Proposed here is a diagnostic method for the on-line, semi-continuous determination of the size and density (g/cm(3)) of individual particles in the 5 nm to 100 nm sizerange. this is accomplished through a double size spectrometry system. particles are first sized by their stokes diameter, and then… More

The concentrations of airborne particles in the upper atmosphere and stratosphere are measured by low-pressure condensation nucleus counters wherein particles are grown insize by condensation from a supersaturated vapor and countedoptically. current instruments are limited by the smallest particle… More

We will design a unique device that would clean and recirculate indoor air for the purpose of contrtuberculosis bacilli and other micro-organisms. The device would be based on the principle of particimpaction, a well-understood mechanism which is very effective for particles greater than 1… More

Automated Optical and Chemical Characterization of Fine Airborne Particles by Size DOE Grant No. DE-FG03-98ER86070 Amount: $100,000 Small Business Aerosol Dynamics, Inc. 2329 Fourth Street Berkeley, CA 94710-2401 Dr. Susanne Hering, Principal Investigator Dr. Susanne Hering, Business… More

70753 Energy production and combustion of fossil fuels are sources of organic aerosols that have been linked to environmental degradation, human health problems, and changes in the radiative transfer properties of earth¿s atmosphere. New techniques are needed for the time-resolved in-situ… More

70589 Time-resolved, quantitative measurements of particulate organic compounds, which contribute to atmospheric pollution, are needed to identify their direct and precursor sources. Carboxcylic acids are an important component of the organic fraction. This project will develop an automated… More

70753B02-II Energy production and the combustion of fossil fuels are sources of organic aerosols that have been linked to environmental degradation, human health problems, and changes in the radiative transfer properties of earth¿s atmosphere. New techniques are needed for the time-resolved… More

70753B02-II Energy production and the combustion of fossil fuels are sources of organic aerosols that have been linked to environmental degradation, human health problems, and changes in the radiative transfer properties of earth¿s atmosphere. New techniques are needed for the time-resolved… More

A compact, autonomous and rugged instrument to measure the concentration of inorganic ions, and possibly organic acids, in atmospheric aerosols is proposed. This instrument will combine an innovative method for particle concentration and collection with emerging ?laboratory on a chip? analytical… More

76023-Among the contributors to atmospheric pollution, carboxylic acids (including mono- and dicarboxylic acids, aliphatic ketoacids, and aromatic acids) are an important class of oxygenated, organic compounds in atmospheric aerosols. To better understand their sources and atmospheric… More

A compact and affordable, microchip-based system for the automated, in situ analysis of inorganic ions in atmospheric aerosols will be develop and verified against traditional, filter-based methods. Our approach combines tow new technologies: (1) a growth tube impactor for particle collection and… More

Concern for the potential health effects of inhaled particulates led to a federal standard governing coarse particles, or PM10, for particles below 10 ¿m and subsequently to a fine particle (PM2.5) standard in 1997, for particles below 2.5 ¿m. The U.S. Environmental Protection Agency (EPA)… More

A compact and affordable, microchip-based system for the automated, in situ analysis of inorganic ions in atmospheric aerosols will be develop and verified against traditional, filter-based methods. Our approach combines tow new technologies: (1) a growth tube impactor for particle collection and… More

78167S05 Airborne particles significantly influence the radiative budget of the earth's atmosphere through direct scattering and absorption of solar and thermal infrared radiation, and through modification of the earth's cloud cover. Important to these effects is the aerosol size distribution and… More

79160 Organic matter is a major constituent of airborne particles, comprising 20-50% of the PM2.5 mass in many regions; yet, its characterization is difficult. Especially important is the real-time characterization of organic matter at the molecular level. To better understand the effects of… More

Organic matter is a major constituent of airborne particles, comprising 20-50% of their mass. Identification of its components is critical for tracing sources, elucidating transformation and formation processes, assessing affects on human health, and assessing affects on global climate. Therefore,… More

DESCRIPTION (provided by applicant): A miniature "growth tube collector" will be developed to provide the concentrated collection of multiple, sequential airborne particle samples directly onto a "collection wafer". This instrument will encapsulate individual particles within micrometer-diameter… More

Detection systems for aeropathogens require the concentration of airborne particles from large volumes of air into small volumes of liquid. This proposal addresses this need through droplet encapsulation of airborne particles, with subsequent capture into a microliter-sized collection reservoir.… More

Detection systems for aeropathogens require the concentration of airborne particles from large volumes of air into small volumes of liquid. This proposal addresses this need through droplet encapsulation of airborne particles, with subsequent capture into a microliter-sized collection reservoir.… More

Semivolatile organic matter is pervasive in the atmosphere. Its effect on the radiation balance of the earth depends on how this material is partitioned between the vapor and particle phases. Yet, no currently available instrumentation provides simultaneous, quantitative measurement of… More

DESCRIPTION (provided by applicant): Our parent project aims to develop a small, lightweight, battery-powered collector suitable for time-resolved personal and micro-environmental monitoring of the chemical constituents of airborne particles. This revision submission aims to enhance that technology… More

Atmospheric aerosols influence the global radiation balance through direct scattering, and perhaps more importantly, through modification of the earth

Semi-volatile organic compounds play an important role in the atmosphere. These constituents are involved atmospheric transformation processes, and are an important source of secondary organic aerosols and may play a significant role in the formation of cloud condensation nuclei. Unanswered… More

Atmospheric aerosols influence the earths radiation balance through direct scattering and absorption of radiation, and through alteration in the formation, brightness and extent of clouds. The concentrations and size distribution of aerosols aloft is important to these effects. Needed is a method to… More

Secondary and oxygenated organic compounds play an important role in the atmosphere. These constituents are involved in atmospheric transformation processes, and may play a significant role in the formation of cloud condensation nuclei. Unanswered questions include the relative importance of… More

Atmospheric aerosols influence the earths radiation balance through direct scattering and absorption of radiation, and through alteration in the formation, brightness and extent of clouds. The concentrations and size distribution of aerosols aloft is important to these effects. Needed is a method to… More