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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

The EL50 is determined to be >100 mg/L for rosin, fumarated.
The EL50 for resin acids and rosin acids, maleated, calcium salts is determined to be >100 mg/L.
The EC50 for rosin maleated is determined to be 16 - 22 mg/L.
The EC50 for resin acids and rosin acids, maleated, sodium salts is 17 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.

Acute Daphnia data are available for all category members, and the results are outlined below.

Rosin fumarated

Two studies are available for rosin, fumarated. Laus (2013) followed OECD guideline 202 and was GLP-compliant. Test concentrations were measured based on DOC, but results were reported based on nominal loading rates. The EL50 was determined to be >100 mg/L.

Inveresk Research (2002) is a GLP-compliant study following OECD guideline 202. Test solutions were prepared as WAFs and there was no analytical verification of the test concentrations. The EL50 was determined to be >100 mg/L.

A reliable study is also available for rosin, fumarated, reaction products with formaldehyde (Harlan Laboratories, 2010). Although the substance is not being registered under REACH it falls within the category definition and the result is read across to rosin, fumarated. In an OECD guideline 202 study, the EL50 was determined to be >100 mg/L.

Rosin maleated

 

Two reliable studies are available for rosin, maleated. WAFs were used and analytical monitoring of test concentrations was carried out in both studies. An EL50 of 22 mg/L was determined in one study (Harlan Laboratories, 2011) and an EC50 of 16 mg/L was determined in the second study (Laus, 2013).

Resin acids and rosin acids, maleated sodium salts

A GLP-compliant study following OECD guideline 202 is available for resin acids and rosin acids, maleated, sodium salts (Laus, 2013). The study utilised WAF techniques. The EC50 for resin acids and rosin acids, maleated, sodium salts was determined to be 17 mg/L, based on geometric mean measured test concentrations.

Resin acids and rosin acids, maleated calcium salts

A GLP-compliant study following OECD guideline 202 is available for resin acids and rosin acids, maleated, calcium salts (Laus, 2013). Test solutions were prepared as WAFs and as analysis showed measured concentrations based on DOC to be in the same range as the controls the results were based on nominal loadings. The EL50 for resin acids and rosin acids, maleated, calcium salts was determined to be >100 mg/L.