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Ecotoxicological information

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Since no data on aquatic toxicity for sodium acrylate are available, the assessment is based on the analogous substance acrylic acid (CAS# 79-10-7).

The acute toxicity towards aquatic freshwater organisms was investigated on all three trophic levels according to OECD guidelines involving analytical monitoring. The LC50 value for Salmo gairdneri was determined to be 27 mg/L (measured) and for Danio rerio the LC50 was 222 mg/L (nominal). The EC50 for Daphnia magna was 95 mg/L (measured) and 47 mg/L (nominal), respectively. 

The 72-hour ErC50 for Scenedesmus subspicatus in two investigations was 0.13 and 0.205 mg/L (nominal), respectively. The 96-hour EC50 (cell number) for Selenastrum capricornutum was 0.17 mg/L (nominal). The NOEC for acute toxicity towards algae was determined to be 0.008 mg/L (nominal) for Scenedesmus subspicatus.

In addition, there are reliable data on short-term toxicity towards marine species available. In an OECD guideline (203) study using a flow-through system with sheepshead minnow a LC50 (96h) value was analytically estimated to be 236 mg/L. In a toxicity study with the seawater invertebrate Mysidopsis bahia an 96-hour 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.

BAMM (1996) conducted a 21-day chronic study with Daphnia magna under flow-through conditions according to EPA OTS 797.1330. The NOEC for reproduction was based on the parameter YAD (Young per adult reproductive day) and determined to be 19 mg/L; the corresponding LOEC (reproduction) was 38 mg/L. Based on the statistical endpoint of adult mean survival from this 21-day Daphnia magna chronic toxicity study, MATC (= geometric mean of LOEC and NOEC) limits were determined to be 8.1 mg/L (LOEC) and 3.8 mg/L (NOEC). The geometric mean of the MATC limits is 5.5 mg/L. The day 21 EC50 based on immobility/mortality of adult daphnia was determined to be >8.1 mg/L. In addition, a 21-day chronic study with Daphnia magna was conducted under semi-static conditions according to OECD TG 211. The NOEC for maternal survival was determined to be 7 mg/L, the NOEC for reproduction based on young per adult was 12 mg/L (nominal).

In order to investigate the toxicity towards domestic activated sludge, an oxygen consumption inhibition test according to ISO standard was conducted (BASF AG 1993). The resulting EC20 was 900 mg/L.