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EC number: 230-638-7 | CAS number: 7237-83-4
Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
Toxicity of tris(oxiranylmethyl) benzene-1,2,4-tricarboxylate to Activated Sludge in a Respiration Inhibition Test
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 28.9 mg/L
Additional information
In comparison to the inoculum controls the respiration rate of the activated sludge was slightly inhibited by 8.1% at the lowest nominal test concentration of 10 mg/L. At the next higher concentrations of nominal 32 and 100 mg/L the inhibition was 10.8%. The respiration rate of the activated sludge was moderately inhibited by 27.0% at 320 mg/L. At a nominal concentration of 1000 mg/L, the respiration rate was inhibited by 29.7% at a plateau. Concentrations exceeding 1000 mg/L nominal were not tested.
Based on measured inhibition rates, the 3-hour EC10, and EC20and their 95% confidence limits were determined. Based on measured inhibition rates, the 3-hour EC50could not be quantified because up to the highest nominal test concentration of 1000 mg/L less than 30% inhibition was noted after three hours incubation
The results are listed below:
Parameter EC10 EC20 EC50
Value [mg/L] 28.9 211.4 n.d.
lower 95%-cl 0.0 33.6 n.d.
upper 95%-cl 100.2 742.8 n.d.
n.d.: not determined due to mathematical reasonsInformation 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.
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