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Method for sampling sub- micron particles

Patent ·
OSTI ID:6531418
;

Apparatus and method steps for collecting sub-micron sized particles include a collection chamber and cryogenic cooling. The cooling is accomplished by coil tubing carrying nitrogen in liquid form, with the liquid nitrogen changing to the gas phase before exiting from the collection chamber in the tubing. Standard filters are used to filter out particles of diameter greater than or equal to 0.3 microns; however the present invention is used to trap particles of less than 0.3 micron in diameter. A blower draws air to said collection chamber through a filter which filters particles with diameters greater than or equal to 0.3 micron. The air is then cryogenically cooled so that moisture and sub-micron sized particles in the air condense into ice on the coil. The coil is then heated so that the ice melts, and the liquid is then drawn off and passed through a Buchner funnel where the liquid is passed through a Nuclepore membrane. A vacuum draws the liquid through the Nuclepore membrane, with the Nuclepore membrane trapping sub-micron sized particles therein. The Nuclepore membrane is then covered on its top and bottom surfaces with sheets of Mylar R and the assembly is then crushed into a pellet. This effectively traps the sub-micron sized particles for later analysis.

Assignee:
The United States of America as represented by the United States Department of Energy
Patent Number(s):
US 4530250
OSTI ID:
6531418
Country of Publication:
United States
Language:
English

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Related Subjects

500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOL MONITORING
AIR FLOW
AIR POLLUTION
AIR POLLUTION MONITORING
AIR SAMPLERS
BLOWERS
COMMINUTION
COOLING
CRYOGENICS
DESIGN
ELEMENTS
EQUIPMENT
FILTERS
FLUID FLOW
GAS FLOW
LIQUID FLOW
MONITORING
NITROGEN
NONMETALS
PARTICLE SIZE
PARTICLE SIZE CLASSIFIERS
PARTICLES
PHASE TRANSFORMATIONS
POLLUTION
POROSITY
SAMPLERS
SIZE
VACUUM SYSTEMS