Naphthalenesulfonic acid, di-C9-rich C8-10-branched alkyl derivs.

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.27 µg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

2.7 µg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.027 µg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

10 000 µg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

4.18 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

418 µg/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:

834 µg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

PNEC oral

PNEC value:

9.5 mg/kg food

Assessment factor:

200

Additional information

Three short-term toxicity data for aquatic endpoints are available and the lowest value is 0.27 mg/L (highest achievable concentration but EC50 not reached), which was the EC50 of the test substance to daphnia. AF (Assessment factor) of 1000 is applied to derive the PNECwater. Thus, PNECwater is 0.00027 mg/L (0.27 µg/L). For lacking the toxicity data for marine water organisms and AF of 10000 is applied to derive PNECsaltwater. Thus, the PNECsaltwater is 0.000027 mg/L (0.027 µg/L). AF of 100 is applied to derive PNECaqua (intermittent releases), thus PNECaqua (intermittent release) is 2.7 µg/L.

The NOECmicro-organism was 100 mg/L based on the active sludge respiration inhibition test. AF of 10 is applied. Thus, the PNECstp is 10 mg/L.

As no sediment dwelling organisms and terrestrial organisms is available, EPM is applied to derive PNECsed, PNECmarine-sed and PNECsoil. Based on the available Koc, water solubility, molecular weight and vapor pressure, the PNECsed, PNECmarine-sed and PNECsoil are 4.18, 0.418 and 0.834 mg/kg dw respectively according to guidance on information requirements and chemical safety assessment chapter R.10.: characterisation of dose[concentration]-response for environment.

PNEC oral is derived based on the available 50 days repeated dose toxicity data, CONVrat of 20 kg bw*d/kg food is applied for and AF oral of 200 is applied. Thus, PNECoral is 9.5 mg/kg food.

For the VP of the substance is very low (0.000033 Pa at 20 degree C), thus the very limited hazard for air is expected.

Conclusion on classification

In none of the acute aquatic toxicity tests performed on fish, daphnia and algae, an LC50 or EC50 could be achieved within limits of solubility. Thus, the L(E)C50 on all three trophic levels is considered above water solubility and no classification for acute aquatic toxicity is derived according to CLP (Regulation EC No 1272/2008) or DSD (Directive 67/548/EEC). Although the log of n-octanol/water partitioning coefficient was > 6.6 a valid BCF QSAR showed that the BCF is expected in the range of 56.2 and thus that the substance is hardly bioaccumulating and a magnitude lower than the classification threshold. Thus, the substance is also not classifiable for chronic aquatic toxicity according to CLP or DSD.