Harvard College

Other

University of Massachusetts

Jack M Wolfson

Petros Koutrakis

Stephen T Ferguson

Constantinos Sioutas

Peng-Yau Wang

James McDevitt

Donald Milton

Ilias G Kavouras

Provided are devices and methods for the collection of bioaerosols (such as viruses, bacteria, and proteins) from the exhaled breath of humans and/or animals, for the purpose of determining, for example, particle size, generation rate, diseases and interventions for particle release.

Biological particle collector and method for collecting biological particles

The present disclosure relates to a method of collecting particles in a gas sample comprising impacting particles in the gas sample on a porous material, as well as to impactors wherein an inertial impactor includes a porous substrate.

Impaction substrate and methods of use

Methods and apparatus for the continuous monitoring of ambient particulate mass in a gas sample encompassing the monitoring of PM.sub.10, (particulate matter greater than 10 .mu.m) and coarse particles (2.5 to 10 .mu.m), the determination of the size distribution of particles, the determination of particle density and the determination of particle-bound water, utilizing such laboratory equipment as an inertial impactor, a virtual impactor, diffusion dryer(s), HEPA filter(s), particulate matter collector(s), and pressure transducer(s).

Methods and apparatus for continuous ambient particulate mass monitoring

A method for continuously measuring particulate nitrate in a gas sample, comprising the steps of passing the gas sample through an inertial impactor with a 50% cut off at 2.5 microns, removing ambient pollutant gases from the gas with diffusion denuders, passing the gas through a first path so as to contact the gas with a coated filter so as to convert particulate nitrate to nitric acid vapor or passing the gas through a second path so as to contact the gas with coated filters to trap particulate nitrate and ammonia, and measuring nitric acid vapor and residual ambient pollutant gases produced from the first path and residual ambient pollutant gases produced from the second path with a chemiluminescent monitor, the difference in the signal produced from the gases from the two paths being a measurement of the particulate nitrate in the gas sample.

Continuous measurement of particulate nitrate

Apparatus for measuring the amount of particulate matter in a gas having a gas supply, a first particulate matter collector downstream of the gas supply and in gaseous communication with the gas supply, and a second particulate matter collector downstream of the gas supply and in gaseous communication with the gas supply. Gas from the gas supply to the second particular matter collector is passed through a particle remover to remove particulate matter prior to contact of gas from the gas supply with the second particulate matter collector. A pressure sensor is provided to measure differential pressure between the first particulate matter collector and the second particulate matter collector, and at least one pump to cause gas to pass from the gas supply to the first particulate matter collector and the second particulate matter collector.

Method and apparatus to measure particulate matter in gas

A denuder for collection of gases, consisting of a plurality of generally parallel elongated tubes having a surface formed from an inert non-metallic material, said tubes being configured and arranged to allow recovery of gaseous material collected on each said surface.

Denuder for gas sampling

An ozone monitor including an ozone reactive surface, held within a container, which is adapted to specifically react with ozone. The surface is also adapted to fail to react with nitrogen dioxide in an amount which affects ozone quantitation by more than 20% when the nitrogen dioxide is provided at a concentration of 76 ppb and ozone is provided at a concentration of 30 ppb within a test gas.

Growing community of inventors

Jamaica Plain, MA, United States of America

Jack M Wolfson