Registration Dossier
Registration Dossier
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EC number: 307-055-2 | CAS number: 97489-15-1
Endpoint summary
Administrative data
Description of key information
Additional information
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.
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