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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

An EL50 of >1000 mg/L was determined for rosin, fumarated.
The EL50 for resin acids and rosin acids, maleated, calcium salts was determined to be >100 mg/L.
The EC50 for resin acids and rosin acids, maleated, sodium salts was determined to be >38 mg/L.

Key value for chemical safety assessment

Additional information

Differences in ecotoxicity have been observed between fumarated and maleated category members. For this reason, read across between fumarated and maleated substances is not used for ecotoxicity endpoints.

For fumarated substances, ecotoxicity endpoints and environmental classification are assessed based on data for the substance itself, where available, or based on read across from another fumarated rosin substance. One set of PNECs has been derived to cover all fumarated rosin substances, based on the most sensitive ecotoxicity result available for any fumarated rosin substance.

The ecotoxicity of maleated substances is affected by the solubility of the test item, with more soluble substances rosin, maleated and resin acids and rosin acids, maleated sodium salts showing higher aquatic toxicity compared to the poorly soluble substance resin acids and rosin acids, maleated calcium salts. Therefore, ecotoxicity endpoints and environmental classification of resin acids and rosin acids, maleated calcium salts are completed based on data for the substance itself rather than using read across from more soluble maleated substances. However, PNECs have been derived based on pooled data, with one set of PNECs derived to cover all maleated substances within the category. The most sensitive result for any maleated rosin substance has been used as the key value for PNEC derivation.

Algal data are available for some category members, and the results are outlined below.

Rosin fumarated

One GLP-compliant, guideline study is available for Rosin, fumarated (Inveresk, 2002). The study used WAFs, with no analytical verification of test concentrations. The EL50 was determined to be greater than the highest test concentration, 1,000 mg/L.

Rosin maleated

No data are available for rosin, maleated for this endpoint. Data are read across from resin acids and rosin acids, maleated sodium salts as another partially soluble maleated rosin substance.

Resin acids and rosin acids, maleated sodium salts

A GLP-compliant study following OECD guideline 201 is available for resin acids and rosin acids, maleated, sodium salts (Laus, 2013). The study utilised WAF techniques with analytical verification based on DOC. The test item was supplied as a 50% solution but results were based on geometric mean measured concentrations. The EC50 for resin acids and rosin acids, maleated, sodium salts is >38 mg/L, based on growth rate and the NOEC is 8 mg/L.

Resin acids and rosin acids, maleated calcium salts

A GLP-compliant study following OECD guideline 201 is available for resin acids and rosin acids, maleated, calcium salts (Laus, 2013). Test solutions were prepared as WAFs but measured test concentrations were in the same range as controls based on analysis of DOC. Results are based on nominal loading rates. The EL50 for resin acids and rosin acids, maleated, calcium salts is >100 mg/L.