LINEAR ALKYLBENZENE SULFONATE (LAS) - UNEP Chemicals

OECD SIDS LINEAR ALKYLBENZENE SULFONATE (LAS)
Test substance: LAS; C 14 -LAS chain length C12 (91% purity) plus unlabeled LAS with
average chain length C11.6 (C10 9.7%, C11 27.9%, C12 54.4%, C13 8.0%; 95%
purity) (tested together)
Remarks: Dissolved oxygen concentrations ranged between 7.0 and 9.0 mg/L.
Temperature was maintained at 2°C and the mean pH was 8.1 ± 0.2.
Bluegill fish growth was reduced at the 2.0 and 4.0 mg/L concentrations but
not at 0.5 or 1.0 mg/L. Results for the other species and community
parameters tested are summarized in Section 4.7 (i). Juvenile growth was the
most sensitive fish endpoint in this model ecosystem study and thus is
appropriate to use for chronic toxicity. This is a key study for chronic aquatic
toxicity to fish (see SIAR Table 12).
Reference: Maki, A.W. 1981. A Laboratory model ecosystem approach to
environmental fate and effects studies. Unpublished Internal Report,
Environmental Safety Department Procter and Gamble Company, Cincinnati,
Ohio.
Reliability: 2 Valid with restrictions
4.5.2 CHRONIC TOXICITY TO AQUATIC INVERTEBRATES
Water-only Exposures
(a)
Type of test: static [ ]; semi-static [ ]; flow-through [ ]; open-system [ ]; closed-system [ ];
not stated [X]
Species: Ceriodaphnia sp. (Crustacea)
Endpoint: Mortality [ ]; Reproduction [X]
Exposure period: not stated
Results: NOEC = 3 mg/L
Analytical monitoring: Yes [ ] No [ ] ? [X]
Method: Standard laboratory methods.
GLP: Yes [ ] No [] ? [X]
Test substance: C11.7 LAS
Remarks: Further information regarding study conditions was not provided in this peerreviewed
publication.
Reference: Kimerle, R.A. 1989. Aquatic and terrestrial ecotoxicology of linear
alkylbenzene sulfonate. Tenside Surfactants Detergents, 26:169-176.
Reliability: 4 Not assignable. Data table cites an unpublished report by Procter &
Gamble.
(b)
Type of test: static [ ]; semi-static [X]; flow-through [ ]; open-system [ ]; closed-system
[X]; not stated [ ]
Species: Ceriodaphnia sp. (Crustacea)
Endpoint: Mortality [X]; Reproduction [X]
Exposure period: 7 day
Results: NOEC = 0.7 mg/L (geometric mean of two tests); 0.84 mg/L (normalized for
C11.8 LAS)
NOEC = 0.5 mg/L (trout chow/algae diet)
EC10 = 0.99 mg/L (yeast diet); normalized EC10 = 1.18 mg/L
Analytical monitoring: Yes [ ] No [X] ? [ ]
Method: ASTM (Commotto 1982; Mount and Norberg 1983). Ceriodaphnia were
cultured individually in 50 mL beakers containing 30 mL culture water.
Two tests were conducted, representing animals fed with two different diets
(troutchow and algae – Selenastrum capricornutum – or baker’s yeast).
They were acclimated to the test conditions and diet for two generations
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