Project TitleElectrochemical Removal of Dissolved Oxygen from Sample Streams (14066)
Track Code14066
Short Description



Features and Benefits

  • Highly efficient, simple operation provides a cost effective,calibration-free and low power system with no stored chemicalreagents or gases for DO removal (only requires sample inlet/outletand a DC power source – e.g., battery or super-capacitorreplenished by solar panel for continuous use)
  • Compatible with deployment of numerous dissolved oxygen (DO)removing modules, e.g., remote automated sensing networks andother high volume applications
  • Readily scalable (i.e., further miniaturization and/or use of multiple(flow) stages) with Lab on Chip (LOC) integration potential
  • Operating principle is readily adaptable to other electrochemically active dissolved gases and/or non-aqueous fluids or fluid mixtures      


*This technology is available for licensing, further development, and/or industrial partnering*




Water quality monitoring for heavy metal contaminants generally relies on analytical snapshots at a particular time and place that may not be representative of the overall system. Anodic stripping coulometry analyzes the presence of metals or other contaminants in a sample, but O2 reduction interferes with the stripping analysis for more negatively reduced metals. Thus, most electroanalysis techniques rely on pretreatments to remove dissolved oxygen (DO) from the sample prior to analysis. Some current approaches to DO removal require application of a vacuum or purging with an inert gas, which can alter the sample pH. Other known approaches require exposure to oxygen scavengers that potentially alter the metal speciation of a sample and fail to identify contaminants. For this particular application and others where continuous DO removal is desirable, there exists a need for a remote technology that is capable of removing DO from a sample stream prior to sample analysis with minimal chemical or physical alterations to the sample. University of Louisville researchers are developing such a technology that accomplishes these aims by way of passive diffusion across an oxygen permeable membrane into a deoxygenation chamber. Initial testing has shown removal of 98% of DO in test samples at flow rates approaching 50 μL/min and power consumption as low as 165 mW hr L-1 at steady state.



Markets Addressed

  • Removal of dissolved oxygen (DO) for stripping analysis of metals where oxygen interferes (Pb, Cd)
  • Upstream removal and regulation of DO in a variety of Lab on Chip (LOC) systems, such as in water qualitysampling and monitoring, minimization of photobleaching in fluorescence imaging, etc.
  • Removal of DO to reduce background current in electrochemical cathodic detection, e.g., capillary electrophoresis
  • DO concentration control module upstream of microfluidic cell cultures
  • Micro-reactors where DO is detrimental to the reaction, e.g., hydrogenase enzyme based micro-reactors


Technology Status

  • IP Status: Patent pending
  • Development Status: Prototype designed, fabricated, and successful operation demonstrated
  • Fields of Use Available: All
  • Publications: Marei, Mohamed M., 2014, “Electrochemical and microfabrication strategies for remotely operatedheavy metal sensor networks for water analysis: The dual challenges of calibration-less measurement andsample pretreatment,” PhD dissertation, University of Louisville, available at (accessed April 7, 2015): and M.M. Marei, T.J. Roussel, R.S.Keynton, R.P. Baldwin. Electrochemical Dissolved Oxygen Removal from Microfluidic Streams for LOC SamplePretreatment. Analytical Chemistry 86 (2014) 8541-8546.
Posted DateNov 10, 2014 1:34 PM


Richard Baldwin
Thomas Roussel
Robert Keynton
Mohamed Marei


File Name Description
14066 Marketing Abstract Marketing abstract for 14066 in .pdf Download
Figure 1: Image.png Schematic representation of electrochemical dissolved oxygen removal (EDOR) device. Download
UL_photo.png University of Louisville mark - protected. Download