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

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.18 µg/L

Assessment factor:

1 000

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

1.8 µg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.018 µg/L

Assessment factor:

10 000

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

10 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

3.13 mg/kg sediment dw

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

313 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:

626 µg/kg soil dw

Extrapolation method:

equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

PNEC oral

PNEC value:

5.5 mg/kg food

Assessment factor:

200

Additional information

Three short-term toxicity data for aquatic endpoints are available and the lowest value is > 0.18 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 0.00018 mg/L (0.18 µg/L). For lacking the toxicity data for marine water organisms and AF of 10000 is applied to derive PNECsaltwater. Thus, the PNECsaltwater is 0.000018 mg/L (0.018 µg/L). AF of 100 is applied to derive PNECaqua (intermittent releases), thus PNECaqua (intermittent release) is 1.8 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 3.13, 0.313 and 0.626 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 (NOAEL 55 mg/kg bw), CONVrat of 20 kg bw*d/kg food is applied for and AF oral of 200 is applied. Thus, PNECoral is 5.5 mg/kg food.

For the VP of the substance is very low (0.000000000006 Pa at 20 degree C), thus the very limited hazard for air is expected.

Partly read-across from a close structural analogue DNNSA(di C8-C10, branched, C9 rich, alkylnaphthalene sulphonic acid) was applied and the validity of this approach was confirmed by an acute daphnia toxicity test with the test substance also not showing toxicity within the limits of water solubility in the test medium. This daphnia study is chosen as starting point for PNEC calculations.

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 3.16 and thus that the substance is hardly bioaccumulating and two magnitudes lower than the classification threshold. Thus, the substance is also not classifiable for chronic aquatic toxicity according to CLP or DSD.