Registration Dossier
Registration Dossier
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EC number: 231-635-3 | CAS number: 7664-41-7
Toxicity to terrestrial arthropods
Administrative data
Link to relevant study record(s)
- Endpoint:
- toxicity to non-target arthropods field studies (NTA other than pollinators)
- Type of information:
- read-across from supporting substance (structural analogue or surrogate)
- Adequacy of study:
- weight of evidence
- Justification for type of information:
- see read across justification
- Reason / purpose for cross-reference:
- read-across source
- Duration:
- 104 wk
- Dose descriptor:
- NOAEL
- Effect conc.:
- 182.7 g/ha
- Nominal / measured:
- nominal
- Conc. based on:
- act. ingr.
- Remarks on result:
- not measured/tested
- Details on results:
- Ammonium sulfate, simulating acid rain, was deposited in monthly applications at total amount of 708 kg ammonium sulfate/ha/year to a field planted with Picea abies.
In the first year evaluation, a significant increase of the numbers of Cryptostigmata in the organic layer to more than double of control level was detected. In the second year, the abundances of Cryptostigmata were still high, but the differences to control were not significant. On both occasions the numbers of Collembola in the organic and top 6 cm mineral layers were significantly increased relative to controls.
Applying the conversion factor from ammonium sulfate to NH3, the amount of 708 kg ammonium sulfate/ha/year corresponds to 182.7 kg/ha/year.
Reference
Description of key information
An addition of ammonium sulfate corresponding to an addition of of 182.7 kg NH3/ha/year significantly increased of the numbers of Cryptostigmata in the organic layer. Therefore, toxicity to terrestrial arthropods at environmentally relevant concentrations is not predicted.
Key value for chemical safety assessment
- Long-term EC10, LC10 or NOEC for soil dwelling arthropods:
- 140.36 mg/kg soil dw
Additional information
An addition of ammonium sulfate corresponding to an addition of of 182.7 kg NH3/ha/year significantly increased of the numbers of Cryptostigmata in the organic layer. Therefore, toxicity to terrestrial arthropods at environmentally relevant concentrations is not predicted. An addition of 182.7 kg NH3/ha/year corresponds to 140.36 mg NH3/kg dw which is taken as worst case NOEC.
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