Polarographic instrument system for oxygen and hydrogen measurement

• US 8,702,925 B2
• Filed: 05/16/2011
• Issued: 04/22/2014
• Est. Priority Date: 05/14/2010
• Status: Expired due to Fees

• Current Assignee: Colorado School of Mines
• Original Assignee: Colorado School of Mines
• Inventors: Karns, Devin, Meuser, Jonathan, Posewitz, Matthew, Dempsey, Edward
• Primary Examiner(s): DIETERLE, JENNIFER M
• Application Number:
  US13/108,960
• Publication Number:
  US 20120085642A1
• Time in Patent Office: 1,072 Days
• Field of Search: 20440301-40315, 204/400, 204/450, 435/287.1, 422/68.1, 422/82.01
• US Class Current: 204/403.01
• CPC Class Codes: G01N 27/48 using polarography, i.e. measuring changes in current under a slowly-varying voltage

Abstract

A system for measuring hydrogen (H₂) and oxygen (O₂) including a sample system, a signal processing and system control device, at least one polarograph device and a computing device equipped with software for environmental and biological data analysis incorporating both user-defined and environmental data acquired by the signal processing and system control device. The system measures gas level or exchange (production and/or consumption) in the field or laboratory. In some embodiments, the system uses two Clark-type polarograph devices oppositely polarized with gas-specific polarographic circuits, wherein one polarograph device measures H₂ gas and the other measures O₂ gas. In some embodiments, the sample system includes an environmentally-controlled sample housing for accepting the polarograph devices and holding a test sample in a reservoir. The system measures H₂ or O₂ exchange in microbial samples, including microbial phototrophs which couple light harvesting to H₂ and/or O₂ exchange.

Claims

1. An oxygen and hydrogen measurement system comprising:

a polarograph system comprising;

a signal processing and system control device; and

a polarograph device communicatively coupled to the signal processing and system control device, the polarograph device comprising at least one probe configured to take biological H₂ or O₂ measurements, wherein a response of the at least one probe is processed based in part on feedback from environmental measurement of pressure, temperature and salinity;

a sample system comprising;

a sample housing for containing a photobiological, chemical, photochemical or biological redox reaction, the sample housing configured for receiving the at least one probe of the polarograph device; and

a computing device communicatively coupled to the polarograph system, the computing device comprising;

a processor; and

a memory communicatively coupled to the processor, the processor configured to execute instructions stored in the memory to compute oxygen and hydrogen measurements based on information received from at least the polarograph system.

2. The system of claim 1, wherein the sample housing is environmentally-controlled and gas impermeable.

3. The system of claim 1, wherein the signal processing and system control device dynamically modifies a polarization of the at least one probe.

4. The system of claim 1, wherein the system is portable.

5. The system of claim 1, further comprising a portable power source coupled to the system.

6. The system of claim 1, further comprising an optical system operably connected to the sample system and in electrical communication with the signal processing and system control device.

7. The system of claim 1, further comprising a water temperature control system.

8. The system of claim 7, wherein the water temperature control system further comprises a fan, a heat sink, a water temperature system, and a water block.

9. The system of claim 7, wherein the water temperature control system is peltier-controlled water temperature system.

10. The system of claim 1, wherein the at least one probe is a Clark-style electrode.

11. The system of claim 1, further comprising a single housing which encloses both the signal processing and system control device, and the sample system therein.

12. The system of claim 11, wherein the housing further comprises a wall configured to separate the signal processing and system control device and the sample system while allowing the device and sample system to remain coupled.

13. The system of claim 1, wherein the computing device further comprises an input/output device communicatively coupled to the processor and communicatively coupleable to a polarographic device to receive and transmit signals therebetween, the received signals being used by the processor to compute the oxygen and hydrogen measurements and the transmitted signals being used to control lighting, temperature, pressure or other operating parameters related to the photobiological, chemical, photochemical or biological redox reaction.

14. The system of claim 1, wherein the sample system further comprises a stir plate.

15. The system of claim 1, wherein the polarograph device is configured to receive, filter and amplify signals representative of a current generated in the at least one probe coupled to the device, when the at least one probe is coupled to the sample system and exposed to a photobiological, chemical, photochemical or biological redox reaction.

16. The system of claim 15, wherein the signal processing and system control device is configured to receive the filtered and amplified signals from the polarograph device and make the signals external to the polarograph system.

17. A polarograph system comprising:

a polarograph device comprising one or more probes and configured to receive, filter and amplify signals representative of a current generated in the one or more probes, wherein the one or more probes are coupled to a sample system and exposed to a photobiological, chemical, photochemical or biological redox reaction, wherein the one or more probes are configured to take biological H₂ or O₂ measurements, and wherein a response of the one or more probes is processed based in part on feedback from environmental measurements of pressure, temperature and salinity; and

a signal processing and system control device communicatively coupled to the polarograph device and configured to receive the filtered and amplified signals and make the signals external to the polarograph system.

18. The system of claim 17, wherein the one or more probes are configured to measure hydrogen in a first mode and oxygen in a second mode.

19. The system of claim 17, wherein the system comprises two probes and the probes are oppositely polarized.