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Aperture Size Influences Oxidation in Positive-Ion Nitrogen Direct Analysis in Real Time Mass Spectrometry.
J Am Soc Mass Spectrom
July 2022
JEOL USA Inc 11 Dearborn Road, Peabody, Massachusetts 01960, United States.
Direct Analysis in Real Time (DART) mass spectrometry commonly uses helium as the DART gas. With the looming helium shortage, other gases are being evaluated for DART. Nitrogen is inexpensive and readily available, making it a desirable alternative.
View Article and Find Full Text PDFCorrection of sensor crosstalk error in Exhalyzer D multiple-breath washout device significantly impacts outcomes in children with cystic fibrosis.
J Appl Physiol (1985)
September 2021
Division of Paediatric Respiratory Medicine and Allergology, Department of Paediatrics, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland.
Nitrogen multiple-breath washout is an established technique to assess functional residual capacity and ventilation inhomogeneity in the lung. Accurate measurement of gas concentrations is essential for the appropriate calculation of clinical outcomes. We investigated the accuracy of oxygen and carbon dioxide gas sensor measurements used for the indirect calculation of nitrogen concentration in a commercial multiple-breath washout device (Exhalyzer D, Eco Medics AG, Duernten, Switzerland) and its impact on functional residual capacity and lung clearance index.
View Article and Find Full Text PDFGas-diffusion-electrode based direct electro-stripping system for gaseous ammonia recovery from livestock wastewater.
Water Res
May 2021
Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 305-338, Republic of Korea. Electronic address:
Livestock wastewater (LW) typically contains a substantial amount of NH that can potentially be recovered and used in fertilizers or chemicals. In an attempt to recover NH from LW, a novel electrochemical approach using a gas diffusion electrode (GDE) was developed and its efficacy was demonstrated in this study. The GDE-based electrochemical device, when operated at an air-flow rate of 20 mL/min, was free of back-diffusion flux, which is a fatal drawback of any membrane-based NH separation approach.
View Article and Find Full Text PDFDifference between SF and N multiple breath washout kinetics is due to N back diffusion and error in N offset.
J Appl Physiol (1985)
October 2018
Division of Pulmonary Medicine, Allergy & Immunology, Department of Pediatrics, University of Pittsburgh, Pittsburgh, Pennsylvania.
Measurement of lung clearance index (LCI) by multiple breath washout (MBW) is a sensitive method for monitoring lung disease in patients with cystic fibrosis (CF). To compare nitrogen MBW (N-MBW) and sulfur hexafluoride MBW (SF-MBW), we connected these two gas analysis systems in series to obtain truly simultaneous measurements, with no differences other than the gas used. Nonsmoking healthy controls (HC) and subjects with CF were recruited at two institutions.
View Article and Find Full Text PDFNitrogen back-diffusion during multiple-breath washout with 100% oxygen.
Eur Respir J
September 2017
Dept of Pediatrics, University of Pittsburgh, Pittsburgh, PA, USA
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