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Ecotoxicological information

Toxicity to aquatic algae and cyanobacteria

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Description of key information

The EC50 for members of the category Rosin, hydrogenated rosin and their salts is determined to be 39.6 mg/L based on growth rate and 16.6 mg/L based on biomass.

Key value for chemical safety assessment

Additional information

There are studies available for a number of the members of this category.

Reliable studies are available for rosin. Inveresk (2001c) determined toxicity to Selenastrum capricornutum using WAFs. No analytical verification of test concentrations was conducted. The study determined an EL50 of >1000 mg/L, Another study (Akzo Nobel, 1998d) is also available using Selenastrum capricornutum which also uses WAFs but did not carry out any analytical verification. An EL50 of >100 mg/L was determined in this study.

A study with Tall oil rosin, which is considered to be equivalent to rosin, is also available (Akzo Nobel, 1998d). The study used WAFs with no analysis of test concentrations. No toxicity was observed at a concentration of 100 mg/L.

A study was conducted with Resin acids and Rosin acids, hydrogenated, potassium salts (Eastman, 2005c), which did not analyse for test concentrations. An EC50 of 39.6 mg/L was determined based on growth and 16.6 mg/L based on biomass.

A reliable study is available for Rosin, reaction products with formaldehyde (Harlan Laboratories, 2010i). The study followed OECD guideline 201. The test substance is a UVCB with low water solubility and the study was conducted using Water Accommodated Fraction at a single loading rate of 100 mg/L. No mortality was observed throughout the study in the control or at any of the loading rate WAF. The 48 hour NOELR was determined to be 100 mg/L and the 48 hour EL50 was > 100 mg/L.