Reaction product of Benzenesulfonic acid, 4-C10-13-sec-alkyl derivs. and Benzenesulfonic acid, 4-methyl- and sodium hydroxide

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.268 mg/L

Assessment factor:

1

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.055 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.027 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

5.6 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

8.1 mg/kg sediment dw

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

8.1 mg/kg sediment dw

Assessment factor:

10

Extrapolation method:

assessment factor

Hazard for terrestrial organisms

Soil

Hazard assessment conclusion:

PNEC soil

PNEC value:

35 mg/kg soil dw

Extrapolation method:

sensitivity distribution

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Cited References

Comber, SDW et al, 2002. Chronic toxicity of sediment associated linear alkylbenzene sulphonates (LAS) to freshwater benthic organisms. Environmental Pollution 144:661-668.

Diefenbach, R. 1998. Marlon ARL, Bestimmungder akuten Toxizitat gegenuber Fishen. Huels AG, FK 1399 (1998-12-14).

Jensen, J et al, 2007. European risk assessment of LAS in agricultural soil revisited: species sensitivity distribution and risk estimates. Chemosphere 69: 880-892.

Schoberl, P. 1993. Bestimmung der Bakterientoxizitat von Marlon ARL im Pseudomonas-Zellvermehrung s-Hemmtest (DIN 38412 Teil 8), Huls AG, PZ-93/21 (1993-12-13).

Spilker, R. 2010. Property Measured/Assessed: 7.8 Partition coefficient n-octanol/water. Sasol 0648 08 00164 (2010-09-29).

Conclusion on classification

The lowest acute data point for Marlon ARL is a 96 hour LC₅₀of 5.5 mg/L for fish (Diefenbach 1998). However, Marlon ARL would not be classified regarding acute aquatic toxicity under the EU CLP Regulation as it is readily biodegradable and has a very low logPow of 0.7 (Spilker 2010) such that its estimated BCF would be far less than 500.

Five published long-term fish toxicity studies are published for the major read across substance that comprises the substance being registered. The NOEC and LOEC values for the read across substance linear alkylbenzenesulfonate (LAS) are: 0.63 and 1.2 mg/L for fathead minnows exposed for 196 days; 0.25 and 0.51 mg/L for talapia exposed for 90 days; 3.2 and 10 mg/L for guppies exposed for 28 days; 0.23 and 0.35 mg/L for trout exposed for 72 days; and 1.0 and 2.0 mg/L for bluegill exposed for 28 days.

There are 5 study reports of long-term toxicity to aquatic invertebrates for the substance that is the main consituent of the reaction product Marlon ARL. That read across substance is linear alkylbenzenesulfonate (LAS) and the data are: 21-day EC50 is 1.5 and NOEC is 1.18 mg/L for daphnids; 7-day LC50 is 5.34 and NOEC is 0.5 mg/L for ceriodaphnids; 28-day NOEC is 2.8 mg/L for midge; 2-day EC50 is 2.0 and EC10 is 1.18 mg/L for rotifer; and 32-day EC20 is 0.27 mg/L for clam, 24-day EC20 is 0.95 mg/L for amphipod, and 32-day EC20 is 2.9 mg/L for snail.

Based on the lowest NOEC of 0.23 mg/L in the chronic fish test of the component LAS the readily biodegradable substance is classified aquatic chronic 3 (H412) according to EU CLP regulation.