Title: Associate Scientist, Environmental Chemistry & Technology Program, Department of Civil & Environmental Engineering, University of Wisconsin-Madison

Location: Water Science and Engineering Laboratory, University of Wisconsin-Madison , Madison , WI 53706

Phone Number: 608-262-0140 or 608-224-3799

FAX Number: 608-262-0454

E-mail: mshafer@facstaff.wisc.edu, shafermm@mail.slh.wisc.edu

Education

• Post Doctoral. Water Chemistry, University of Wisconsin-Madison 1988-1990
• Ph.D., Water Chemistry, University of Wisconsin-Madison , 1988
• B.S., Chemistry, Rensselaer Polytechnic Institute, 1978.

Research Program:

Inorganic chemistry of atmospheric aerosols; Analytical chemistry and speciation of metals at ultra-trace levels; Plasma mass spectrometry; Trace element biogeochemistry of rivers and associated watersheds; Biological trace metal cycling; Colloid mediated processes in surface and groundwaters; Nutrient and trace element cycles in inland and Great Lakes; Biogeochemistry and cycling of aquatic particulates.

Recent Research Foci:

Speciation controls in natural waters on the bioavailability of metals to aquatic organisms; Development and application of methods to assess the chemical speciation and mobility of metals associated with atmospheric aerosols; Elemental speciation using plasma mass spectrometry (e.g. HPLC-ICP-MS); Ultra-high precision metal isotope ratio measurements (MS-MC-ICP-MS) and application to source reconciliation and environmental partitioning; Development and application of methods to assess the lability of metal-natural complexes in aquatic systems; Reduced sulfur (thiol) biogeochemistry of surface waters; Development of GIS-based models incorporating environmental and geochemical variables to predict particle-partitioning of metals; Analytical mass spectrometry of clinical samples.

Professional Memberships :

American Association for Aerosol Research (AAAR)

American Chemical Society (ACS)

American Society of Limnology and Oceanography (ASLO)

International Association for Great Lakes Research (IAGLR)

Society of Environmental Toxicology and Chemistry (SETAC)

Selected Publications:

Tang, D.,M.M. Shafer, D.A. Karner, J. Overdier, and D.E. Armstrong. Factors affecting the presence of dissolved glutathione in estuarine waters. Accepted to: Environmental Science and Technology. May 2004.

Shafer, M.M ., S.R. Hoffmann, J.T. Overdier, and D.E. Armstrong. 2004. Physical and kinetic speciation of copper and zinc in three geochemically contrasting estuaries. In Press: Environmental Science and Technology. May 2004.

Xu, J., M.H. Bergin, R. Greenwald, J.J. Schauer, M..M. Shafer, J.L. Jaffrezo, and G. Aymoz. 2004. Aerosol chemical, physical, and radiative characteristics near a desert source region of Northwest China during ACE-ASIA. In Press J. Geophysical Research-Atmospheres.

Tang, D., M.M. Shafer, K. Vang, D.A. Karner, and D.E. Armstrong. 2003. Determination of dissolved thiols using solid phase extraction and liquid chromatographic determination of fluorescently derivatized thiolic compounds. J. Chromatogr. A. 998:31-40.

Hurley, J.P., H. Manolopoulos, C.L. Babiarz, H. Sakamoto, K.R. Rolfhus, R.C. Back, M.M. Shafer, D.E. Armstrong, and R. Harris. 2003. Methyl mercury in Lake Superior : Offshore processes and bioaccumulation. Journal De Physique IV, 107:641-644.

Herrin, R.T., A.W. Andren, M.M. Shafer, and D.E. Armstrong. 2001. Determination of silver speciation in natural waters II. Binding strength of silver ligands in surface waters. Environ. Sci. Technol. 35:1959-1966.

Babiarz, C.L., J.P. Hurley, S.R. Hoffmann, A.W. Andren, M.M. Shafer, and D.E. Armstrong. 2001. Partitioning of total mercury and methylmercury to the colloidal phase in freshwaters. Environ. Sci. Technol. 35:4773-4782.

Hoffmann, S.R., M.M. Shafer, C.L. Babiarz, and D.E. Armstrong. 2000. A critical evaluation of tangential-flow ultrafiltration for trace metal studies in fresh water systems: I. Organic carbon. Environ. Sci. Techol. 34:3420-3427.

