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Accelerating (1)H NMR Detection of Aqueous Ammonia

[Image: see text] Direct electrolytic N(2) reduction to ammonia (NH(3)) is a renewable alternative to the Haber–Bosch process. The activity and selectivity of electrocatalysts are evaluated by measuring the amount of NH(3) in the electrolyte. Quantitative (1)H nuclear magnetic resonance (qNMR) detec...

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Autores principales: Kolen, Martin, Smith, Wilson A., Mulder, Fokko M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2021
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7931439/
https://www.ncbi.nlm.nih.gov/pubmed/33681609
http://dx.doi.org/10.1021/acsomega.0c06130
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author Kolen, Martin
Smith, Wilson A.
Mulder, Fokko M.
author_facet Kolen, Martin
Smith, Wilson A.
Mulder, Fokko M.
author_sort Kolen, Martin
collection PubMed
description [Image: see text] Direct electrolytic N(2) reduction to ammonia (NH(3)) is a renewable alternative to the Haber–Bosch process. The activity and selectivity of electrocatalysts are evaluated by measuring the amount of NH(3) in the electrolyte. Quantitative (1)H nuclear magnetic resonance (qNMR) detection reduces the bench time to analyze samples of NH(3) (present in the assay as NH(4)(+)) compared to conventional spectrophotometric methods. However, many groups do not have access to an NMR spectrometer with sufficiently high sensitivity. We report that by adding 1 mM paramagnetic Gd(3+) ions to the NMR sample, the required analysis time can be reduced by an order of magnitude such that fast NH(4)(+) detection becomes accessible with a standard NMR spectrometer. Accurate, internally calibrated quantification is possible over a wide pH range.
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spelling pubmed-79314392021-03-05 Accelerating (1)H NMR Detection of Aqueous Ammonia Kolen, Martin Smith, Wilson A. Mulder, Fokko M. ACS Omega [Image: see text] Direct electrolytic N(2) reduction to ammonia (NH(3)) is a renewable alternative to the Haber–Bosch process. The activity and selectivity of electrocatalysts are evaluated by measuring the amount of NH(3) in the electrolyte. Quantitative (1)H nuclear magnetic resonance (qNMR) detection reduces the bench time to analyze samples of NH(3) (present in the assay as NH(4)(+)) compared to conventional spectrophotometric methods. However, many groups do not have access to an NMR spectrometer with sufficiently high sensitivity. We report that by adding 1 mM paramagnetic Gd(3+) ions to the NMR sample, the required analysis time can be reduced by an order of magnitude such that fast NH(4)(+) detection becomes accessible with a standard NMR spectrometer. Accurate, internally calibrated quantification is possible over a wide pH range. American Chemical Society 2021-02-19 /pmc/articles/PMC7931439/ /pubmed/33681609 http://dx.doi.org/10.1021/acsomega.0c06130 Text en © 2021 The Authors. Published by American Chemical Society This is an open access article published under an ACS AuthorChoice License (https://creativecommons.org/licenses/by-nc-nd/4.0/) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Kolen, Martin
Smith, Wilson A.
Mulder, Fokko M.
Accelerating (1)H NMR Detection of Aqueous Ammonia
title Accelerating (1)H NMR Detection of Aqueous Ammonia
title_full Accelerating (1)H NMR Detection of Aqueous Ammonia
title_fullStr Accelerating (1)H NMR Detection of Aqueous Ammonia
title_full_unstemmed Accelerating (1)H NMR Detection of Aqueous Ammonia
title_short Accelerating (1)H NMR Detection of Aqueous Ammonia
title_sort accelerating (1)h nmr detection of aqueous ammonia
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7931439/
https://www.ncbi.nlm.nih.gov/pubmed/33681609
http://dx.doi.org/10.1021/acsomega.0c06130
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