Research Conducted by the UD Environmenal Soil Chemistry Group

Plant and Soil Sciences
152 Townsend Hall
Newark, DE 19717

PH: (302) 831-2532

FAX: (302) 831-0605

Research Conducted by the UD Environmental Soil Chemistry Lab

Recent Abstracts
From the National Synchrotron Light Source 2003 Activity Report
Mechanisms of Selenate Adsorption on Iron Oxides and Hydroxides D. Peak and D.L. Sparks Beamline X11A
Chemical Forms of Zinc in a Smelter-Contaminated Soil A.C. Scheinost, R. Kretzschmar, S. Pfister, D.R. Roberts, and D.L. Sparks Beamline X11B
X-ray Absorption Study of the Uptake of Pb(II) at the Solid-Water Interface of Amorphous Silica E.J. Elzinga and D.L. Sparks Beamline X11A

From the National Synchrotron Light Source 2002 Activity Report
Arsenic Speciation in a Lead-Arsenate Contaminated Orchard Soil M. Gräfe, D. Sparks and A. Lanzirotti Beamline(s): X26A
The Speciation of Arsenate (As(V)) at the Goethite-Water Interface in the Presence of Zinc (II) M. Gräfe, M. Nachtegaal and D. Sparks (U. of Delaware) Beamline(s): X11A
A P-XANES Study of Phosphate Sorption to Gibbsite and Calcium Carbobate S. Hunger, K.E. Staats and D. L. Sparks (U. of Delaware) Beamline(s) X19A
Carbon Spectromicroscopic Studies of Metal Interactions M. Nachtegaal (U. of Delaware), E.A. Ghabbour (Northeatern U.), G. Davis (Northeatern U.), S. Wirick, C. Jacobsen (SUNY, Stony Brook) and D. L. Sparks (U. of Delaware) Beamline: X1A1
Sorption of heavy Metal Containants onto hydrated Ferric Oxides: Mechanistic Modeling using X-ray Adsorption Spectroscopy P. Trivedi, D. L. Sparks (U. of Delaware) and K. Pandya (NRL) Beamline(s) X11A

Arsenate Surface Speciation at the Hematite-Water Interface Y. Arai and D.L. Sparks (U. of Delaware) Beamline: X11A
Nickel Sorption Mechanisms in Competitive Sorbent Systems M. Nachtegaal and D. Sparks (U. of Delaware) Beamline(s): X11A
Competitive Sorption of Phosphate and Calcium at the Gibbsite-Water Interface: A P-XANES Study S. Hunger and D. L. Sparks (U. of Delaware) Beamline(s) X19A
Direct Speciation of Phosphate in Poultry Litter using XANES Spectroscopy D. Peak, Y.A. Arai, S.H. Hunger, J.T. Sims, and D.L. Sparks (U. of Delaware) Beamline(s) X19A
Solid State Speciation of Arsenic in Poultry Litter Y. Arai and D. L. Sparks (U. of Delaware) Beamline(s): X26A
Direct Arsenic Speciation in Soils using Macroscopic and Micro-focused Spectroscopic Techniques M. Gräfe and D.L. Sparks (U. of Delaware) Beamline(s): X26A

From the National Synchrotron Light Source 2000 Activity Report

In Situ Carbon Speciation of Soil Organic Matter - Application of X-Ray Absorption Spectromicroscopy A. Scheinost (ETH Zurich), S. Abend (SUNY, Stony Brook), E. Elzinga and M. Nachtegaal (U. of Delaware), C. Jacobsen (SUNY, Stony Brook) and D. Sparks (U. of Delaware) Beamline: X1A
A Spectromicroscopic Study of Soil Organic Matter M. Nachtegaal and D.L. Sparks (U. of Delaware), and C. Jacobsen (SUNY, Stony Brook) Beamline: X1A
Speciation of Smelter Contaminated Soils using XAFS Spectroscopy D.R. Roberts and D.L. Sparks (U. of Delaware) Beamline: X11A
X-ray Absorption Spectroscopic Investigation of Arsenite and at the Aluminum Oxide-Water Interface Y. Arai, E. Elzinga and D.L. Sparks (U. of Delaware) Beamline: X11A
Speciation of Phosphorus and Sulfur in Mineral and Natural Systems J.D. Peak and D.L. Sparks (U. of Delaware) Beamline: X19A
Arsenic Solid State Speciation in Industrially Contaminated Materials Using Microfocused (μ)XANES and XRF Y. Arai, J.Dyer and D. L. Sparks (U. of Delaware) Beamline: X26A
Microscale Zn Speciation in Smelter-contaminated Soils D.R. Roberts and D.L. Sparks (U. of Delaware) Beamline: X26A

Recent Funding

Sparks, D.L. and Y. Jin. 2001-2004. Effect of Colloids on Virus Survival and Transport in Porous Media. USDA-NRICGP $315,000.

