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EC number: 214-604-9
CAS number: 1163-19-5
[BDE209] in background (reference) soils
ranged from 0.015 -0.75 ng/g dw, except for 1 farm which was impacted by
river sediment flooding was 1.9 ng/g dw. At the 3 research stations
which had been amended with sewage sludge, the concentrations ranged
from 0.028 -1.0 ng/g dw. One farm where sewage-sludge had been applied
had [BDDE209] of 2200 ng/g dw. The other farm which was periodically
flooded by the River Visken, which received effluents from textile
industries, had [BDE209] of 350 ng/g dw. The farm with the highest
[BDE209] had last recieved sludge application 20 yr prior to sampling.
The authors concluded no evidence of photolytic breakdown of BDE209 was
seen based on the chromatograms of the soils, in contrast to their
previous work indicating photolytic debromination of BDE209 applied to
"artificially to soil with solvent in laboratory and field experiments
(Soderstrom et al. 2004). Further, laboratory experiments with the
high-BDE209 -soil showed no change in peak patterns with the lenght of
UV exposure. The authors indicated soil ageing ahs been shown to
encapsulate and shield contminants so they are less accessible to
microbial breakdown, and also probably sunlight. The fact that the soils
were plowed under was also thought to impact sunlight exposure. The
authors concluded "The results with soils collected in the field show
the importance of following up laboratory studies with field studies."
Although microbial degradation was not specifically studied, it is
reasonable to conclude as there was no evidence of photolytic
degradation to lower brominated congeners, a similar conclusion can ge
reached for microbial degradition.
Sellstrom et al. (2005) reported there was
no evidence for the photolytic degradation of BDE209 in agricultural
soil on which sewage sludge containing the substance had been spread or
on soils subject to periodic flooding with river sediment. Both
the sludge and river sediment were known to contain DecaBDE. Analysis
occurred some 20+ years after the last application of sludge. Although
Sellstrom et al. did not specifically address microbial degradation, it
is reasonable to conclude that no evidence for microbial degradation was
found based on the author’s statement regarding photolysis.
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