NDLI: Infrared spectroscopic methods for the study of aerosol particles using White cell optics: Development and characterization of a new aerosol flow tube.

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Infrared spectroscopic methods for the study of aerosol particles using White cell optics: Development and characterization of a new aerosol flow tube.

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Infrared spectroscopic methods for the study of aerosol particles using White cell optics: Development and characterization of a new aerosol flow tube.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Nájera, Juan J. Fochesatto, Javier G. Horn, Andrew B. Last, Deborah J. Percival, Carl J.
Description	Country affiliation: United kingdom Author Affiliation: Nájera JJ ( School of Earth, Atmospheric, and Environmental Sciences, Faculty of Engineering and Physical Sciences, The University of Manchester, Oxford Road, M13 9PL Manchester, United Kingdom.)
Abstract	A description of a new aerosol flow tube apparatus for measurements in situ under atmospherically relevant conditions is presented here. The system consists of a laboratory-made nebulizer generation system and a flow tube with a White cell-based Fourier transform IR for the detection system. An assessment of the White cell coupled to the flow tube was carried out by an extensive set of experiments to ensure the alignment of the infrared beam and optimize the performance of this system. The detection limit for CO was established as (1.0+/-0.3) ppm and 16 passes was chosen as the optimum number of passes to be used in flow tube experiments. Infrared spectroscopy was used to characterize dry aerosol particles in the flow tube. Pure particles composed of ammonium sulfate or sodium chloride ranging between 0.8 and 2.1 mum for size diameter and (0.8-4.9)x10(6) particles/cm(3) for density number were generated by nebulization of aqueous solutions. Direct measurements of the aerosol particle size agree with size spectra retrieved from inversion of the extinction measurements using Mie calculations, where the difference residual value is in the order of 0.2%. The infrared detection limit for ammonium sulfate aerosol particles was determined as d(p)=0.9 mum and N=5x10(3) particles/cm(3) with sigma=1.1 by Mie calculation. Alternatively, Mie calculations were performed to determine the flexibility in varying the optical length when aerosol particles are sent by the injector. The very good agreement between the values retrieved for aerosol particles injected through the flow tube or through the injector clearly validates the estimation of the effective optical path length for the injector. To determine the flexibility in varying the reaction zone length, analysis of the extinction spectra as function of the position of the injector was carried out by monitoring the integrated area of different absorption modes of the ammonium sulfate. We conclude that the aerosol loss in the flow tube reactor is negligible and that the aerosol particles remain on-axis for the length of the flow tube.
ISSN	00346748
Issue Number	12
Volume Number	79
e-ISSN	10897623
Journal	Review of Scientific Instruments
Language	English
Publisher	American Institute of Physics
Publisher Date	2008-12-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Spectrophotometry, Infrared Instrumentation Methods Spectroscopy, Fourier Transform Infrared Aerosols Ammonium Sulfate Chemistry Calibration Equipment Design Kinetics Optics And Photonics Particle Size Pressure Sodium Chloride Temperature Journal Article Research Support, Non-u.s. Gov't Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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Infrared spectroscopic methods for the study of aerosol particles using White cell optics: Development and characterization of a new aerosol flow tube.