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Ecotoxicological information

Short-term toxicity to aquatic invertebrates

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Description of key information

A daphnia rangefinding test has been performed to evaluate which of two very similar alkylnaphthalene sulphonates is the more toxic substance. The results obtained indicate that there is a slightly higher toxicity observed for the high nonene derivative (test substance 2) when compared to the low nonene derivative. 

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The definitive long-term daphnia test has been performed with the high nonene naphthalene sulphonate (batch no S001218) because algae and acute daphnia range finding tests with both the low nonene (batch no S001235) and high nonene substance indicated a slightly higher toxicity for the high nonene naphthalene sulphonate.

As the results of both range finding tests are considered to be valid and because both test substances are very similar in their fate during these tests, the conclusion that the high nonene derivative is slightly more toxic than the low nonene derivative is considered sufficient to select the more toxic derivative as the worst-case representative in the hazard assessment of both substances. For this reason read-across of ecotoxicity results of the source chemical (the high nonene derivative) to the target chemical (the low nonene derivative) is considered to be justified without the introduction of an additional safety factor.