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EC number: 209-156-6 | CAS number: 557-09-5
- Life Cycle description
- Uses advised against
- Endpoint summary
- Appearance / physical state / colour
- Melting point / freezing point
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- Density
- Particle size distribution (Granulometry)
- Vapour pressure
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- Additional physico-chemical information
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- Nanomaterial aspect ratio / shape
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- Nanomaterial Zeta potential
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- Endpoint summary
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Toxicity to microorganisms
Administrative data
Link to relevant study record(s)
Description of key information
A nitrification inhibition test with Zn sulfate on activated slugde originating from a municipal wastewater treatment plant was performed leading to a NOEC of 100 µg Zn/L.
Key value for chemical safety assessment
- EC10 or NOEC for microorganisms:
- 100 µg/L
Additional information
Several data were available for this endpoint. Formerly (ECB 2008), and in the REACH-registrations of a number of zinc substances of November 2010, a PNEC of 52 µg/L for STP was derived, based on the lowest EC50 of 5.2 mg Zn/L observed in a sludge respiration inhibition test (Dutka et al. 1983). According to the guidance (ECHA 7.8.17.1) preference should be given to nitrification inhibition because respiration inhibition is a less sensitive endpoint. A study conducted by Juliastuti et al. (2003) reported a NOEC of 0.1 mg Zn/L in an ISO 9509 nitrification inhibition test. Applying the rules for PNEC setting (ECHA R.10, table R.10.6) this result yields a PNEC STP of 100 µg Zn/L (AF of 1).
ZnO nano
For nano ZnO, only one value was found: EC10 (180 min): 720 mg/L test mat. (nominal) based on: respiration rate
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