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Title: Response-surface fits and calibration transfer for the correction of the oxygen effect in the quantification of carbon dioxide via FTIR spectroscopy

Authors:
; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1415898
Grant/Contract Number:
AC52-07NA27344; B598643; B60301
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Analytica Chimica Acta
Additional Journal Information:
Journal Volume: 972; Journal Issue: C; Related Information: CHORUS Timestamp: 2018-01-05 16:13:33; Journal ID: ISSN 0003-2670
Publisher:
Elsevier
Country of Publication:
Netherlands
Language:
English

Citation Formats

Seichter, Felicia, Vogt, Josef, Radermacher, Peter, and Mizaikoff, Boris. Response-surface fits and calibration transfer for the correction of the oxygen effect in the quantification of carbon dioxide via FTIR spectroscopy. Netherlands: N. p., 2017. Web. doi:10.1016/j.aca.2017.03.053.
Seichter, Felicia, Vogt, Josef, Radermacher, Peter, & Mizaikoff, Boris. Response-surface fits and calibration transfer for the correction of the oxygen effect in the quantification of carbon dioxide via FTIR spectroscopy. Netherlands. doi:10.1016/j.aca.2017.03.053.
Seichter, Felicia, Vogt, Josef, Radermacher, Peter, and Mizaikoff, Boris. Thu . "Response-surface fits and calibration transfer for the correction of the oxygen effect in the quantification of carbon dioxide via FTIR spectroscopy". Netherlands. doi:10.1016/j.aca.2017.03.053.
@article{osti_1415898,
title = {Response-surface fits and calibration transfer for the correction of the oxygen effect in the quantification of carbon dioxide via FTIR spectroscopy},
author = {Seichter, Felicia and Vogt, Josef and Radermacher, Peter and Mizaikoff, Boris},
abstractNote = {},
doi = {10.1016/j.aca.2017.03.053},
journal = {Analytica Chimica Acta},
number = C,
volume = 972,
place = {Netherlands},
year = {Thu Jun 01 00:00:00 EDT 2017},
month = {Thu Jun 01 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.aca.2017.03.053

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  • In situ Fourier transform infrared-diffuse reflection spectroscopy is introduced as a method for studying the catalytic surfaces of membrane electrode assemblies in working fuel cells. An annular collection electrode and a CaF{sub 2} window are used to expose a sufficient area of the electrode to the IR beam. Experimental results for methanol oxidation, CO adsorption, and (CO{sub 2} + CO) adsorption show that this method can be used to monitor the catalyst surface in a direct methanol fuel cell under load. The IR peaks associated with CO adsorption on high surface area Pt-Ru are similar to previously observed peaks onmore » smooth electrodes reported in the literature.« less
  • The chemisorption of CO and hydrogenation of surface adsorbed carbon species formed after reaction of CO/He with Rh/MgO catalyst in the range 300-573 K were studied by transient methods employing both FTIR and mass spectroscopy in separate flow and reactor systems. Exposure of Rh/MgO to CO/He at 523 K results in a rapid formation of linear and bridged CO species. It was found that formation of gem-dicarbonyl CO species during CO chemisorption at 300 K is strongly affected by CO/He treatment at 523 K and H[sub 2] reduction conditions. Experiments with labelled CO ([sup 13]CO and C[sup 18]O) indicate thatmore » linear and bridged CO species readily exchange with gaseous CO species. Transient hydrogenation results for adsorbed carbon-containing species formed after CO/He reaction at 523 K provide evidence that H[sub 2] chemisorption decreases after cycles of reaction in CO/He at 523 K followed by H[sub 2] reduction at 673 K. However, the surface coverages of adsorbed CO species are not affected by such treatments. Oxygen pretreatment of the catalyst at 623 K followed by H[sub 2] reduction, after CO/He reaction at 523 K, greatly affects the transient kinetics of hydrogenation of adsorbed CO species at 523 K but not their respective surface coverages. This result is related to a change in the hydrogen chemisorption sites by oxygen treatment which resulted in the removal of inactive carbon not hydrogenated at 723 K. A kinetic model for the hydrogenation of the various adsorbed carbon-containing species is proposed which accounts for the interpretation of the CH[sub 4] transient responses obtained. 46 refs., 13 figs.« less
  • Oxygen-15-labeled water is a diffusible, metabolically inert myocardial blood flow tracer with a short half-life (2 minutes) that can be used quantitatively with positron emission tomography (PET). The purpose of this study was to validate a new technique to quantify myocardial blood flow (MBF) in animals and to assess its application in patients. The technique involves the administration of 15O-labeled carbon dioxide (C15O2) and rapid dynamic scanning. Arterial and myocardial time activity curves were fitted to a single tissue compartment tracer kinetic model to estimate MBF in each myocardial region. Validation studies consisted of 52 simultaneous measurements of MBF withmore » PET and gamma-labeled microspheres in nine closed-chest dogs over a flow range of 0.5-6.1 ml/g/min. A good correlation between the two methods was obtained (y = 0.36 + 1.0x, r = 0.91). Human studies consisted of 11 normal volunteers and eight patients with chronic stable angina and single-vessel disease, before and after intravenous dipyridamole infusion. In the normal group, MBF was homogeneous throughout the left ventricle both at rest and after administration of dipyridamole (0.88 +/- 0.08 ml/g/min and 3.52 +/- 1.12 ml/g/min, respectively; p less than or equal to 0.001). In patients, resting MBF was similar in the distribution of the normal and stenotic arteries (1.03 +/- 0.23 and 0.93 +/- 0.21 ml/g/min, respectively). After dipyridamole infusion, MBF in normally perfused areas increased to 2.86 +/- 0.83 ml/g/min, whereas in the regions supplied by stenotic arteries it increased to only 1.32 +/- 0.27 ml/g/min (p less than or equal to 0.001). PET with C15O2 inhalation provides an accurate noninvasive quantitative method for measuring regional myocardial blood flow in patients.« less
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