David Vinson
David Vinson
Associate Professor, Department of Geography and Earth Sciences
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    • Water-rock interaction
    • Subsurface biogeochemistry
    • Piedmont shallow groundwater

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Office: 208 McEniry
Email: dsvinson@uncc.edu

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  • Department of Geography and Earth Sciences

naturally-occurring trace elements

Landscape Position, Ferrous Mineral Oxidation, and Dissolved Oxygen: A Critical Zone Perspective to the Inner Piedmont Terrane

March 27, 2025 by David Vinson
Categories: Updates

Coley, J.C., 2024. Landscape Position, Ferrous Mineral Oxidation, and Dissolved Oxygen: A Critical Zone Perspective to the Inner Piedmont Terrane. MS Thesis, UNC Charlotte.

geochemistry, groundwater, Inner Piedmont, naturally-occurring trace elements, thesis, water-rock interaction

Tags: geochemistrygroundwaterInner Piedmontnaturally-occurring trace elementsthesiswater-rock interaction

Naturally-occurring chromium and vanadium in Charlotte Terrane rocks: A source of trace elements to groundwater?

August 17, 2018 by David Vinson
Categories: Updates
Jacey Vail, M.S. thesis, 2017. Naturally-occurring chromium and vanadium in Charlotte Terrane rocks: A source of trace elements to groundwater?
Tags: chromiumfractured crystalline rocksgroundwaternaturally-occurring trace elementsoxyanionsPiedmontthesisvanadiumwater quality

Naturally-occurring boron in NC Coastal Plain groundwater: Contrast in sources or mobilization between confined Cretaceous and Pliocene aquifers

April 20, 2015 by David Vinson
Categories: Presentations

Presentation given at N.C. Water Resources Research Institute annual conference, March 18-19, 2015, Raleigh, NC (co-authors: Gary Dwyer and Avner Vengosh, Duke University)

Abstract:

As a natural trace element that is enriched in specific materials (e.g. wastewater, coal, marine clays), boron (B) has attracted interest in diverse natural and engineered environments. Boron has distinctive concentration in seawater (4.6 mg/L), imparting boron to marine-derived aquifer material such as the Atlantic Coastal Plain (ACP) of NC. In groundwater, expected behavior of B can yield (1) low B concentration and relatively high B-11/B-10 isotope ratio (adsorption) during salinization; or (2) high B concentration and relatively low B-11/B-10 (desorption) during freshening.

Naturally-occurring boron was examined in groundwater of the confined Cretaceous Upper and Lower Cape Fear aquifer of the ACP in NC. 14 monitoring wells were sampled from fresh, Na-bicarbonate to brackish Na-Cl water (Cl concentration 5-4680 mg/L). Several wells exhibited elevated boron (overall 0.4-6.6 mg/L). A large range of B-11/B-10 was observed (8.5‑51.8‰, as δ11B relative to NBS951 standard). Observed B/Cl ratios (0.003-0.255 mol/mol) are ~10‑1000 higher than seawater, implying B desorption from clays. However, observed groundwater δ11B >39‰ is consistent with the residual, unreacted B after adsorption occurs.

This pattern differs from the overlying Pliocene Yorktown aquifer, in which groundwater δ11B (20.9‑34.7‰) is consistent with desorption of seawater-derived B having δ11B of about 39‰ (Vinson et al. 2011, Hydrogeology Journal, v. 19 p. 981). In the Cape Fear, the pattern of B concentration vs. δ11B could indicate: (1) episodes of partial adsorption and desorption have disrupted the boron isotope mass balance; and/or (2) the boron originally adsorbed to clays had δ11B >39‰ (e.g. marine brine).

Tags: boronbrackish waterCoastal Plainnaturally-occurring trace elementsradium isotopes

Radium isotope response during aquifer storage and recovery

October 29, 2014 by David Vinson
Categories: PresentationsUpdates

Presentation at Geological Society of America conference, October 2014 (follow the link to an abstract)

Vinson, D.S., Lundy, J.R., Alvarez, T., and Vengosh, A., 2014. Radium isotope response during aquifer storage and recovery: Alpha recoil and element interactions. Geological Society of America Annual Meeting, Vancouver. Geological Society of America Abstracts with Programs v. 46, no. 3, p. 397.

Tags: aquifer storage and recoverybariumnaturally-occurring trace elementsradium isotopessandstone aquiferstrontium isotopeswater quality

Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA)

August 20, 2014 by David Vinson
Categories: Publications

Vinson, D.S., Vengosh, A., Hirschfeld, D., and Dwyer, G.S., 2009, Relationships between radium and radon occurrence and hydrochemistry in fresh groundwater from fractured crystalline rocks, North Carolina (USA). Chemical Geology, v. 260, p. 159-171, doi: 10.1016/j.chemgeo.2008.10.022.

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Vinson’s full publications list

Tags: fractured crystalline rocksgroundwaternaturally-occurring trace elementsradium isotopesradonwater quality

Radon transfer from groundwater used in showers to indoor air

August 20, 2014 by David Vinson
Categories: Updates

Vinson, D.S., Campbell, T.R., and Vengosh, A., 2008, Radon transfer from groundwater used in showers to indoor air: Applied Geochemistry, v. 23, p. 2676-2685, doi: 10.1016/j.apgeochem.2008.05.021.

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Vinson’s full publications list

Tags: fractured crystalline rocksgroundwaternaturally-occurring trace elementsradonwater quality
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