trace metal analysis of sediments in the park river watershed, hartford, ct jonathan gourley and...
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![Page 1: Trace Metal Analysis of Sediments in the Park River Watershed, Hartford, CT Jonathan Gourley and Victoria Doñé Environmental Science Program Trinity College,](https://reader036.vdocument.in/reader036/viewer/2022062320/56649d425503460f94a1d4f5/html5/thumbnails/1.jpg)
Trace Metal Analysis of Sediments in the Park River Watershed, Hartford, CT
Jonathan Gourley and Victoria DoñéEnvironmental Science Program
Trinity College, Hartford CT
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Acknowledgements
• Trinity College’s Faculty Research Grant program
• Trinity College undergraduate research students and faculty
• Mary Rickel Pelletier – Park River Watershed Revitalization Initiative
Photos by Kelsey Semrod
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Regional basins with EPA designated impaired reaches
Park RiverWatershed
Hartford
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24 of the 69 causes of impairment in the Lower Connecticut are listed as “CAUSE UNKOWN”
35%
27.5%
Of the approved TMDL studies for watershed- 76% are for E. Coli
Data from US EPA Section 303(d) List Fact Sheet for Lower Connecticut Watershed
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What role do toxic trace metals play in the impairment of the Park River
Watershed?
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Engage undergraduate students in long term research projects
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T
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1) Determine concentration of toxic trace metals in the Park River
sediment
• Watershed wide survey• Use Inductively Couple Plasma – Optical
Emission Spectroscopy (ICP-OES) to analyze sediment samples using weak-acid digestion following method of Giddings et al. (2000)
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2) Identify local problem point sources
Photo by Nathan Sell
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3) Compare sediment data to macroinvertebrate data
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4) Model downstream transport of toxic metals
• Channelization and impervious runoff creates “flashy” storm events
• What is the sediment’s “memory” of toxic trace metals?
• What is the impact of contaminated Park River sediments on the Lower Connecticut watershed?
Photo by Nathan Sell
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Hartford, CT 1864
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North Branch
South Branch
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Photo by Nathan Sell
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19 %
28%
Park River Watershed Impervious Surfaces
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Connecticut Department ofEnvironmental Protection
Leachate point source discharges
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Which toxic trace metals are found in high concentration in the Park River
sediments?
• Impervious runoff, point source discharges from metal finishing industry
• Use Right To Know Network (RTK) to identify toxic metal discharges directly in to the River
• Pb, Zn, Cu, Cd• 2008 - Established baseline concentrations in
North Branch sediments
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Sediment sample locationsfor trace metal analysis
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upstream downstream
SQG Range = 270 – 820 ppm
PEC = 459 ppm
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PEC = 149 ppm
upstream downstream
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Range 3-10 ppm
PEC = 4.9 ppm
upstream
SQG Range = 3-10 ppm
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Connecticut Department ofEnvironmental Protection
Leachate point source discharges
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Good
Poor
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Moving forward
• Determine availability of metals to biota – conduct acid-volatile sulfide (AVS) study
• Understand temporal variations in concentration; sediment memory
• Determine toxic metal contribution of Park River to Lower CT watershed
• Determine concentration of metals in water samples
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FLOW
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Contoured concentrations of Pb in sediments (ppm)
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Conclusions
• Significant difference in trace metal concentrations between north and south branch of the Park River
• Significant difference in macroinvertebrate population of north and south branch
• Indentified sampling locations with high trace metal concentrations that are good candidates for detailed contaminant plume analysis
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Thank You!
Photo by Nathan Sell