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Short-term toxicity to aquatic invertebrates

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Uronium hydrogen sulphate is of low acute toxicity to aquatic invertebrates.
Uronium hydrogen sulphate readily degrades to urea and sulfuric acid and/or sulfate ions in the environment and these degradation products are considered in the assessment:
- Urea is of low toxicity to Daphnia (24h EC50 >10000 mg/l) and freshwater snails (24h LC50 >10000 mg/l for eggs, juveniles and adults)
- The 48 h LC50 for calcium sulfate dihydrate was found to be >100 mg/L, which is equivalent to >79 mg/L for calcium sulfate anhydrous. No mortalities or adverse effects were noted at this concentration.
It can be concluded that Uronium hydrogen sulphate and its degradation products are not acutely toxic to aquatic invertebrates.

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