Sparks, D.L. 2001-2002. Surface complexation modeling of metal retention/ sequestration on sediments, soil components, and soils. DRP State and DuPont Co. $50,000.

Sparks, D.L. 2000-2003. USGS Fellowship - Stefan Hunger . $48,000

Sparks, D.L. 1999-2002. The influence of aging and competitive sorption on the stabilization of metals via surface precipitation in soils. USDA-NRICGP $330,000

Sparks, D.L. 1999-2000. Surface complexation modeling of metal retention/ sequestration on sediments, soil components, and soils. DRP State and DuPont Co. $50,000.

Sparks, D.L. 1997-1998. Surface complexation modeling of metal retention/ sequestration on sediments, soil components, and soils. DRP State and DuPont Co. $75,000

Sparks, D.L. 1999-2002. NSF Fellowship - Derek Peak . $75,000

Sparks, D.L. 1998-2001. NSF Fellowship - Darryl Roberts . $75,000

Sims, J.T., and D.L. Sparks. 1996-1999. Geochemistry, geostatistics, and hydrology of phosphorous losses in agricultural drainage in the Atlantic Coastal Plain: Developing improved phosphorus management practices for surface water protection. USGS. $208,160

Sparks, D.L. 1996-1998. Use of X-ray absorption spectroscopy in remediation of contaminated soils. DRP-State and DuPont Co. $135,000

Sparks, D.L. 1996-1998. Mechanisms of industrial contaminant interactions with soils. DRP-State and DuPont Co. $75,000

Sparks, D.L., A.M. Scheidegger, and G.M. Lamble. 1996. Effect of residence time on mechanisms of metal retention/release on soils. USDA-NRICGP. $242,000

Sparks, D.L. 1995. Effect of aging on the mechanisms of metal retention on soil components using x-ray absorption fine structure (XAFS) spectroscopy. College of Agric. Sciences Competitive Grant. $25,000

Sparks, D.L. 1994. Acquisition of atomic force microscope. UNIDEL, $75,000

Sparks, D.L. 1994-1996. Use of x-ray absorption spectroscopy in remediation of contaminated soils. DRP - State and DuPont Co. $83,000

Sparks, D.L. 1994-1996. Mechanisms of industrial contaminant interactions with soils. DRP - State and DuPont Co. $83,000

Sparks, D.L. 1994-1995. Use of x-ray absorption spectroscopy in remediation of contaminated soils. State of Delaware and DuPont Co. $50,000

Sparks, D.L. 1992-1995. Desorption and redox behavior of Ni and Cr from lunar simulants using equilibrium and kinetic approaches, NASA. $66,000

Sparks, D.L., and Z.Z. Zhang. 1992-1994. Mechanisms of industrial contaminant interactions with soils, State of Delaware and DuPont Co. $123,000

Sparks, D.L. 1991-1993. DuPont Science and Engineering Grant to Department of Plant and Soil Sciences, DuPont Co. $30,000

Allen, H.E., C.P. Huang, and D.L. Sparks. 1990-1991. Adsorption of metals to New Jersey soils. N.J. Dept. of Environmental Protection. $57,357

Sparks, D.L. 1992-1993. Effects of kinetics on boron mobility in soils. Foundation for Agronomic Research. $40,000

Dentel, S., and D.L. Sparks. 1991-1993. Equilibrium and kinetic studies of selective organic adsorption by surfactant-modified clays. U.S. Geological Survey. $131,027

Sparks, D.L. 1991-1993. Desorption/dissolution kinetics of metals and radionuclides from soil components. Washington State University, Battelle - DOE. $109,000

Sparks, D.L. 1991-1993. Sorption and desorption kinetics of pesticides on Delaware soils and soil constituents. Department of the Interior, DE Water Resources Center. $25,500

Sparks, D.L. 1991-1993. Dynamics of ionic reactions on filtercake materials. E.I. DuPont de Nemours Corp. $107,000

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