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EC number: 270-115-0
CAS number: 68411-30-3
The bioaccumulation potential of a series of
LAS homologues and isomers were evaluated in flow-through studies with
fathead minnows. The BCFs were 87 L/kg for a standard mixture typical of
LAS in European detergent formulations (average alkyl chain length =
C11.6) and 22 L/kg for a representative environmental sample (filtered
Mississippi river water, average alkyl chain length = C10.8).
supporting study, the
bioconcentration of LAS in the marine shrimp Palaemonetes varians was
measured in a radiotracer study.The
BCF55 for shrimp was calculated to be 159 L/kg. A DT50 of 14 hrs was
calculated, and only 1% of the body burden of the test substance
remained in the shrimp after 8 days.
bioaccumulation potential of LAS has been evaluated and found to be low
based on aquatic data in fish. BCF values ranged from between 2 and <
1000 L/kg, with a BCF value of 99 for the 2-phenyl isomer of the C12
homologue. In vitro study demonstrate that low bioaccumulation is due to
rapid biotransformation. BCF values for mixtures can be calculated based
on the weight fraction of each homologue. The calculated BCF was 87 L/kg
for a standard mixture typical of LAS in European detergent formulations
(average alkyl chain length = 11.6). The calculated BCF value was 22
L/kg for a representative environmental sample (filtered Mississippi
river water, average alkyl chain length = C10.8), demonstrating that BCF
is decreased by environmental processes such as biodegradation and
absorption, which reduce aquatic concentrations.
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