Hexadecylnaphthalene

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.1 mg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

1 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.01 mg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

100 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

4 300.36 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

430 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Hazard for air

Air

Hazard assessment conclusion:

no hazard identified

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

857.5 mg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Study reports on the analogue alkylated naphthalene have been available for acute tests with fish, invertebrates and algae. The results are summarized as below:

The fish acute toxicity test was performed according to OECD guideline No. 203 under GLP compliance. The result showed the test substance induced no visible or lethal effects in carp at 0.020 mg/l, being the average measured exposure concentration in a WAF prepared at a loading rate of 100 mg/l (NOEC). The 96 h-LC50 exceeded 0.020 mg/l, being the average measured exposure concentration in a WAF prepared at a loading rate of 100 mg/l.

The acute toxicity test with Daphnia magna was performed according to OECD guideline No. 202 under GLP compliance. The result showed the test substance did not induce acute immobilisation of Daphnia magna at 0.62 mg/l, being the average measured concentration in a WAF prepared at a loading rate of 100 mg/l after 48 hours of exposure (NOEC). The 48 h-EC50 exceeded 0.62 mg/l, being the average measured concentration in a WAF prepared at a loading rate of 100 mg/l.

Algal growth inhibition test was performed according to OECD guideline No. 201 under GLP compliance. The result showed no reduction of growth rate or inhibition of yield was recorded at any of the WAFs of Alkylated Naphthalene tested. Both the EC50 for growth rate reduction (72 h-ErC50) and the EC50 for yield inhibition (72 h-EyC50) exceeded 0.2 mg/l, being the Time Weight Average concentration in a WAF prepared at a loading rate of 100 mg/l.

Due to the poor water solubility of the substance (below 10 μg/L), the exposure to the aquatic compartment is negligible. In addition, it is sufficient for the classification and PBT/vPvB assessment based on available information.

Based on the acute toxicity tests results of three trophic levels (fish, Daphnia and algae) with the analogue, the short-term LL/EL50 values are all above 100 mg/l, thus the loading rate of 100 mg/l is used as the key value for PNECwater calculation.

Due to lack of aquatic toxicity no hazard for the aquatic compartment is expected but nevertheless a PNEC was derived as input for sediment and soil PNEC calculation based on the partitioning method.

As no bioaccumulation is expected through the food chain, no PNEC for secondary poisoning was derived.

Conclusion on classification

The substance is not classified according to the criteria given in Regulation (EC) No 1272/2008.