Chemistry: analytical and immunological testing – Nitrogen containing – Oxides of nitrogen
Patent
1994-06-20
1996-05-07
Redding, David A.
Chemistry: analytical and immunological testing
Nitrogen containing
Oxides of nitrogen
436117, G01N 3300
Patent
active
055145949
ABSTRACT:
The present invention relates to a method and a device for the measurement of NO contents in liquids using an inert carder gas. The device consists of a micro reaction part FIG. 1 which is divided into an inert gas inlet nozzle 1, the microreaction vessel 2 with frit 3, at least one inlet nozzle for the injection of the liquid to be analyzed 4, as well as a cooled outlet nozzle for the inert gas loaded with NO 5, and a detector 6, with which the NO content of the inset liquid is measured and evaluated, and where the NO.sub.2 - ions present in the solution are reduced back to NO using a reaction mixture consisting out of 1,1'-dimethylferrocene in acetonitrile in an acidic medium, preferably perchloric acid.
REFERENCES:
Peter Mordvintcev, et al., "On Line Detection of Nitric Oxide Formation in Liquid Aqueous Phase by Electron Paramagnetic Resonance Spectroscopy," Analytical Biochemistry 199, 142 146 (1991).
Mark Bollinger and Robert E. Sievers, "Conversion of Nitrogen Dioxide, Nitric Acid, and n-Propyl Nitrate to Nitric Oxide by Gold-Catalyzed Reduction with Carbon Monoxide" Anal. Chem. 1983, 55, 1980-1986.
Oliver C. Zafiriou and Mack McFarland, "Determination of Trace Levels of Nitric Oxide in Aqueous Solution", Anal. Chem. 1980, 52, 1662-1667.
Chemical Abstracts, vol. 113, (16), 1990, Ref.: 139557g.
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