Associate Professor Ronald L. Siefert



“Electrochemical Detection with Preconcentration: Nitroenergetic Contaminants”, B. J. Johnson, M. Nasir, R. L. Siefert, I. A. Leska, J. S. Erickson, P. T. Charles, B. J. Melde, and J. R. Taft, Chemosensors, 2(2), 131-144, doi: 10.3390/chemosensors2020131, (June 2014).

“Extraction of Perchlorate Using Porous Organosilicate Materials”, B. J. Johnson, I. A. Leska, B. J. Melde, R. L. Siefert, J. R. Taft, J. R. Deschamps, Materials, 6, 1403-1419, (March 2013).

“Luxury uptake of aerosol iron by Trichodesmium in the western tropical North Atlantic”, Y. Chen, A. Tovar-Sanchez, R. L. Siefert, S. A. Sanudo-Wilhelmy, G. S. Zhang, Geophysical Research Letters, 38, L18602, 10.1029/2011GL048972, (2011).

“Atmospheric iron deposition: Global distribution, variability, and human perturbations”, Mahowald N. M., Engelstaedter S., Luo C., Sealy A., Artaxo P., Benitez-Nelson C., Bonnet S., Chen Y., Chuang P. Y., Cohen D. D., Dulac F., Herut B., Johansen A. M., Kubilay N., Losno R., Maenhaut W., Paytan A., Prospero J. M., Shank L. M., and Siefert R. L., Annual Review of Marine Science, 1, (2009).

“Determination of ammonia emission rates from a tunnel ventilated chicken house using passive samplers and a Gaussian dispersion model”, Siefert R. L.  and Scudlark J. R., Journal of Atmospheric Chemistry, 10.1007/s10874-007-9082-x, (2008).

“Global distribution of atmospheric phosphorus sources, concentrations and deposition rates, and anthropogenic impacts”, Mahowald, N., Jickells, T. D., Baker, A. R., Artaxo, P., Benitez-Nelson, C. R., Bergametti, G., Bond, T. C., Chen, Y., Cohen, D. D., Herut, B., Kubilay, N., Losno, R., Luo, C., Maenhaut, W., McGee, K. A., Okin, G. S., Siefert, R. L., Tsukuda, S., Global Biogeochemical Cycles, GB4026, Vol. 22, Issue 4, (2008).

“Kinetic and equilibrium constants of phytic acid and ferric and ferrous phytate derived from nuclear magnetic resonance spectroscopy”, Heighton L., Schmidt W. F.  and Siefert R. L., Journal Agricultural and Food Chemistry, 56(20), (2008).

“Electrospray ionization mass spectroscopy shows speciation of phytate to be pH dependent”, Heighton L., Schmidt W. F., Rice C. P.  and Siefert R. L., Journal of Food, Agriculture & Environment, 6(2), (2008).

“Combustion iron distribution and deposition”, Luo C., Mahowald N., Bond T., Chuang P. Y., Artaxo P., Siefert R. L., Chen Y., and Schauer J., Global Biogeochemical Cycles, 22, GB1012, doi:10.1029/2007GB002964, (2008).

“Estimation of iron solubility from observations and a global aerosol model”, Luo C., Mahowald N. M., Meskhidze N., Chen Y., Siefert R. L., Baker A. R., and Johansen A. M., J. Geophysical Research, 110(D23), D23307, (2005).

“The Role of Coastal Zones in Global Biogeochemical Cycles: Meeting Report”, Siefert R. L. and Plattner G. K., Eos, 85(No. 45), 9 November, (2004).

“Estimation of atmosphere-processed soluble iron from observations and a global mineral aerosol model”, Hand J. L., Mahowald N. M., Chen Y., Siefert R. L., Luo C., Subramaniam A., and Fung I., J. Geophysical Research, 109(D17), D17205, doi:10.1029/2004JD004574, (2004).

“Characterization of atmospheric ammonia emissions from commercial chicken houses on the Delmarva Peninsula”, Siefert R. L., Scudlark J. R., Potter A. G., Simonsen A. and Savidge K. B., Environ. Sci. & Technol. 38(10); 2769-2778, (2004).

“Seasonal and spatial distributions of atmospheric total and labile iron over the tropical and sub-tropical north Atlantic Ocean”, Chen Y. and Siefert R. L., J. Geophys. Res., 109, D09305, doi:10.1029/2003JD003958, (2004).

“Determination of various types of labile atmospheric iron over remote oceans”, Chen Y. and Siefert R. L., J. Geophys. Res. 108(D24), 4774, doi:10.1029/2003JD003515, (2003).

"Marine pollution in the United States: Significant accomplishments, future challenges," Boesch D. F., Burroughs R. H., Baker J. E., Mason R. P., Rowe C. L. and Siefert R. L., Pew Oceans Committee Report, (2001).

"A revised nitrogen budget for the Arabian Sea," Bange H. W., Rixen T., Johansen A. M., Siefert R. L., Ramesh R., Andreae M. O., Ittekkot V. and Hoffmann M. R., Global Biogeochemical Cycles, 14 (4), 1283-1297, (2000).

"Design and characterization of a fluidized bed aerosol generator: A source for dry, submicrometer aerosol," Prenni A. J., Siefert R. L., Onasch T. B., Tolbert M. A. and DeMott P., J. of Aerosol Sci. & Technol. 32(5), 465-481, (2000).

