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Simultaneous Gas-phase Detection of Nitric Oxide (NO) and Nitrous Oxide (N₂O) from the Decomposition of Angeli's Salt (Na₂N₂O₃) at Different pHs Using Tunable-diode Laser Absorption Spectroscopy

^aDepartment of Chemistry and Biochemistry, University of Oklahoma, 620 Parrington Oval, Norman, Oklahoma, U.S.A., 73019

^bEkips Technologies Inc., 710 Asp Avenue, Norman, OK, 73069

^cSchool of Electrical and Computer Engineering, University of Oklahoma, 202 West Boyd St., Norman, Oklahoma, U.S.A., 73019

*Corresponding author:

George B. Richter-Addo

Tel.: +1 405 325 6401; fax: +1 405 325 6111.

E-mail address: grichteraddo@ou.edu

Abstract

Nitric oxide (NO) is a gaseous diatomic molecule that is biosynthesized in mammals, and it regulates a host of physiological processes including blood pressure. Over the last several years, there has been an increased interest in the redox partner HNO and its identifiable dimerization product N₂O. This latter gaseous species is also the product of various NO-coupling reactions as occurs in bacterial NO-detoxification processes. An attractive new tool will be the ability to simultaneously detect NO and N₂O from the same reaction vessel. We demonstrate proof-of-concept methodology for such a simultaneous and specific NO and N₂O detection from the same precursor (from Angeli's salt decomposition) using tunable diode laser absorption spectroscopy without the need for separation or pretreatment of these gases.

Keywords: Nitric oxide; Nitrous oxide; detection; TDLAS; Angeli's salt

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