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 Staff

Name and Contact Information Research Interests
Recent Projects and Publications
Christina Bennett-Stamper
Physical Scientist
WSWRD, TTEB
513-569-7010

 

Materials and biological scanning electron microscopy

Materials and biological transmission electron microscopy

Energy dispersive spectrometry (EDS)

Wavelength dispersive spectrometry (WDS)

Epi-fluorescent and laser scanning confocal microscopy

Specialized sample preparation techniques used in biological and materials analysis as they apply to water quality, corrosion, biofilm, nanotechnology, and cell biology research at EPA

 
Michael Gonzalez
Chemist
STD, SAB
513-569-7624
Green chemistry and engineering

Process intensification

 
Stephen Harmon
Environmental Scientist
SWSRD
513-569-7184
Scanning electron microscopy energy dispersive X-ray analyses (SEM EDXA)

Transmission electron microscopy EDXA and powdered X-ray fluorescence (PXRF)

X-ray fluorescence (XRF)

Characterizing a wide range of solids (nanomaterials, corrosion products, sludges, biofilms) encountered in drinking water and wastewater research

Schock, M., D. Lytle, A. Sandvig, et al. (2005). “Replacing Polyphosphate With Silicate to Solve Lead, Copper, and Source Water Iron Problems.” Journal AWWA, 97, 11: 84–93.

Schock, M., S. Harmon, J. Swertfeger, et al. (2001). “Tetravalent Lead: A Hitherto Unrecognized Control of Tap Water Lead Contamination.” In: Proceedings AWWA Water Quality Technology Conference, Nashville, TN, November 11–14.

Speth, T., C. Parrett, S. Harmon, and K. Kelty. (2001). “Effect of Chloramination and Seasonal Water Changes on Nanofiltration Fouling.” In: Proceedings AWWA Membrane Technology Conference, San Antonio, TX, March 4–7.

Harmon, S. (2000). “The Theory of Energy Dispersive X-Ray Analysis via Scanning Electron Microscopy and Subsequent Elemental Analysis of Lead Service Lines.” Presentation, Cincinnati Water Works in-house training program, July.

Harmon, S. (1999). “The Effects of Polyphosphate Sequestration on Plumbosolvency as Experienced by the Water Utility of Hopkinton, MA.” In: Proceedings AWWA Water Quality Technology Conference, Tampa, FL.

Schock, M., J. Clement, D. Lytle, et al. (1998). “Replacing Polyphosphate With Silicate to Solve Problems With Lead, Copper, and Source Water Iron.” In: Proceedings AWWA Water Quality Technology Conference, San Diego, CA.

Darren A. Lytle
Environmental Engineer
SWSRD, TTEB
513-569-7432
Impact of water quality variables on copper, lead, and iron particles and corrosion

Impact of water chemistry on localized copper corrosion

Contaminant accumulation in drinking water distribution systems

Microbiological treatment strategies for ammonia oxidation

Mechanisms of iron corrosion control

 
Christopher J. Parrett
Environmental Technician
TTEB
513-569-7033
Removal of organic contaminants from drinking water

Candidate Contaminant List compounds and their removal from drinking water

Membrane filtration technologies

Water treatment technologies including membrane filtration, activated carbon, air stripping riverbank filtration, and ion exchange softening

Schenck, K., T. Speth, C. Parrett, et al. (2004). “Evaluation of Drinking Water Treatment Technologies for Removal of Endocrine-Disrupting Chemicals.” Presentation, Japan/U.S. Conference on Drinking Water Quality Management and Wastewater Control, Oahu, HI, July.

Schenck, K., T. Speth, C. Parrett, et al. (2004). “Evaluation of the Removal of Ethynylestradiol by Granular Activated Carbon Treatment.” Presentation, Annual Meeting of the Society of Environmental Toxicology and Chemistry. Portland, OR, November.

Speth, T., C. Parrett, S. Harmon, and K. Kelty. (2002). “Effects of Chloramination and Site-Specific Issues on Nanofiltration Flux Loss and Foulant Characteristics.” J. Environ. Eng. Science, 1, 15: 371–381.

Endalkachew Sahle-Demessie
Chemical Engineer
STE, CPB
513-569-7739
Nanomaterial characterization

Life cycle of nanomaterials in the environment

 
Michael R. Schock
Chemist
SWSRD, TTEB
513-569-7412
Corrosion of water distribution system materials

Analytical methodologies for corrosion scale and drinking water solids analysis

Evaluation of water treatment processes to meet regulatory compliance goals

Geochemical and chemical modeling of water systems

Equilibrium chemistry and transport of corrosion by-product metals

Schock, M. and T. Holm. (2003). “Are We Monitoring in the Right Places for Metals and Radionuclides?” Jour. New England Water Works Association, 141, 2: 102.

Snoeyink, V., M. Schock, P. Sarin, et al. (2003). “Aluminum- Containing Scales in Water Distribution Systems: Prevalence and Composition.” J. Water SRT-Aqua, 52, 7: 455.

Schock, M., T. Lovejoy, J. Holldber, and J. Lowry. (2002). “California’s First Aeration Plants for Corrosion Control.” Jour. AWWA, 94, 3: 88–100.

Schock, M. (1999). “Internal Corrosion and Deposition Control.” Chapter 17 in Water Quality and Treatment, 5th ed. American Water Works Association, McGraw Hill.

Edwards, M., M. Schock, and T. Meyer. (1996). “Alkalinity pH and Copper Corrosion By-Product Releases.” Jour. AWWA, 88, 3: 81.

Schock, M., I. Wagner, and R. Oliphant. (1996). “The Corrosion and Solubility of Lead in Drinking Water.” Chapter 4 in Internal Corrosion of Water Distribution Systems, 2nd ed. American Water Works Association Research Foundation/DVGW-TZW Cooperative Research Report.

Schock, M. D. Lytle, and J. Clement. Effect of pH, DIC, and Orthophosphate on Sulfate on Drinking Water Cuprosolvency (EPA/600/R-95/085) June 1995

Rajender Varma
Chemist
STD, CPB
513-487-2701
Synthesis of green nanomaterials  
Douglas Young
Chemical Engineer
STD, CPB
513-569-7624
   
David Carson
Environmental Engineer
LRPCD, WMB
513-569-7527
Materials management, waste management, nanomaterials characterization, and transport and fate  
Derrick Allen
Physical Science Laboratory Technician
LRPCD, WMB
513-487-2862
Materials management, waste management, nanomaterials characterization, and transport and fate  
Souhail Al-Abed
Chemist
LRPCD, WMB
513-569-7849
Materials management, waste management, nanomaterials characterization, transport and fate, bioavailability, and metals speciation  
Kirk Scheckel
Soil Scientist
LRPCD, WMB
513-487-2865
Materials management, waste management, nanomaterials characterization, transport and fate, bioavailability, and metals speciation  
Thabet Tolyamat
Environmental Engineer
LRPCD, WMB
513-487-2860
Materials management, waste management, nanomaterials characterization, transport and fate, bioavailability, and metals speciation  
Todd Luxton
Environmental Chemist
Federal Post-Doctoral Fellow
LRPCD, WMB
513-569-7210
Materials management, waste management, nanomaterials characterization, transport and fate, bioavailability, and metals speciation  

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