Registration Dossier
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EC number: 701-236-3 | CAS number: -
Short-term toxicity to aquatic invertebrates
Administrative data
Link to relevant study record(s)
Description of key information
No ecotoxicity studies are available for Distilled tall oil, magnesium salt. However, a number of studies are available that can be read across from to provide information on the rosin and fatty acid components of the substance.
There are a wide range of ecotoxicity results reported that can be read across from the rosin component of Fatty acids, tall oil, magnesium salts. The most conservative EC50 value is 1.6 mg/L. An EL50 of 16 mg/L is read across from the fatty acid component of the substance. For classification purposes the worst case value of 1.6 mg/L is used.
Key value for chemical safety assessment
Additional information
A number of reliable studies are available that can be read across from the rosin and the fatty acid components of Distilled tall oil, magnesium salt.
A number of studies are available for rosin, hydrogenated rosin and rosin salts. These are read across to the rosin component of Distilled tall oil, magnesium salt. One reliable study is available for Resin acids and rosin acids, calcium zinc salts using Daphnia magna (Harlan 2010). 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 2010).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 (2003) 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 1998). 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 (1998) 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 2005). The study determined a 48 -hour EC50 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 1993). 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 GLP compliant, guideline study is available to assess the acute toxicity of Fatty acids C18 (unsaturated) lithium salts to Daphnia magna (Harlan, 2010).This result is read across to the fatty acid component of Distilled tall oil, magnesium salt. Following preliminary range-finding tests and an initial experiment, twenty daphnids (2 replicates of 10 animals) were exposed to Water Accommodated Fractions (WAFs) of the test item over a range of nominal loading rates of 1.0, 1.8, 3.2, 5.6, 10, 18, 32, 56 and 100 mg/l for 48 hours at 20°C under static test conditions.Analytical verification of test concentrations was conducted.The number of immobilised Daphnia was recorded after 24 and 48 hours.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 48-Hour EL50 for the test item to Daphnia magna based on nominal loading rates was 16 mg/l WAF with 95% confidence limits of 14 - 19 mg/l WAF.
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