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EC number: 270-115-0
CAS number: 68411-30-3
In a 96 h acute toxicity study, Bluegill (Lepomis macrochirus) were
exposed to C11.8 LAS (linear alkylbenzene sulfonate, an anionic
surfactant) under static conditions. Nominal concentrations were not
specified in the report. Measured concentrations were 79 % of nominal
The 96 h LC50 value, based on measured concentration, was 1.67 mg
a.i./L, with 95% CL 1.58 to 1.77 mg/L.
This toxicity study is classified as acceptable and satisfies the
guideline requirement for the current USEPA OPPTS 850.1075 (1996) acute
fish toxicity study.
Fathead minnow LC50 (mg/L)
Average chain length
High molecular weight LAS
Individual homologues LAS
Nonlinear LAS components (DTIS)
87.0 ± 7.5
86.1 ± 15.0
24.8 ± 5.8
21.5 ± 5.5
8.1 ± 5.1
5.3 ± 3.9
Model biodegradation intermediates
C4 (SØ Butyrate)
C5 (SØ Valerate)
85.9 ± 5.1*
76.6 ± 12.4*
repurification of this sample yielded a product with the same isomeric
composition but with LC50 values over 1000 mg/L for fatheads.
Two studies are presented to
characterize the potential aquatic toxicity of LAS. In a 96-hour acute
toxicity study (Lewis and Perry 1979, 1981), bluegill sunfish (Lepomis
macrochirus) were exposed to C11.8LAS under static
conditions in the key study. The measured concentrations were 79 % of
nominal concentrations but were not reported. The 96 hour LC50value,
based on measured concentrations, was 1.67 mg a.i./L. In a second study
(Kimerle and Swisher 1977), 48 hour acute toxicity tests with fathead
minnows (Pimephales promelas) were conducted on high molecular
weight LAS, individual pure homologues, non-linear LAS components
(dialkyl tetralin or indane sulfonates, DTIS), and model biodegradation
intermediates (sulfophenylundecane, SOU) in order to determine whether
biodegradation decreases toxicity. All of the toxicity tests were
conducted in 5 L of 100 mg/L hardness water using 5 fathead minnows per
concentration. Results indicated that the length of the alkyl chain is
the most important factor influencing acute toxicity, which increases as
the alkyl chain increases. These longer alkyl chain homologues are the
first constituents of the LAS mixture to degrade. The nonlinear
components (DTIS) showed 1/2 to 1/10 the toxicity of LAS with the same
carbon chain length. Therefore, toxicity of biodegradation intermediates
is significantly less than the parent LAS.
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