Diurnal variations in,and influences on,concentrations of particulate and dissolved arsenic and metals in the mildly alkaline Wallkill River,New Jersey,USA |
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Authors: | Julia L Barringer Timothy P Wilson Zoltan Szabo Jennifer L Bonin Jeffrey M Fischer Nicholas P Smith |
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Institution: | (1) US Geological Survey, New Jersey Water Science Center, 810 Bear Tavern Road, West Trenton, NJ 08628, USA |
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Abstract: | Diurnal variations in particulate and dissolved As and metal concentrations were observed in mildly alkaline water from a
wetlands site on the Wallkill River in northwestern New Jersey. The site, underlain by glacial sediments over dolomite bedrock,
is 10 km downstream from a mined area of the Franklin Marble, host to Zn ores, also As and Mn minerals. In mid-September 2005,
maxima and minima in dissolved-oxygen-concentration and pH, typically caused by photosynthesis and respiration, occurred at
2000 and 0800 hours. Concentrations of dissolved As (1.52–1.95 μg/L) peaked at dusk (2000 hours), whereas dissolved Mn and
Zn concentrations (76.5–96.9 and 8.55–12.8 μg/L, respectively) were lowest at dusk and peaked at 1000 hours. These opposing
cycles probably reflect sorption and desorption of As (an anion), and Mn and Zn (cations) as pH varied throughout the 24-h
period. Doubly-peaked cycles of B, Cl, SO4, and nutrients also were observed; these may result from upstream discharges of septic-system effluent. Both recoverable
amd particulate Al, Fe, Mn, and Zn concentrations peaked between 0200 and 0600 hours. The particulate metals cycle, with perturbations
at 0400 hours, may be influenced by biological activity. |
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Keywords: | Diurnal Arsenic Metals Geochemistry Wallkill River New Jersey USA |
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