Babiarz, C.L., S.R. Hoffmann, M.M. Shafer, J.P. Hurley, A.W. Andren, and D.E. Armstrong. 2000. A critical evaluation of tangential-flow ultrafiltration for trace metal studies in fresh water systems: 2. Total mercury and methylmercury. Environ. Sci. Technol. 34:3428-3434.

Shafer, M.M., J.T. Overdier, H. Phillips, D. Webb, J.R. Sullivan, and D.E. Armstrong. 1999. Trace metal levels and partitioning in Wisconsin rivers . Water, Air, and Soil Pollution. 110(3-4) 273-311.

Shafer, M.M., J.T. Overdier, and D.E. Armstrong. 1998. Removal, partitioning, and fate of silver and other metals in waste water treatment plants and effluent-receiving streams. Environ. Toxicol. Chem. 17(4):630-641.

Hurley, J.P., S.E. Cowell, M.M. Shafer, and P.E. Hughes. 1998. Tributary loading of mercury to Lake Michigan : Importance of seasonal events and phase partitioning. Sci. Total Environ. 213(1-3):129-137.

Hurley, J.P., S.E. Cowell, M.M. Shafer, and P.E. Hughes. 1998. Partitioning and transport of total and methyl mercury in the Lower Fox River, Wisconsin. Environ. Sci. Technol. 32(10):1424-1432.

Babiarz, C.L., J.P. Hurley, J.M. Benoit, M.M. Shafer, A.W. Andren, and D.A. Webb. 1998. Seasonal influences on partitioning and transport of total and methylmercury in rivers from contrasting watersheds. Biogeochemistry 41(3):237-257.

Shafer, M.M., J.T. Overdier, J.P. Hurley, D.E. Armstrong and D. Webb. 1997. The influence of dissolved organic carbon, suspended particulates, and hydrology on the concentration, partitioning and variability of trace metals in two contrasting Wisconsin watersheds ( U.S.A. ) Chemical Geology. 136:71-97.

Hurley, J.P., M.M. Shafer, S.E. Cowell, D.E. Armstrong, J.T. Overdier, and P.E. Hughes. 1996. Trace metal assessment of Lake Michigan tributaries using low-level techniques . Environ. Sci. Technol. 30(6):2093-2098.

Hurley, J.P., J.M. Benoit, C.L. Babiarz. M.M. Shafer, A.W. Andren, J.R. Sullivan, R. Hammond, and D.A. Webb. 1995. Influences of watershed characteristics on mercury levels in Wisconsin rivers. Environ. Sci. Technol. 29(7):1867-1875.

Shafer, M.M., and D.E. Armstrong. 1994. Mass fluxes and recycling of phosphorus in Lake Michigan : Role of major particle phases in regulating the annual cycle. In L.A. Baker Ed., “Environmental Chemistry of Lakes and Reservoirs, Advances in Chemistry Series 237”. Am Chem. Soc., Washington , DC . pp 285- 322.

Dean, K.E., M.M. Shafer, and D.E. Armstrong. 1993. Particle-mediated transport and fate of a hydrophobic organic contaminant in southern Lake Michigan : The role of major water column species. J. Great Lakes Res., 19(2):480-496.

Shafer, M.M., and D.E. Armstrong. 1991. Trace element cycling in southern Lake Michigan : Role of water column particle components . In R.A. Baker, Ed., “Organic Substances and Sediments in Water, Vol. 2., Processes and Analytical”. Lewis Publ., Inc., Chelsea , MI. pp. 15-47.

Shafer,M.M., K.E. Dean, and D.E. Armstrong. 1991. Role of mobile colloids in the transport of chemical contaminants in groundwaters. Final report to USGS and University of Wisconsin Water Resources Center, 26 pages.

Armstrong, D.E., J.P. Hurley, D.L. Swackhamer, and M.M. Shafer. 1987. Cycles of nutrient elements, hydrophobic organic-compounds, and metals in Crystal Lake – role of particle mediated processes in regulation. In: “Advances in Chemistry Series 216” pp 491-518.

Manuscripts Submitted for Publication:

Tang, D., M.M. Shafer, D.A. Karner, and D.E. Armstrong. Response of non-protein thiols to copper stress and extracellular release of glutathione in the Diatom Thalassiosira weissflogii. Submitted to: Limnology and Oceanography.

Beard, B., C.M. Johnson, R. Poulson, M.M. Shafer, and J. O’Leary. High precision iron isotope analytical methods and implications for high temperature inter-mineral Fe isotope fractionation. In review at Geochimica et Cosmochimica Acta.