Registration Dossier
Registration Dossier
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EC number: 231-209-7 | CAS number: 7446-81-3
Endpoint summary
Administrative data
Description of key information
Additional information
No experimental data on the test substance is available. Sodium acrylate (NaA) is dissociating fast in aqueous media (Henderson – Hasselbach calculation). Therefore, the evaluation of the terrestrial toxicity is based on a weight of evidence approach using the data of the structural analogue acrylic acid (AA) (CAS 79-10-7) (for WoE information, see chapter 13.2).
The model calculations for the distribution of NaA and AA (see chapter 5.4.3) and the adsorption data (see chapter 5.4.1) indicate a very low ability of NaA to bind to soil particle. Therefore, a possible exposition of soil organisms will be mainly via the pore water fraction of the soil. In order to this, the considerations about the dissociation of NaA in aqueous media (see WoE justification in chapter 13.2 for details) can be although transferred to terrestrial toxicity in this case. For organisms with an acidic digestive system, the total shift of the reaction equilibrium towards AA can be assumed after dissociation. The comparison of toxicological data for AA and NaA indicates a higher toxic potential of AA in general (see chapter 7). Due to these reasons and the structural similarity of NaA and AA the data for AA can be used with a high reliability to assess the above described terrestrial endpoints. Furthermore, these data will probably lead to an overestimation of the toxic potential of NaA in the environment and can be seen as worst-case assumption.
An acute earthworm toxicity study was conducted in Eisenia foetida foetida according to the EU method 88/302/EEC, C.8 and in compliance with GLP regulations (Huels AG, 1995). Groups of ten earthworms per replicate (4 replicates/treatment group) were exposed to 1000 mg acrylic acid/kg dry weight in an artificial soil (limit test). A control was run in parallel. Mortality was recorded after 7 and 14 days. All test animals survived the treatment until test termination. Thus, the LC50 was determined to be greater than 1000 mg/kg dry weight. A study on the toxicity of a range of concentrations of acrylic acid towards soil micro-flora was conducted according to a draft version of OECD TG 217. Concentrations of acrylic acid up to 100 ppm were non-toxic to the soil micro-flora, while a concentration of 1000 ppm was highly toxic and depressed respiration rates of soil micro-flora completely. Thus, the EC0 for soil micro-flora based on effects on carbon cycle was determined to be 100 ppm (= 100 mg/kg soil ww).
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