排污河中生物體內(nèi)十溴聯(lián)苯醚（BDE-209）脫溴的證據(jù)（英文文獻原版）


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Evidence of Debromination of Decabromodiphenyl Ether (BDE-209) in Biota from a Wastewater Receiving Stream

abstract：Decabromodiphenyl ether (BDE-209) is a high production
volume flame retardant. To date, regulation and control of
its environmental release have been minimal. Once in
the environment, BDE-209 may encounter conditions favoring
debromination, potentially forming congeners with
greater toxicity, bioaccumulation potential, and persistence.
However, (photolytic and in vivo) debromination has only
been demonstrated under laboratory scenarios. To examine
whether debromination was likely in the field, PBDE
congener profiles were tracked from a wastewater treatment
plant (sludge) to receiving stream sediments and
associated aquatic biota. BDE-209 and 23 additional
PBDEs were detected. Sludge congener profiles resembled
the commercial penta- and deca- formulations, suggesting
minimal -209 debromination during wastewater treatment.
Similar profiles were observed in surficial sediments at the
outfall and downstream. However, sunfish (Lepomis
gibbosus), creek chub (Semotilus atromaculatus), and
crayfish (Cambarus puncticambarus sp. c) collected near
the outfall contained tri- through deca-PBDEs, including
congeners not detected in the commercial deca- mixture,
sludges or sediments (BDE-179, -184, -188, -201, and
-202). A previous in vivo laboratory study identified these
as -209 debromination products. This supports the hypothesis
that metabolic debromination of -209 does occur in the
aquatic environment under realistic conditions. Hence
assessments that assume no BDE-209 debromination may
underestimate associated bioaccumulation and toxicity
attributable to the less brominated congeners produced.