Chronic toxicity C12LAS

No studies on the acute toxicity of C12LAS to algae and aquatic plants were found in the literature. Typical toxicity-testing protocols use a test duration of 4-7 days. This duration of testing represents a significant portion of the organisms life span for the taxa tested. Thus these toxicity tests are appropriately considered chronic-toxicity tests. 

The chronic toxicity of C12LAS to invertebrates, fish, and algae span a relatively narrow toxicity range (Table III). Toxicity to fish and one algal species is comparable and slightly greater than toxicity to invertebrates. 

Table III. Chronic Toxicity of C12LAS to Invertebrates, Fish, and Algae...

For the effect level, application of the invertebrate acute-to-chronic ratio to the most acutely sensitive invertebrate species, Dero, generates a chronic toxicity value of 0.6 mg/L. This value compares favorably with the measured NOECs of 1.2 and 1.4 mg/L, respectively, for the invertebrates Daphnia magna and Ceriodaphnia dubia. The fish species most sensitive to C12LAS chronic toxicity is the fathead minnow, Pimephales promelas. Most recently, Fairchild et al. (64) reported a chronic C12LAS NOEC of 0.7 mg/L for the fathead minnow. This NOEC compares favorably with the NOEC of 1.1 mg/L reported by Holman and Macek (66) for the same species. 

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See also in sourсe #XX -- [ , ]

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