LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
GLP:
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 21.8
to 22.2°C in the dark on a mechanical shaker for 28 days. Samples were
collected on days 0, 3, 7, 14, 21, 27 and 28 for DOC analysis.
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 96% degradation after 28
days. This is a key study for ready biodegradability (see SIAR Table 4).
Reference: Schoeberl, P. 1993c. Bestimmung der biologischen Abbaubarkeit von
Marlon A 390 im DOC-DIE AWAY Test. Huels Report No. DDA-32.
Reliability: 1 Valid without restriction
(g)
Type: aerobic [X]; anaerobic [ ]
Inoculum: adapted [ ]; non-adapted [X]; municipal sewage treatment plant effluent.
Concentration: 5 mg/L related to COD [ ]; DOC [X] test substance [ ]
Medium: water [X]; water-sediment [ ]; soil [ ]; sewage treatment [ ]
Degradation: 76% after 28 day
Results: readily biodeg. [X]; inherently biodeg. [ ]; under test condition no
biodegradation observed [ ], other [ ]
Method: Directive 84/449/EEC, C.3 Modified OECD screening test. (OECD 301E
Test).
GLP: Yes [ ] No [X] ? [ ]
Test substance: Marlon A 350 (CAS #68411-30-3) C10-13 LAS, average alkyl chain length =
C11.6
Reference: European Commission. 2000b. Benzenesulfonic acid, C10-13-alkyl derivs.,
sodium salts. Year 2000 CD-ROM edition, citing Henkel KGaA,
unpublished results (Registry No. 5929).
Reliability: 4 Not assignable
(h)
Type: aerobic [X]; anaerobic [ ]
Inoculum: adapted [ ]; non-adapted [X]; activated sludge
Concentration: 10 mg/L related to COD [ ]; DOC [X]; test substance [ ]
Medium: water [X]; water-sediment [ ]; soil [ ]; sewage treatment [ ]
Degradation: 91.6% based on DOC reduction
Results: readily biodeg. [ ]; inherently biodeg. [ ]; under test condition no
biodegradation observed [ ], other [X]
Method: OECD Guideline 303 A “Simulation Test - Aerobic Sewage Treatment:
Coupled Unit Test” 1981. The studies were carried out in the OECD
Confirmatory Test plant at different laboratories using synthetic wastewater
as specified in the EC Guidelines 82/242 and 82/243. The amount of
surfactant supplied was 10 mg/ of MBAS/L. The amount of MBAS in the
wastewater feed corresponds approximately to that detected in the feed of
municipal sewage plants, which corresponds to about 6 mg DOC/L. Test
periods in the different laboratories ran from 33 to 139 days.
GLP: Yes [ ] No [X] ? [ ]
Test substance: C10-13 LAS, sodium salt (CAS #68411-30-3); average alkyl chain length =
C11.6
Remarks: The degradation rate of 91.6% is the mean of 10 studies conducted at 7
different laboratories, based on DOC reduction. Since numerous studies
have shown that not only anionic surfactants are shown in the MBAS
analysis, the degradation plant discharge was analyzed on days 22, 24, 29 and
30 using HPLC analysis. Results showed that the content of intact LAS was
UNEP PUBLICATIONS 159