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Ecotoxicological information

Toxicity to soil macroorganisms except arthropods

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Description of key information

Results from a 14-day earthworm study (OECD 207 TG) (limit test) show that  mono-, and di-(sec-hexadecyl)naphthalene did not cause any toxicity at the highest soil concentrations tested (i.e., 936 mg/kg soil dw, measured) (ExxonMobil Biomedical Sciences Laboratory, 2009b).  The 14-day LC50 was greater than 936 mg/kg soil dw and the 14-day NOEC was greater than 936 mg/kg soil dw with no mortality observed.  Overall, these findings indicate that the study substance was not toxic and produced no mortality or adverse effects in earthworms exposed to soil concentrations as high as 936 mg/kg dw
Key values for toxicity to soil macroorganisms for CSA are:
14-day LC50 > 936 mg/kg soil dw   mortality  - Earthworm short-term toxicity (OECD 207 TG)
14-day NOEC > 936 mg/kg soil dw  mortality - Earthworm short-term toxicity (OECD 207 TG)

Key value for chemical safety assessment

Additional information

The short-term soil macroorganism toxicity testing has been carried out with the study substance. Results from a 14-day earthworm study (OECD 207 study guidelines) show that study substance does not cause any toxicity at the highest soil concentrations tested (1000 mg/kg nominal, measured 936 mg/kg average soil dw) (ExxonMobil Biomedical Sciences Laboratory, 2009). The 14-day LC50 was greater than 936 mg/kg soil dw and the 14-day NOEC was greater than 936 mg/kg soil dw with no mortality observed. Given the short term toxicity data that the study substance is not likely to pose acute toxicity to soil macroorganisms like the earthworm (14-day NOEC > 936 mg/kg and LC50> 936 mg/kg) and given the lack of acute and chronic adverse data effects in aquatic organisms, it is not expected that the study substance is likely to pose a chronic adverse effects to soil macroorganisms. In addition, the study substance is extensively biodegradable (>60%) in the aquatic environment and is expected to be rapidly biodegraded in the soil compartment, is not persistent and is not bioaccumulative.