Registration Dossier

Administrative data

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:
0.1 mg/L
Assessment factor:
1 000
Extrapolation method:
assessment factor

STP

Hazard assessment conclusion:
PNEC STP
PNEC value:
1 000 mg/L
Assessment factor:
10
Extrapolation method:
assessment factor

Sediment (freshwater)

Hazard assessment conclusion:
PNEC sediment (freshwater)
PNEC value:
149 280 mg/kg sediment dw
Extrapolation method:
equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:
PNEC sediment (marine water)
PNEC value:
149 280 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:
29 768 mg/kg soil dw
Extrapolation method:
equilibrium partitioning method

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:
PNEC oral
PNEC value:
33 mg/kg food
Assessment factor:
300

Additional information

Derivation of PNECs

The PNECfreshwater, PNECmarine water, PNECintermittent release, PNEC STP and PNECoral were derived by application of an assessment factor. This procedure is described in detail in the ECHA REACH Guidance of May 2008, Chapter R.10 ("Characterisation of dose [concentration]-response for environment").

The PNECs for sediments (freshwater and marine water) and soil are derived using the Equilibrium Partitioning Method (EPM) which is in concordance with ECHA REACH Guidance R.10 (“Guidance of Information Requirements and Chemical Safety Assessment, Chapter R.10: Characterisation of dose-response for environment”). The required normalized organic-carbon soil coefficient (Koc) value for the sodium sulfonate (C20-24) was estimated by QSAR prediction (Chemservice S.A., 2015a). The applied Henry's Law Constant was calculated by QSAR using HENRYWIN v3.20 (Chemservice S.A., 2015b).

Furthermore, no PNEC for the atmospheric compartment (PNECair) has been calculated. It is considered as not relevant based on the chemical structure and intrinsic properties of Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts.

Conclusion on classification

Environmental classification and labelling

Valid experimental results are available for evaluating environmental fate and ecotoxicity. For the sodium sulfonate (Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts), data referring to the toxicity to aquatic algae is available.For the read-across substances, data referring to biodegradation as well as aquatic short-term toxicity towards fish, invertebrates and algae is available. Based on the structural similarity and substance characteristics of the target and the read-across substances, all results from the read-across substances can be equivalently used for the target substance. Physico-chemical, toxicological and ecotoxicological properties are likely to be similar. For a detailed justification and further information about this procedure, please refer to the separate read-across statement (Chemservice S.A., 2016).

The read-across substances showed only low biodegradation (Douglas, 1989; Sanitised, O., 1996; Sanitised, P., 1994) and were assessed to be not readily/rapidly biodegradable. This also applies for the sodium sulfonate (Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts).

Acute toxicity data for three trophic levels (i.e. fish, daphnids and algae) is also available for the read-across substances. For the target substance, data referring to the toxicity to aquatic algae is available. All obtained effect levels (EL50, LL50) were found to be > 100 mg/L. Based upon the obtained experimental results and in reference to the seventh Adaptation to Technical Progress (ATP) of Regulation (EC) No. 1272/2008, the sodium sulfonate (Benzenesulfonic acid, mono-C20-24 (even)-sec-alkyl derivs., para-, sodium salts) has not to be classified and labelled with respect to environmental hazards.