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EC number: 411-790-5 | CAS number: -
Table: Acute immobilization of daphnia after 24 and 48 hours
Measured test concentration in mg/L (%-filtrate)
Number immobile at 24h
Number immobile at 48h
0 + Cremophor
An Acute Immobilization Study was performed with Daphnia magna according to OECD 202. The test was performed using filtrates of a supersaturated solution of KY-MA (at 1000 mg/L). Three of the filtrate levels (10%, 32% and 100%) were then analyzed for actual KY-MA concentration.
Concentrations of 0.62 mg/L (32% filtrate) showed greater than 50% immobility, while the next lowest measured concentration (0.19 mg/L) (10% filtrate) showed no effect. A concentration between these two was not measured, though this concentration was estimated to be 0.34 mg/L, also showing no immobilization. Based on this, the 48h-EC50 value is assumed to be higher than 0.34 mg/L, which is higher than the maximum solubility of KY-MA in water (0.006 mg/L).
There was no correlation between amount of filtrate and level of immobilization. The 32% filtrate showed the highest levels of immobilization at 48 hours, and had the highest start concentrations. Finally, the concentrations decreased between t0 and t48 in the 10% and 32% filtrate concentrations, but increased in the 100% concentration.
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