My research is in the field of environmental mineralogy and geochemistry, focusing on the fate and transport of metals and radionuclides in the environment. In particular, I am interested in the geochemical and biogeochemical processes that occur at mineral surfaces which can limit or promote contaminant transport in a range of surface environments. My research has ranged from applied characterization studies of uranium and copper speciation at the U.S. Department of Energy's Hanford Site, to fundamental studies of the processes by which uranium and strontium are sequestered at mineral surfaces.; Recent work has aimed at determining the mechanisms by which heavy metals or radionuclides can interact with complex mineral interfaces, in particular focusing on the formation of uranium-bearing nanoparticles.; This work is done by applying laboratory-based analytical and microscopy tools and synchrotron-based X-ray spectroscopic and scattering methods to investigate natural and model systems.
Current and future research interests include:
Electron transfer reactions between aqueous contaminants and mineral surfaces
Metal sorption and diffusion kinetics into mesoporous materials
Laboratory- and field-scale testing of metal remediation and stabilization techniques
Singer, D.M. (accepted) The effects of natural mineral coatings on metal transport in contaminated aquifers. Encyclopedia of Water: Science, Technology, and Society. Ed. P. Maurice
Singer, D.M., Jefferson, A.J., Traub, E.L., and Perdrial, N. The relationship between hydro-geomorphic setting and geochemical gradients along flowpaths in stream sediments impacted by acid mine drainage. Elementa. 6,16.
Herndon, E., Havig, J., Singer, D.M., Michael McCormick, M., Kump, L. Manganese and iron geochemistry in sediments underlying the redox-stratified Fayetteville Green Lake. Geochem. Cosmochim. Acta. 231, 50-63
Schindler, M., Singer, D.M. (2017) Mineral Surface Coatings: Environmental Records at the Nanoscale. Elements 13, 159-164.
Schindler, M., Singer, D.M. Mineral Surface Coatings: Environmental Records at the Nanoscale. Elements 13, 159-164
Herndon, E., **AlBashaireh A., Singer, D.M., Chowdhury, T.R., Gu, B., and Graham D. (2017) Influence of iron redox cycling on organo-mineral associations in Arctic tundra soil. Geochem. Cosmochim. Acta. 207, 210-231
Singer, D.M., Griffith, E.M., Senko, J.M., Fitzgibbon, K., Widanagamage, I.H., 2016. Celestine in a sulphidic spring barite deposit - a potential biomarker? Chem. Geol. 440: 15-25
Widanagamage, I.H., Griffith, E.M., Singer, D.M., Scher, H.D., Buckley, W.P., and Senko, J.M. (2015) Controls on stable Sr-isotope fractionation in continental barite. Chem. Geol. 411, 215-227
Reilly, D., Singer, D.M., Jefferson, A., and Eckstein, Y. (2015) Identification of local groundwater pollution in northeastern Pennsylvania: Marcellus flowback or not? Environmental Earth Sciences, 1-13
Singer, D.M., Guo, H., and Davis, J.A. (2014) U(VI) and Sr(II) batch sorption and diffusion kinetics into mesoporous silica (MCM-41). Chem. Geol. 390, 152-163