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Short-term toxicity to aquatic invertebrates

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Description of key information

Sodium acrylate is acute harmful to aquatic invertebrates.

Key value for chemical safety assessment

Additional information

No data on acute toxicity in invertebrates are available for sodium acrylate. Therefore, results from investigations on the structural analogous substance acrylic acid were taken into account for the assessment of short-term toxicity to aquatic invertebrates of sodium acrylate.

An acute toxicity study with Daphnia magna indicated the 48-hour EC50 was 95 mg/L based on mean measured concentrations. This study followed EPA OTS Guideline 797.1300 using a flow-through system. Nominal exposure concentrations ranged from 7.2 to 120 mg/L and mean measured concentrations ranged from 7.9 to 110 mg/L. The NOEC was measured to be 23 mg/L.

In addition, there is a short-term test with Daphnia magna conducted according to 92/69/EEC C2 using static test conditions. Analytical concentration control by spectrophotometrical measurements revealed a recovery rate of > 80 %. Therefore effect values were based on nominal concentrations. The 48-hr EC50 was found to be 47 mg/L.

In a toxicity study with the seawater invertebrate Mysidopsis bahia an 96-hr LC50 of 97 mg/L based on mean measured concentrations was determined. This study was conducted according to the procedures in Title 40 of the Code of Federal Regulations, Part 797, Section 1930, Mysid Shrimp Acute Toxicity Test, using a flow-through test design. Nominal exposure concentrations ranged from 26 to 200 mg/L and mean measured concentrations ranged from 30 to 239 mg/L. The LC0 and NOEC were considered to be 48 mg/L (mean measured).