Method for measuring the concentration or partial pressure of oxygen

• US 4,994,396 A
• Filed: 12/14/1987
• Issued: 02/19/1991
• Est. Priority Date: 12/14/1987
• Status: Expired due to Fees

• Current Assignee: The Dow Chemical Company (Dow, Inc.)
• Original Assignee: The Dow Chemical Company (Dow, Inc.)
• Inventors: Lefkowitz, Steven M., Paquette, Michael S., Webb, Steven P.
• Primary Examiner(s): Warden, Robert J.
• Assistant Examiner(s): McMahon, Timothy M.
• Application Number:
  US07/133,594
• Time in Patent Office: 1,163 Days
• Field of Search: 422/91, 422/52, 250/458.1, 250/459.1, 350/96.34, 356/41, 436/127, 436/136, 436/172, 436/800, 128/633, 128/634, 128/635, 128/664, 128/665, 128/666
• US Class Current: 436/136
• CPC Class Codes: G01N 2021/6434 Optrodes
• CPC Class Codes: G01N 2021/772 Tip coated light guide
• CPC Class Codes: G01N 2021/7786 Fluorescence
• CPC Class Codes: G01N 21/643 non-biological material
• CPC Class Codes: G01N 21/7703 using reagent-clad optical fibres or optical waveguides using measurement of total internal reflection or attenuated total reflection G01N21/552; optical fibres or waveguides per se G02B
• CPC Class Codes: Y10S 436/80 Fluorescent dyes, e.g. rhodamine
• CPC Class Codes: Y10T 436/20 Oxygen containing
• CPC Class Codes: Y10T 436/207497 Molecular oxygen

Abstract

A sensor and a method for determining the concentration or the partial pressure of oxygen comprising:

(a) means for transmitting and collecting light to and from a light modifying medium; and

(b) a light modifying medium containing a luminescent dye dispersed in or upon a matrix and the dye is accessible to oxygen, wherein said luminescent dye contains a hexanuclear core of molybdenum, tungsten or mixtures thereof having 14 coordination sites, wherein each coordination site is occupied by a ligand.

Claims

1. A method for determining the concentration or the partial pressure of oxygen in media, comprising:

(A) inserting a sensor into the media, wherein the sensor comprises;

(a) means for transmitting and collecting light to and from a light modifying medium; and

(b) a light modifying medium comprising a luminescent dye dispersed in or upon a matrix and the dye is accessible to oxygen;

wherein said luminescent dye contains a hexanuclear core of molybdenum, tungsten or mixtures thereof having 14 coordination sites, wherein each coordination site is occupied by a ligand;

(B) transmitting and collecting light to and from said light modifying medium;

(C) measuring the intensity of luminescence collected from the light modifying medium and relating the measured intensity to a known standard to determine the concentration or partial pressure of oxygen present in the media.

2. The method of claim 1 wherein the means for transmitting and collecting light is an optical waveguide.

3. The method of claim 2 wherein the optical waveguide is an optical fiber.

4. The method of claim 1 wherein the matrix is a polymeric material.

5. The method of claim 1 wherein the matrix is an organic polymeric material.

6. The method of claim 1 wherein the matrix is polymethylmethacrylate (PMMA).

7. The method of claim 1 wherein the matrix is an organic polymer admixed with a plasticizer.

8. The method of claim 1 wherein the matrix is polymethylmethacrylate admixed with 2-ethylhexyl diphenyl phosphate (EDPP).

9. The method of claim 1 wherein the luminescent dye contains a hexanuclear core of molybdenum.

10. The method of claim 1 wherein the luminescent dye contains a hexanuclear core of tungsten.

11. The method of claim 1 wherein the ligand is halide.

12. The method of claim 1 wherein the ligand is bromo.

13. The method of claim 1 wherein the ligand is iodo.

14. The method of claim 1 wherein the luminescent dye is Mo₆ Br₁₄.sup.⊖

⊖

.

15. The method of claim 1 wherein the net electronic charge of luminescent dye is zero or neutral.

16. The method of claim 1 wherein the net electronic charge of the luminescent dye is greater than zero or positive.

17. The method of claim 16 wherein the positively charged luminescent dye is balanced by a counterion.

18. The method of claim 1 wherein the net electronic charge of the luminescent dye is less than zero or negative.

19. The method of claim 18 wherein the negatively charged luminescent dye is balanced by a counterion.

20. The method of claim 19 wherein the counterion is tetrabutyl ammonium.

21. The method of claim 19 wherein the luminescent dye is Mo₆ Br₁₄.sup.⊖

⊖ and

the counterion is tetrabutyl ammonium.