Temporal variability of trace metals in new jersey pinelands streams: relationships to discharge and pH |
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| Institution: | 1. Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, NJ 08901-8521, USA;1. Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, China;2. Qingdao Collaborative Innovation Center of Marine Science and Technology, Qingdao 266100, China;3. State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;4. Ocean College, Zhejiang University, Hangzhou 310058, China;5. State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200062, China;1. Department of Urology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York;2. Department of Obstetrics and Gynecology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York;3. Department of Microbiology and Immunology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York;4. Department of Oncology, Montefiore Medical Center and Albert Einstein College of Medicine, Bronx, New York;1. Department of Ocean, Earth, and Atmospheric Sciences, Old Dominion University, Norfolk, VA, USA;2. Department of Earth, Ocean, and Atmospheric Science, The Florida State University, Tallahassee, FL, USA;1. Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, D-27570 Bremerhaven, Germany;2. Department of Environmental Sciences, School of Tropical and Laboratory Medicine, Hainan Medical University, Haikou 571199, China;3. University of Copenhagen, Marine Biological Section, Strandpromenaden 5, 3000 Helsingør, Denmark;4. Technical University of Denmark, Department of Biotechnology and Biomedicine, Søltofts Plads, 2800 Kgs. Lyngby, Denmark;5. Technical University of Denmark, National Food Institute, Kemitorvet, 2800 Kgs. Lyngby, Denmark;1. College of Life Science and Technology, Jinan University, Guangzhou 510632, China;2. Third Institute of Oceanography, SOA, Xiamen 361005, China;3. Alfred Wegener Institute for Polar and Marine Research, Am Handelshafen 12, D-27570 Bremerhaven, Germany;4. Research Unit for Palaeontology, Ghent University, Krijgslaan 281 S8, 9000 Ghent, Belgium;5. Department of Geography, McGill University, Burnside Hall, 805 Sherbrooke Street West, Montreal, QC, Canada H3A OB9;6. Department of Oceanography and Coastal Sciences, Louisiana State University, Baton Rouge, LA 70803, USA;7. Louisiana Universities Marine Consortium, Chauvin, LA 70344, USA;1. School of Earth and Environmental Sciences, The University of Queensland, St Lucia, QLD 4072, Australia;2. CNR - Istituto di Geoscienze e Georisorse, Via G. La Pira 4, 50121 Florence, Italy;3. Dipartimento di Scienze della Terra, Università degli Studi di Firenze, Via G. La Pira 4, 50121 Firenze, Italy;4. Dipartimento di Scienze Chimiche e Geologiche, Università di Cagliari, via Trentino 51, 09127, Cagliari, Italy |
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| Abstract: | Dissolved and particulate trace metal (Al, Cd, Cu, Pb, and Zn) concentrations were determined over a 21 month time period at four streamwater sites in the Pinelands (New Jersey, USA), a coastal plain region characterized by low-pH waters and highly weathered soils. Al and Zn were also determined at two sites over a 5 day period following a major precipitation event. In the Batsto River (pH 4.4–6.3), a representative Pinelands stream draining a largely forested watershed moderately impacted by agriculture, discharge-weighted mean concentrations of dissolved metals were (in nM): Al = 4610; Cd = 0.39; Cu = 4.6; Pb = 1.0; and Zn = 149. Dissolved Cd, Cu, and Zn in the undeveloped Bass River (pH 4.1–4.8) are in a similar range, but Pb concentration is 2–3 times greater. Dissolved metals show highly significant positive correlations to discharge, and weaker inverse relationships to pH over both the long- and short-term time series. Overall, seasonal and short-term variability in dissolved metal concentrations is most consistent with control by hydrologic flow path changes during high discharge, when shallow groundwaters mobilize anthropogenic metals stored in near-surface soil horizons and bypass potential metal removal processes in bordering wetlands. The data also suggest that in-stream metal removal driven by summertime biological productivity may further reduce low-discharge metal concentrations, as a secondary effect. For these metals, the particulate fraction is generally minor, and variations in solution/particle partitioning are unimportant to spatial/temporal variations dissolved concentrations, except for Pb. Estimates of atmospheric input can account for riverine fluxes of these metals, and suggest that Zn retention is minimal in this system, while Pb, Cu and Cd are more strongly retained. The positive relationship between discharge and metals concentration, and the unusually high concentrations in Pinelands streams compared to other world rivers, suggest that riverine effects on metals distributions in the estuary and nearby coastal ocean will be measurable and strongly seasonal. |
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