Registration Dossier

Administrative data

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:
no hazard identified

Marine water

Hazard assessment conclusion:
no hazard identified

STP

Hazard assessment conclusion:
no data: aquatic toxicity unlikely

Sediment (freshwater)

Hazard assessment conclusion:
no hazard identified

Sediment (marine water)

Hazard assessment conclusion:
no hazard identified

Hazard for air

Air

Hazard assessment conclusion:
no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:
no hazard identified

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
no potential to cause toxic effects if accumulated (in higher organisms) via the food chain

Additional information

The study substance, mono-, and di-(sec-hexadecyl)naphthalene, does not produce acute or chronic toxicity in freshwater aquatic organisms (e.g., fish, invertebrates and algae). The absence of toxicity demonstrated by mono-, and di-(sec-hexadecyl)naphthalene is due in part to low water solubility, resulting in low exposure potential in the aqueous compartment as well as the ability of organisms to metabolize the study substance at a rate which prevents a critical body burden from being reached. The data show that the study substance is not toxic at its maximum water solubility limit [expected in the water accommodated fractions (WAF), water soluble fractions (WSF) or oil-in-water dispersions (OWD)] under the conditions of the tests. Since study substance does not cause acute or chronic toxic effects at the limits of water solubility, it was not possible to derive NOEC or PNEC values needed for quantitative risk assessment. However, it was possible to qualitatively conclude that based on low water solubility and the observed lack of acute and chronic aquatic toxicity, that the study substance (i.e., mono-, and di-(sec-hexadecyl)naphthalene) does not pose an unacceptable risk to the aquatic compartment. 


Note: Owing to its inherently very low water solubility and analytical difficulties in trying to determine the measured concentrations of the study substance in water samples, the reported NOEL, EL50 or LL50 limit values (nominal concentrations) used in support of hazard classification are not true measured NOEC and therefore, may not be applicable for quantitative use in risk assessment.

Conclusion on classification

The environmental fate (Section 5) and aquatic toxicity (Section 6) data presented in the IUCLID dossier support the conclusion that study substance is not classified for the environment. No environmental classification or labelling is warranted. This is based on current findings demonstrating that the study substance is extensively and rapidly biodegraded in the aqueous environment, shows no chronic or acute toxicity to aquatic organisms, and is not bioaccumulative or persistent, according to the criteria identified in 67/548/EEC.