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Aerosol Technology

by: Itzel Hilll

Aerosol Technology ENVR 416

Itzel Hilll
GPA 3.75

David Leith

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About this Document

David Leith
Class Notes
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This 3 page Class Notes was uploaded by Itzel Hilll on Sunday October 25, 2015. The Class Notes belongs to ENVR 416 at University of North Carolina - Chapel Hill taught by David Leith in Fall. Since its upload, it has received 31 views. For similar materials see /class/228869/envr-416-university-of-north-carolina-chapel-hill in Environment at University of North Carolina - Chapel Hill.

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Date Created: 10/25/15
AUTOMATIC coummc AND SIZING INSTRUMENTS Operatiun anemdynzmic sz39cle SizingInerumEnts APS and Aemsizer want new Parneles accelemle through the nozzle Smallerparncleshave llLLle henna and move Wlth the an Larger pamoles have more lnertla and accelemle through the nozzle more slowly A a result smallerparncles have ahlgher veloclty than largerpameles as they pass between the laser beams at the nozzle outlet Aaosol ow through the Aeroslzer The honzontal axls shows ameter othe test partlcles The vemeal axls shows partlele dlarneter as reported ansm39kfthmml b ll I m namlm was mum nut Manufacture callbratlon for the Aaoslza Desirable Characteristics Measure size correctly 7 we will check this aspect of performance Measure with constant counting efficiency 7 we will not check this aspect of performance Efficiency depends on factors that include PMT voltage cleanliness of the optics particle size particle type liquid or solid previous use of the instrument particle concentration Advantages and Limitations of the Aerosizer and the Aerodynamic Particle Sizer Advantages Counts particles quickly Measures particle size accurately in most cases Measures aerodynamic diameter Portable and can be used in the field Limitations Restricted to particles between 05 and 20 um APS Not good for size distributions Expensive 50000 Bulky fragile and difficult to use in the field Appropriate Uses for These Instruments Good when relative values of concentration are to be measured Not good when size distributions are to be measured because counting efficiency depends on many factors that cannot be controlled Examples of APS and Aerosizer Use Size distributions of outdoor air EPA Concentrations and size distributions for inhaled drugs FDA Filter efficiency GENERATION OF PSL TEST AEROSOLS Polystyrene latex psl spheres are in water With surfactant Cost is about 220bottle Put one or two drops of psl solution into distilled water in the nebulizer sump mm W anrxe wrav drawers vmpacr on wall and cum m turnaw 7 L m m we vgm closed Liquid mmw Comprzssnd air mm Characteristics of Aerosol Generation with Nebulizer Good for particles up to about 3 or 4 pm particles must be small enough to t into droplets Concentration of psl spheres must be low enough to prevent multiplets 7 doublets or tri lets Concentration of psl spheres must be high enough to have a high particle generation rate Surfactant in the psl solution dries to form residual particles and coats the psl particles Use the mode of the measured frequency distribution to characterize instrument performance frequency counts Particle diameter mode


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