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EC number: 271-089-3
CAS number: 68515-47-9
DTDP has a
low potential to bioaccumulate in the environment based on results from
a calculated bioconcentration factor value, a fish dietary lab study
with on biomagnifications, results from analogs in a bioaccumulation
food-web field study, and a measured biota-soil accumulation factor
(BSAF) for a soil-dwelling invertebrate.
of DTDP to bioaccumulate is low.
molecular weight phthalate esters (di-C8 PEs to di-C10 PEs) have been
shown not to biomagnify through the food web, but rather decrease in
tissue concentration with increasing trophic position. The results of a
study to assess the bioaccumulation of high molecular weight phthalate
diesters in an aquatic food-web that included 18 marine species, showed
that DIDP did not biomagnify, but rather decreased in tissue
concentration in organisms of increasing trophic position. Decreasing
concentrations, also referred to as biodilution, can be quantified by
food-web magnification factors (FWMFs). A FWMF that is greater than 1.0
is an indication of chemical biomagnification within a food-web, whereas
a value of less than 1.0 indicates biodilution or dilution from lower to
higher trophic levels. Study results showed that lipid equivalent
concentrations of the high molecular weight phthalate diesters
significantly declined with increasing trophic level and that the FWMF
for di-isodecyl phthalate was 0.44. Similar
results would be expected with DTDP, an analog of DIDP.
finding above is consistent with a laboratory fish bioaccumulation study
in which rainbow trout were fed a DTDP spiked diet for 9 days. The low
water solubility and high Kow of DTDP prevent conducting an aqueous
exposure BCF (bioconcentration factor) study. At the end of the exposure
period, fish were sampled after different depuration times (0, 1, 3
days). Results demonstrated limited bioaccumulation with a lipid
normalized biomagnification factor (BMF, concentration ratio in tissue
to that in diet) of 0.004 and rapid subsequent depuration with a tissue
elimination half-life of less than 1 day. The half-life of 1 day was
used to calculate a BCF in fish of 1 L/kg for DTDP.
BCF data for di-isotridecyl phthalate (DTDP) suggest that it has a low
potential to bioconcentrate in the aquatic environment.
to assess the potential for terrestrial bioaccumulation of DIDP were
reported in a 14-day earthworm (Eisenia fetida) toxicity study.
The biota-soil accumulation factor (BSAF) as measured in a natural soil
was 0.015 based on a DIDP concentration in the earthworm of 120 mg/kg
(wet weight) and in soil of 7829 mg/kg (dry weight). A BSAF value of 1
indicates a lack of bioaccumulation. Similar results would be expected
with DTDP, an analog of DIDP.
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