LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
structures had occurred. This indicates that iso-branched material of LAS is
amenable to biodegradation as well as the linear components.
Reference: Cavalli, L., Cassani, G., Lazzarin, M., Maraschin, C., Nucci, G. and Valtorta,
L. 1996b. Iso-branching of linear alkylbenzene sulphonate (LAS). Tenside
Surf. Det. 33:393-398.
Reliability: 2 Valid with restrictions
(e)
Type: aerobic [X]; anaerobic [ ]
Inoculum: adapted [ ]; non-adapted [X]; activated sludge, domestic
Concentration: 10.8 mg/L related to COD [ ]; DOC [X] test substance [ ]
Medium: water [X]; water-sediment [ ]; soil [ ]; sewage treatment [ ]
Degradation: 93% after 28 days
Results: readily biodeg. [X]; inherently biodeg. [ ]; under test condition no
biodegradation observed [ ], other [ ]
Kinetic: 7 day = 59%
Method:
14 day = 73%
21 day = 82%
Directive 79/831/EEC, Appendix V, C.4-A 1990. DOC Die-Away Test.
(OECD 301A Test). Samples were collected from an activated sludge basin
with predominantly local municipal waste water. The final sludge
concentration was 19.3 mg/L. Two replicates were used for the LAS test
concentration (9.44 mg/L) with inoculum, one with inoculum without LAS,
and two control replicates (sodium benzoate, 10.13 mg/L) with inoculum. A
total of 900 mLs of the solutions were put into 2000 mL Erlenmeyer flasks at
the beginning of the test. The loosely covered flasks were incubated at 21.5
to 22.6°C in the dark on a mechanical shaker for 28 days. Samples were
collected on days 0, 7, 14, 21 and 28 for DOC analysis.
GLP: Yes [X] No [ ] ? [ ]
Test substance: Marlon A 390 (CAS #68411-30-3) C10-13 LAS; average alkyl chain length =
C11.6
Remarks: LAS is readily biodegradable. The 10-day window criterion was fulfilled.
The control substance (sodium benzoate) showed 99% degradation after 28
days. This is a key study for ready biodegradability (see SIAR Table 4).
Reference: Schoeberl, P. 1993b. Bestimmung der biologischen Abbaubarkeit von
Marlon A 390 im DOC-DIE AWAY Test. Huels Final Report No. DDA-21.
Reliability: 1 Valid without restriction
(f)
Type: aerobic [X]; anaerobic [ ]
Inoculum: adapted [ ]; non-adapted [X ]; activated sludge
Concentration: 9.7 mg/L related to COD [ ]; DOC [ X ] test substance [ ]
Medium: water [X]; water-sediment [ ]; soil [ ]; sewage treatment [ ]
Degradation: 94% after 28 days
Results: readily biodeg. [X]; inherently biodeg. [ ]; under test condition no
biodegradation observed [ ], other [ ]
Kinetic: 3 day = 38%
7 day = 81%
14 day = 88%
21 day = 94%
Method: Directive 79/831/EEC, Appendix V, C.4-A - Year: 1990. DOC Die-Away
Test. (OECD 301A Test). Samples were collected from an activated sludge
basin with predominantly local municipal waste water. The final sludge
concentration was 18.1 mg/L. Two replicates were used for the LAS test
concentration (8.96 mg/L) with inoculum, one with inoculum without LAS,
and two control replicates (sodium benzoate, 11.65 mg/L) with inoculum. A
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