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Environmental fate & pathways

Endpoint summary

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In Table 4.xx Tests on Biodegradability of SAS are summarized.

Table 4.xx SAS Biodegradation Tests

Test type Basis Endpoint Value Exposure
time (d)
Year Remark
             
Ready OECD 301B CO2 evolution (%) 78 28 2001 Clariant, KEY
Ready OECD 301B CO2 evolution (%) 78 18 1990 Huels, KEY
Ready OECD 301D O2 consumpt. (%) 69 28 1991 Huels
Ready OECD 301E DOC removal (%) 89 28 1994 Clariant
Ready OECD 301E DOC removal (%) 95 28 1990 Huels
Inherent OECD 302B DOC removal (%) 89 28 1993 Clariant
Simulation
STP
OECD 303A DOC removal (%) 96.2 34 1991 Clariant, KEY
Simulation
STP
OECD 303A DOC removal (%) 98.6 25 1992 Clariant
Simulation
STP
OECD 303A DOC removal (%) 90.6 28 1990 Huels
Simulation
STP
OECD 303A DOC removal (%) 99 29 1990 Huels
Simulation
STP
OECD 303A DOC removal (%) 96.1 74d 1991 Huels, Catabolism test
             
Env.monitoring STP Monitoring Removal (%)
in effluent
99.4 n.a. 1994 Field et al, average from
9 data sets (see IUC 5.5)
             
Simulation
Soil
OECD 307 DT50 (d) 7 n.a. 1997 Kuechler et al
Simulation
Sediment
OECD 308 DT50 (d) 7 n.a. 1997 Kuechler et al
Simulation
Surface water
OECD 309 DT50 (d) 0.5 n.a. 1995 HERA LAS, 2004

The results of the CO2 Evolution tests OECD301B prove primary and ultimate biodegradation of SAS. Ready biodegradability of SAS is also confirmed by OECD 301D and 301E Tests. Inherent biodegradability was demonstrated by a Zahn-Wellens Test OECD 302B. The OECD 303A Sewage Treatment Plant Simulation Tests show high elimination rates in the effluent of the test system. As only DOC removal was measured, sewage sludge concentration are not available (would require substance specific analysis).

The results from an Environmental monitoring study of 9 different STPs show high removal of SAS in the effluent (average 99.4%). 99% removal of SAS in STP is used for the Environmental exposure assessment.

Simulation test results for soil, sediment and surface water for SAS are not available. Instead the data from a similar anionic surfactant LAS (HERA LAS, Version 2, 2004, AISE) were used for the Environmental exposure assessment of SAS. This read-across is justified as from available degradation data it was shown that the degradation rate for SAS was always higher than for LAS. The DT50 from the LAS Simulation tests in surface water, sediment and soil are low which confirms rapid biodegradation also in other environmental compartments.