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Short-term toxicity to aquatic invertebrates

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Description of key information

There is a wide range in acute toxicity results reported. However, the most conservative results for members of the category Rosin, hydrogenated rosin and their salts is an EL50 of >10 mg/L <100 mg/L and an LC50 of 1.6 mg/L.

Key value for chemical safety assessment

Additional information

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

One reliable study is available for Resin acids and rosin acids, calcium zinc salts using Daphnia magna (Harlan Laboratories, 2010f). The study followed a standard guideline, adapted for a poorly soluble substance so that WAFs were used. Analytical verification of test concentrations was conducted. The study determined an EL50 value of >100 mg/L (nominal).

A reliable study is available for Resin acids and rosin acids, magnesium salts, again using Daphnia magna and utilizing WAF techniques (Harlan Laboratories, 2010g). Analytical verification of test concentrations was conducted. The dissolved test item may have been one or several components of the test item. Given that toxicity cannot be attributed to a single component or mixture of components but to the test item as a whole, the results were based on nominal loading rates only. The study determined an EL50 value of 36 mg/L.

Two reliable studies are available for rosin. Inveresk (2001b) utilized WAF techniques, but there was no analytical verification of the test concentrations. An EL50 of 911 mg/L was determined from this study. Another study is also available (Akzo Nobel, 1998b). This study used WAFs, with no analytical verification of test concentrations. The test showed 100% mortality at a loading rate of 100 mg/L and no mortality at a loading rate of 10 mg/L.

Akzo Nobel (1998c) determined the toxicity of Tall oil rosin, which is considered to be equivalent to rosin, using WAF techniques. No analysis of test concentrations was conducted. At a nominal concentration of 10 mg/L mortality was no higher than in the control, at a concentration of 100 mg/L there was 100% mortality.

A study using Resin acids and rosin acids, hydrogenated, potassium salts followed a standard guideline but used nominal concentrations only (Eastman, 2005b). The study determined a 48 -hour LC50 of 1.6 mg/L.

A study with zinc resinate used WAFs due to the low water solubility of the test substance (Water Quality Institute, 1993e). There was no analytical verification of test concentrations. As the WAFs were prepared by dilution from a concentration of 2000 mg/L, only the 2000 mg/L concentration is considered valid. The 48 -hour EL50 was determined to be >2000 mg/L.

A reliable study is available for Rosin, reaction products with formaldehyde (Harlan Laboratories, 2010h). The study followed OECD guideline 202. The test substance is a UVCB with low water solubility and the study was conducted using Water Accommodated Fraction at loading rates of 10, 18, 32, 56 and 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.