Geochemistry of phosphorus in a carbonate aquifer affected by seawater intrusion René M. Price (FIU) Jeremy C. Stalker (FIU) Jean L. Jolicoeur (FIU)

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Presentation transcript:

Geochemistry of phosphorus in a carbonate aquifer affected by seawater intrusion René M. Price (FIU) Jeremy C. Stalker (FIU) Jean L. Jolicoeur (FIU)

Naples Everglades National Park

A 2003 Salinity contour In wells < 25 m A’

A A' Sea Level Surficial Aquifer Seawater Intrusion meters Biscayne Aquifer Tamiami Sands Surficial Aquifer Gray Limestone Aquifer 50 Unnamed Sands Hawthorn Group Seawater Intrusion meters 100 Hawthorn Group (Aquiclude) 300 Floridan Aquifer 1000

Geochemical Parameters P, N, TOC Ca2+, Mg2+, N+, K+, Cl-, SO42-, HCO3- pH, Temp, Sal. Sites sampled in Sept. 2007 Surface water Porewater (30-60 cm) Wells (2 – 8 m)

Groundwater Sampling

(Boyer et al., 1999)

Supersaturation (mineral precipitation) undersaturation (mineral dissolution)

How much P is incorporated in Biscayne Aquifer limestone? Research Question How much P is incorporated in Biscayne Aquifer limestone? What are the adsorption/desorption characteristics of P in fresh versus salty groundwater? Water-Rock Interactions Ion Exchange CaCO3 Dissolution

P Extraction Methods 0.5 g rock Dried and weighed Sequential Extraction MgCl – loosely adsorbed fraction HCl digestion followed by filtration for total P determinations Total P determination on filter residue for organic fraction

Phosphorus in Biscayne Aquifer Limestone

Adsorption/Desorption cube experiments Cube 0.2m on a side of Key Largo Limestone. freshwater (DIW) and seawater matrix with PO43- varying from 0 to 20μM

Breakthrough Curves C/Co liters

Adsorption DIW with 8 and then 20 mM of P

Adsorption DIW vs. Seawater with 8 mM of PO43-

Desorption

Geochemical Analysis

Conclusions Water Table Ocean Brackish Zone Seawater Intrusion Ion Exchange Ocean P CaCO3 Dissolution Brackish Zone Seawater Intrusion

Publications Price, R.M, and P.K. Swart, 2006, Geochemical indicators of groundwater recharge in the Surficial Aquifer System, Everglades National Park, Florida, USA, in Harmon, R.S., and Wicks, C., eds., Perspectives on karst geomorphology, hydrology, and geochemistry—A tribute volume to Derek C. Ford and William B. White: Geological Society of America Special Paper 404:251-266. Price, R.M., P.K. Swart, and J.W. Fourqurean, 2006, Coastal groundwater discharge-an additional source of phosphorus for the oligotrophic wetlands of the Everglades, Hydrobiologia, 569:23-36. Price, R.M, J.D. Happell, Z. Top, and P. K. Swart. 2003, Use of tritium and helium to define groundwater flow conditions in Everglades National Park. Water Resources Research, 39(9), doi:10.1029/2002WR001929.

Acknowledgements Jim Fourqurean –FIU Biology and SERC Len Scinto-FIU SERC Tatiana Marquez-FIU Environmental Sciences Srikumar Roy- IIT Kharagpur, India Kevin Cunningham-USGS Chris Reich-USGS Thomas Smith III- USGS Gordon Anderson - USGS Vic Engel - ENP Jana M. Newman – SFWMD Funding Provided by: South Florida Water Management District and the Southeast Environmental Research Center

PHREEQC Results

Western Coastline of ENP Sept. 2007 (Boyer et al. 1999) Gulf of Mexico