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EC number: 212-084-8 | CAS number: 760-93-0
Methacrylic acid was tested in an acute test to aquatic invertebrates acc. EPA OTS 797.1300 (Aquatic Invertebrate Acute Toxicity test Test) with Daphnia magna. The definitive flow-through acute toxicity of Methacrylic Acid to Daphnia magna was conducted the following nominal concentrations: 7.2, 14, 30, 60 and 120 mg/1.
Forty first-instar daphnids were exposed to each of the test concentrations and control.
The mean measured concentrations calculated from analytical sampling at 0 and 48 hours are as follows: 6.7, 13, 32, 62 and 130 mg/1. The toxicity of Methacrylic Acid based on mean measured test
concentrations were EC50 (48h): > 130 mg/l, NOEC (48h): 130 mg/l
Water quality parameters of temperature, dissolved oxygen and pH were measured in all test concentrations at 0- and 48-hours and were determined to be within acceptable limits. The overall ranges for these
parameters were: daily diluter temperature observations = 20°C, pH = 7.0 - 7.9 and dissolved oxygen= 7.7 - 8.2 mg/1.
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