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EC number: 619-635-5 | CAS number: 12567-73-6
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
Short-term toxicity to aquatic invertebrates: Key study: results from a study report leading to the conclusion that the effective concentrations of Zirkonium-tetrakis(isobutyrato), in terms of WAFs (a) were:
Parameter (in mg/L, loading rate):
EC0/24h (b): ≥ 100mg/L
EC0/48h (b): ≥ 100mg/L
.
Key value for chemical safety assessment
Additional information
Key study:
The acute toxicity of Zirkonium-tetrakis(isobutyrato) to Daphnia magna was determined in a 48 hours static test.As the test substance was of only limited solubility in water, an aqueous extract from a "loading rate" of 100 mg (target value) Zirkonium-tetrakis(isobutyrate) per L reconstituted water was prepared. This water accommodated fraction (WAF) was used as the highest test substance concentration (C5) and was further diluted with reconstituted water to obtain the concentrations WAF/2, WAF/4, WAF/8 and WAF/16.
Results were the following:
- Immobilisation after 48h (in terms of WAFs): 0/20 daphnia in the control group and at WAF/16, WAF/4 and WAF/2. 1/20 daphnia at WAF/8 and WAF.
- After 48 h exposure time no daphnia were trapped at the water surface in the test substance groups.
- Immobilisation of control group daphnia was 0% at the end of the test (guideline: maximum of 10%). There were no control daphnia trapped at the water surface.
It is concluded that the effective concentrations of Zirkonium-tetrakis(isobutyrato), were:
Parameter (in mg/L, loading rate):
EC0/24h (b): ≥ 100mg/L
EC0/48h (b): ≥ 100mg/L
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