"Chemical composition of aerosols collected over the tropical Atlantic Ocean" Johansen A. M., Siefert R. L. and Hoffmann M. R., J. Geophys. Res. 105(D12),15277-15312, (2000).

"Infrared spectroscopic study of the deliquescence and efflorescence of ammonium sulfate aerosol as a function of temperature," Onasch T. B.,, Siefert R. L., Brooks S. D., Prenni A. J., Murray B., Wilson M. A. and Tolbert M. A., J. Geophys Res. 104(D17), 21317-21326, (1999).

"Chemical characterization of ambient aerosol collected during the southwest-monsoon and inter-monsoon seasons over the Arabian Sea:  Anions and cations," Johansen A. M., Siefert R. L., Hoffmann M. R., J. Geophys. Res. 104(D21), 26325-26347, (1999).

"Chemical characterization of ambient aerosol collected during the southwest monsoon and inter-monsoon seasons over the Arabian Sea: Labile-Fe(II) and other trace metals," Siefert R.L., Johansen A.M. and Hoffmann M.R., J. Geophys. Res. 104(D3), 3511-3526, (1999).

"Composition-dependent freezing nucleation rates for HNO3/H2O aerosols resembling gravity-wave-perturbed stratospheric particles,"  Prenni A. J., Onasch T. B., Tisdale R. T., Siefert R. L. and Tolbert M. A., J. Geophys. Res, 103 (D21), 28,439-28,450 (1998).

"An extensive bloom of the N2-fixing cyanobacterium, Trichodesmium erythraeum, in the central Arabian Sea," Capone D. G., Subramaniam A., Montoya J. P., Voss M., Humborg C., Johansen A. M., Siefert R. L. and Carpenter E. J., Marine Ecology Progress Series, 172, 281-292, (1998).

"Measurements of trace metal (Fe, Cu, Mn, Cr) oxidation states in fog and stratus clouds," Siefert R.L., Pehkonen S.O., Johansen A.M. and Hoffmann M.R., J. Air & Waste Management, 48(2), 128-143 (1998).

"Determination of photochemically available iron in ambient aerosol," Siefert R.L., Webb S.M. and Hoffmann M.R., J. Geophys. Res., 101, 14441-14449 (1996).

"Photoreduction of iron oxyhydroxides and photooxidation of halogenated acetic acids: Implications for tropospheric chemistry," Pehkonen S.O., Siefert R.L. and Hoffmann M.R., Environ. Sci. & Technol. 29, 1215 -1222 (1995).

"The dynamic chemistry of transition metals in the troposphere," Pehkonen S. O., Erel Y., Siefert R. L., Klewicki K., Hoffmann M. R. and Morgan J. J., Isr. J. of Earth Sci., 43, 279-295 (1995).

"Iron photochemistry of aqueous suspensions of ambient aerosol with added organic acids," Siefert R.L., Pehkonen S.O., Erel Y. and Hoffmann M.R., Geochimica et Cosmochimica Acta, 58(15), 3271-3279 (1994).

"Photoreduction of iron oxyhydroxides in the presence of important atmospheric organic compounds," Pehkonen S.O., Siefert R.L., Erel Y., Webb S. and Hoffmann M.R.,  Environ. Sci. & Technol. 27, 2056 -2062 (1993).

"Effect of nonthermally activated hopping on overlayer morphology - scanning-tunneling-microscopy study of Ti/GaAs(110)," Yang Y.N., Trafas B.M., Luo Y.S., Siefert R.L. and Weaver J.H., Phys. Rev. B. 44 (11), 5720-5725 (1991).

"GaAs(110) terrace-width distributions and kink formation," Yang Y.N., Trafas B.M., Siefert R.L. and Weaver J.H., Phys. Rev. B. 44 (7), 3218-3221 (1991).

"Scanning tunneling microscopy of Ag growth on GaAs(110) at 300 K - from clusters to crystallites," Trafas B.M., Yang Y.N., Siefert R.L. and Weaver J.H., Phys. Rev. B. 43 (17), 14107-14114 (1991).

"Clustering and reaction for Cr/GaAs(110) - scanning tunneling microscopy and photoemission studies," Trafas B.M., Hill D.M., Benning P.J., Waddill G.D., Yang Y.N., Siefert R.L. and Weaver J.H., Phys. Rev. B. 43 (9), 7174-7184 (1991).

"Adsorption and interaction of Sm on GaAs(110) studied by scanning tunneling microscopy," Trafas B.M., Hill D.M., Siefert R.L. and Weaver J.H., Phys. Rev. B. 42 (5), 3231-3234 (1990).

"CdTe(110) interface formation with reactive and nonreactive overlayers - Al, Ti, Pd, Ag, Au, In, and Ce," Trafas B.M., Meyer H.M., Aldao C.M., Siefert R.L., Vos M. and Weaver J.H., J. Vac. Sci. A. 8 (3), 2055-2061 (1990).        


“Development and application of a rapid and robust sensor to determine nitrogen species in the coastal atmosphere”, R. L. Siefert, J. E. Baker and A. K. Zander, Final Report submitted to the NOAA/UNH Cooperative Institute for Coastal and Estuarine Environmental Technology (CICEET), (2002). [UMCES Technical Series No. TS-381-02-CBL]

“Assessment of ammonia emissions and deposition from agricultural operations and urban areas in the Chesapeake Bay airshed”, R. L. Siefert, Final Report submitted to EPA (Chesapeake Bay Program), (2002). [UMCES Technical Series No. TS-XX-02-CBL]

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