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Time Trends of Selected Persistent Organic Pollutants in Lake Sediments from Greenland
journal contribution
posted on 2003-08-20, 00:00 authored by Carola Malmquist, Richard Bindler, Ingemar Renberg, Bert van Bavel, Edvard Karlsson, N. John Anderson, Mats TysklindSediments from seven lakes in West Greenland were
used as natural archives to study past and present levels
of PCBs (polychlorinated biphenyls, tri- to decachlorinated),
tetra-BDE #47 (2,2‘,4,4‘-bromodiphenyl ether), chlordane (cis-
and trans-octachlordane) and HxCBz (hexachlorobenzene).
The concentrations found are lower than or comparable
to concentrations found in sediments from other Arctic regions
and one to 2 orders of magnitude lower than concentrations
typically found in sediments at lower latitudes. The
observed temporal trends (direct and indirect dating)
show a decreasing total PCB concentration. Even though
local contamination sources exist, the POP deposition
in the studied area is most likely a result from long-range
transport. The hypothesis about ”cold condensation”
suggests a latitudinal fractionation to occur between
different volatile compounds during the transport toward
the pole. In this study a time delay in the deposition for the
low-chlorinated PCBs (tri- and tetrachlorinated), compared
to their emission histories and compared to higher
chlorinated PCBs, was indicated. Although very low tetra-BDE #47 concentrations are observed in this study,
there are indications for an increasing concentration in
recent sediment layers that may reflect increasing
environmental concentrations at lower latitudes. The
investigated pesticides are still in use at lower latitudes,
however neither chlordane nor HxCBz show any distinct
temporal trend of increasing or decreasing concentration
toward the sediment surface.
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time delayGreenland Sedimentslatitudesediment surfaceSelected Persistent Organic PollutantsArctic regionssediment layersPOP deposition2 orderslatitudinal fractionationemission historiesLake Sedimentschlorinated PCBsWest GreenlandPCB concentrationHxCBz showtime Trendspolychlorinated biphenylscontamination sources
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