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Geosciences 2017, 7(4), 108; doi:10.3390/geosciences7040108

Nutrients and Heavy Metals Contamination in an Urban Estuary of Northern New Jersey

Department of Earth and Environmental Sciences, New Jersey City University, 2039 Kennedy Boulevard, Jersey City, NJ 07305, USA
Received: 8 September 2017 / Revised: 15 October 2017 / Accepted: 19 October 2017 / Published: 23 October 2017
(This article belongs to the Special Issue Urban Environmental and Medical Geochemistry)
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Abstract

The Newark Bay Estuary in northern New Jersey contains one of the largest urban wetland complexes in the United States, but the majority of the wetlands and habitats have been lost due to urbanization and industrialization. Field and laboratory research was conducted to understand the impacts of human activities on the biogeochemistry of nutrients and heavy metals in the urban estuary. Concentrations of dissolved nutrients such as nitrate, ammonia, and phosphate were higher in the Hackensack River than in the Passaic River or the Newark Bay, while the Hackensack River was more deficient in dissolved oxygen. Sediment oxygen demand and mobilization of nutrients were higher in sediments with higher organic matter content as a result of microbial decomposition of organic matter. Heavy metals (Cr, Cu, Pb, and Zn) and organic matter were more enriched in finer sediment grains such as silt and clay. There were positive correlations among heavy metals as well as organic matter in sediments. The results suggest that fine grained sediments, which can be readily suspended and transported during tidal cycles, may play a significant role in biogeochemical cycling of nutrients and heavy metals in the urban estuary. It appears that the current sources of nutrients and heavy metals in the water and sediment of the Newark Bay Estuary are mainly domestic effluents from sewage treatment plants during non-storm periods as well as combined sewer overflows during storm events, but further research including more frequent and pervasive water and sediment quality monitoring during dry and wet periods is needed. View Full-Text
Keywords: nutrients; heavy metals; Newark Bay estuary; sewage treatment plants; combined sewer overflows nutrients; heavy metals; Newark Bay estuary; sewage treatment plants; combined sewer overflows
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jung, H.B. Nutrients and Heavy Metals Contamination in an Urban Estuary of Northern New Jersey. Geosciences 2017, 7, 108.

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