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The Anacostia River in Washington, DC is among the ten most contaminated rivers in the USA, containing sewage, metals, PAHs, and PCBs. Seventy-five percent of its watershed is urban or impervious. The biogeochemical characteristics of urban rivers, including the Anacostia, remain largely unstudied. Here we examine the base-flow geochemistry of the tidal freshwater Anacostia over a two-year period...
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