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EC number: 928-842-2 | CAS number: 1184648-08-5
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
EC50 (48h), daphnia [(R)-2-(4-hydroxyphenoxy)-propanoic acid] > 100 mg/L (Neumann 1996)
Key value for chemical safety assessment
Fresh water invertebrates
Fresh water invertebrates
- Effect concentration:
- 100 mg/L
Additional information
The acute toxicity of the test item on Daphnia magna was determined in fresh water during a 48-hour period under static conditions according to the OECD-Guideline No. 202 and FIFRA Guideline No. 72-2 under GLP. After 48 h of exposure, immobilization of daphnids was observed only at the highest concentration tested (100 mg/l: 15% after 48 h exposure). The 48h EC 50 was determined to be >100 mg/l and the 48h NOEC was 58 mg/l.
Potassium (R)-2-(4-hydroxyphenoxy)propionate, when dissolved in water becomes equal to the test item (R)-2-(4-hydroxyphenoxy)propanoic acid and toxicity to daphnids of the potassium salt is therefore equal to the toxicity to daphnids measured for the acid. It can therefore be concluded by read-across without reasonable doubt that the EC50 (48h) of potassium (R)-2-(4-hydroxyphenoxy)propionate is >100 mg/L and the NOEC is 58 mg/L.
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