Abstract：
:We determined polychlorinated biphenyls (PCBs) and radionuclide (137)Cs in sediment cores from the Upper Mississippi River (UMR) and the Iowa River, Iowa, at their confluence. Vertical distribution of (137)Cs indicated negligible mixing in the UMR core, while the Iowa River core showed signs of mixing. A clear (137)Cs peak was found in the UMR core, which was correlated to 1963. The PCB vertical distribution in UMR core was similar to the historical trend in Aroclor production observed in Great Lakes cores, with a peak close to the (137)Cs peak, suggesting a date near 1960. In general, PCB congener profiles in both cores resembled the Iowa soil background signal. We concluded that despite evidence of mixing in the Iowa River core, both cores retain the PCB signature of historical and regional environmental exposure. Further, our results indicate that this iconic waterway has a long history of PCBs that reflects national production and use.
journal_name
Chemospherejournal_title
Chemosphereauthors
Martinez A,Schnoebelen DJ,Hornbuckle KCdoi
10.1016/j.chemosphere.2015.10.090subject
Has Abstractpub_date
2016-02-01 00:00:00pages
1943-9eissn
0045-6535issn
1879-1298pii
S0045-6535(15)30285-Xjournal_volume
144pub_type
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