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EC number: 270-115-0
CAS number: 68411-30-3
level I and II models each resulted in LAS partitioning to air, water,
soil, and sediment at percentages of 0%, 25.97%, 56.09%, and 17.76%,
overall residence time of LAS is 100 hours and removal is primarily by
biodegradation in water (76%) and partitioning in sediment (13%). Thus,
the impacts of LAS will be restricted to local receiving waters and
their sediments and biota. In
level III, when discharges are directly to water, the residence time is
33 hours and more than 99% remains in the water, though in shallower
receiving waters more partitioning to sediments might be expected. When
the discharge is to soil, as was assumed in the ChemCAN model, the
residence time is 28 days because of the slower biodegradation rate and
little transfers to other media. Based
on these findings, the dominant fate processes are degradation rates in
water and soil, and water-sediment transfer.
on an estimated total discharge to the environment of 1.44 x 106kg/year
(1.44 x 105 kg
to water and 1.296 x 106kg to soil). It
should be noted that the discharge assumptions used by the authors are
highly conservative and likely overpredict the amount of LAS entering
various compartments, for example, the soil compartment. This
study was conducted by the model developer and acknowledged expert on
fugucity to demonstrate that the approach was appropriate for different
types of chemicals.
Fugacity modeling of LAS was
done using several different models: level I, II, and III, the ChemCAN
model, and the WW-TREAT, GRiDS, and ROUT models. Based on these
findings, the dominant fate processes are degradation rates in water and
soil, and water-sediment transfer.
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