Benzenesulfonic acid, C10-13-alkyl derivs., calcium salt

Ecotoxicological Summary

Hazard for aquatic organisms

Freshwater

Hazard assessment conclusion:

PNEC aqua (freshwater)

PNEC value:

0.023 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

PNEC freshwater (intermittent releases):

0.01 mg/L

Marine water

Hazard assessment conclusion:

PNEC aqua (marine water)

PNEC value:

0.002 mg/L

Assessment factor:

100

Extrapolation method:

assessment factor

STP

Hazard assessment conclusion:

PNEC STP

PNEC value:

3 mg/L

Assessment factor:

10

Extrapolation method:

assessment factor

Sediment (freshwater)

Hazard assessment conclusion:

PNEC sediment (freshwater)

PNEC value:

0.174 mg/kg sediment dw

Assessment factor:

1

Extrapolation method:

equilibrium partitioning method

Sediment (marine water)

Hazard assessment conclusion:

PNEC sediment (marine water)

PNEC value:

0.017 mg/kg sediment dw

Assessment factor:

10

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:

0.62 mg/kg soil dw

Assessment factor:

10

Extrapolation method:

assessment factor

Hazard for predators

Secondary poisoning

Hazard assessment conclusion:

no potential for bioaccumulation

Additional information

Note that the endpoint records reflect data from CaDDBS and, in some cases, from the analogue sodium salt of linear alkylbenzene sulfonate (commonly known as LAS). LAS is the sodium salt of linear alkylbenzene sulfonic acid with alkyl carbon chain lengths ranging from C₁₀to C₁₃and averaging 11.6. The primary structure is a C₁₀to C₁₃linear alkyl chain with apara-substituted benzene sulfonic acid sodium salt group attached at any of the secondary alkyl carbon positions. CaDDBS is the calcium salt of linear alkylbenzene sulfonic acid with alkyl chain lengths ranging from C₁₀to C₁₄.The primary difference between the two moieties is the salt – either sodium or calcium. Given their structural and functional similarities, the LAS material is a good analogue for read-across for instances where data are available on it but not on CaDDBS. In both cases the alkyl chain length varies and so specific LAS and CaDDBS may be used in some of the testing for which data are provided in this section. When available the specific LAS or CaDDBS is identified in the endpoint record and the tables in this chemical safety report. For ease of reading, the general terms LAS and CaDDBS are used in the text.

Conclusion on classification

No toxicity data are available for sediment organisms so the equilibrium partitioning method was used to determine the PNEC_sediment. The calculation utilized Equation R.10-2 from Guidance Part R.10 (p.33), which calculates PNEC_sedimentfrom the partition coefficient for suspended matter/water, the bulk density of wet suspended matter, and the PNEC_wateras calculated for freshwater and shown in Table 24 above. The default bulk density for suspended matter of 1150 kg/m3 was used. The partition coefficient was calculated using Equation R.16-6 from Guidance Part 16.5.3.3 (p. 31). For inputs to that equation, the default F_ocvalue as shown in Table R.16-9 (p. 48) was used, and the highest K_ocvalue calculated for the constituents as described in Section 4.1.5 of the CSR was used.

Based on the aquatic data available, linear CaDDBS is not classified.