LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
LAS C10 LAS C11
Pure Homologues (%)
LAS C12 LAS C13 LAS C14
C14 -- -- -- -- 0.9
LAS MW
(as Na-LAS)
320.7 333.7 346.4 362.3 373.7
Remarks: The purpose of the study was to determine the toxicity of five pure
homologues of LAS to the activated sludge of a treatment plant basically
operating on domestic sewage. A contact time of 3 hours instead of 15
minutes was chosen to better simulate the real residence time used in
wastewater treatment plants (4-6 hours). The EC50 values are far above
environmental concentrations and therefore provide a high margin of safety.
The 3-hour EC50 range for the reference substance (3,5-dichlorophenol)
ranged from 20-30 mg/L, within the valid range of 5-30 mg/L.
Reference: Verge C. and Moreno, A. 1996b. Toxicity of anionic surfactants to the
bacterial population of a waste water treatment plant. Tenside Surf. Det.
33:323-327.
Reliability: 2 Valid with restrictions
(c)
Type: Aquatic [X]; Field [ ]; Soil [ ]; Other [ ]
Species: activated sludge
Exposure Period: 15 minute
Results: EC50 = 107-152 mg/L
Analytical monitoring: Yes [ ] No [X] ? [ ]
Method: ESD-VIII-D-1, Issue II (9/8/80)
GLP: Yes [ ] No [X] ? [ ]
Test substance: C10-13 LAS (CAS #68411-30-3)
Remarks: Information as cited in IUCLID Data Sheet for CAS #68411-30-3. Huels
AG judged study quality to be good. Effect: inhibition of respiration.
Nominal concentrations (expected deviation