Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry

Abstract Effects of dissolved paramagnetic oxygen (O2) in water on 1H nuclear magnetic resonance (NMR) Carr-Purcell-Meiboom-Gill (CPMG) experiments is evaluated at a 1H Larmor frequency of 2 MHz. Dissolution of O2 into water significantly reduces the 1H transverse relaxation coefficient (T2). For de...

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Autores principales:	Kurt Livo, Manika Prasad, Trent R. Graham
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9436d3d1f315406f9b8f333f31d6e35c
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spelling	oai:doaj.org-article:9436d3d1f315406f9b8f333f31d6e35c2021-12-02T15:22:57ZQuantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry10.1038/s41598-020-79441-52045-2322https://doaj.org/article/9436d3d1f315406f9b8f333f31d6e35c2021-01-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-79441-5https://doaj.org/toc/2045-2322Abstract Effects of dissolved paramagnetic oxygen (O2) in water on 1H nuclear magnetic resonance (NMR) Carr-Purcell-Meiboom-Gill (CPMG) experiments is evaluated at a 1H Larmor frequency of 2 MHz. Dissolution of O2 into water significantly reduces the 1H transverse relaxation coefficient (T2). For deoxygenated water, T2 is 3388 ms, water at ambient atmospheric conditions (7.4 mg/L O2) exhibits a T2 of 2465 ms, and dissolution of 2710 mg/L O2 further reduces T2 to 36 ms. The results were fit with an empirical model to facilitate prediction of T2 times for bulk water as a function of paramagnetic oxygen concentrations in solution. Dissolved O2 also greatly influences 1H NMR CPMG experiments of confined water in a model system composed of Berea sandstone. For this system, 90 mg/L O2 in H2O enhances T2 relaxation of bulk water such that the relaxation time is comparable to physically confined water in the sandstone pores. Given the sensitivity of NMR T2 coefficients to paramagnetic oxygen, low-field NMR-based characterization of fluid and porous media structure requires control of dissolved oxygen, as geospatial variation in the partial pressure of O2 alone is expected to perturb fluid and pore relaxation times by up to 60 and 36%, respectively.Kurt LivoManika PrasadTrent R. GrahamNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kurt Livo Manika Prasad Trent R. Graham Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
description	Abstract Effects of dissolved paramagnetic oxygen (O2) in water on 1H nuclear magnetic resonance (NMR) Carr-Purcell-Meiboom-Gill (CPMG) experiments is evaluated at a 1H Larmor frequency of 2 MHz. Dissolution of O2 into water significantly reduces the 1H transverse relaxation coefficient (T2). For deoxygenated water, T2 is 3388 ms, water at ambient atmospheric conditions (7.4 mg/L O2) exhibits a T2 of 2465 ms, and dissolution of 2710 mg/L O2 further reduces T2 to 36 ms. The results were fit with an empirical model to facilitate prediction of T2 times for bulk water as a function of paramagnetic oxygen concentrations in solution. Dissolved O2 also greatly influences 1H NMR CPMG experiments of confined water in a model system composed of Berea sandstone. For this system, 90 mg/L O2 in H2O enhances T2 relaxation of bulk water such that the relaxation time is comparable to physically confined water in the sandstone pores. Given the sensitivity of NMR T2 coefficients to paramagnetic oxygen, low-field NMR-based characterization of fluid and porous media structure requires control of dissolved oxygen, as geospatial variation in the partial pressure of O2 alone is expected to perturb fluid and pore relaxation times by up to 60 and 36%, respectively.
format	article
author	Kurt Livo Manika Prasad Trent R. Graham
author_facet	Kurt Livo Manika Prasad Trent R. Graham
author_sort	Kurt Livo
title	Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
title_short	Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
title_full	Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
title_fullStr	Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
title_full_unstemmed	Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry
title_sort	quantification of dissolved o2 in bulk aqueous solutions and porous media using nmr relaxometry
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9436d3d1f315406f9b8f333f31d6e35c
work_keys_str_mv	AT kurtlivo quantificationofdissolvedo2inbulkaqueoussolutionsandporousmediausingnmrrelaxometry AT manikaprasad quantificationofdissolvedo2inbulkaqueoussolutionsandporousmediausingnmrrelaxometry AT trentrgraham quantificationofdissolvedo2inbulkaqueoussolutionsandporousmediausingnmrrelaxometry
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Quantification of dissolved O2 in bulk aqueous solutions and porous media using NMR relaxometry

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