg/L

Additional information

No studies with dichromium tris(chromate) are available. A read across is proposed to chromium (III) hydroxide sulphate, because the only source of significant environmental exposure will be to the trivalent form of chromium.

A study of the acute toxicity of 'Chromosal B' (chromium hydroxide sulphate) to fish was conducted with zebra fish (B. rerio) exposed to nominal concentrations of 'Chromosal B' ranging from 4526 to 10000 mg/L for 96 hours under semi-static conditions, with renewal of pH-adjusted media at 24 -h intervals. The 96 hour LC50 of 'Chromosal B' was >10000 mg/L, based on the highest nominal concentration applied in the test. Based on the absence of abnormal swimming behaviour, the 96 h NOEC was 10000 mg/L (nominal). The solubility of 'Chromosal B' was low under the conditions of the test. Based on the mean measured concentration of dissolved chromium at the maximum concentration of 'Chromosal B', the 96 hour LC50 was >3.21 mg Cr/L.