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Toxicity to microorganisms

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Uronium hydrogen sulphate has no inhibitory effect on sewage sludge microorganisms.
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:
- With sulphate (as calcium salt), the 3 h EC50 value was >1000 mg/L and the NOEC was 1000 mg/L (the highest dose tested, OECD 209, GLP)
- With urea, the 72 hour toxicity threshold of Entosiphon sulcatum to urea was 29 mg/l, and the 16 hour toxicity threshold of urea to Pseudomonas putida was > 10000 mg/l. Moreover, urea sulphate is considered as readily biodegradable.
It can be concluded that Uronium hydrogen sulphate and its degradation products are no inhibitory effect on sewage sludge microorganisms.

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