Microanalysis and Microscopy: Capabilities

Gravimetry

Determination of the mass concentration of airborne particulate matter is performed gravimetrically by weighing and reweighing specialized filters used to collect the samples. Sensitive microanalytical balances are used to record weight differences at the microgram level. Microgravimetry must be done carefully because particles, filters, and microbalances are sensitive to static charge and changes in temperature and humidity. We control static charge with ionizing electrodes and control temperature and humidity in the weighing environment with two dedicated walk-in weigh chambers. This allows us to perform both routine gravimetric determinations and special projects, such as acceptance testing of collection filter media.

Contact: Lisa C. Greene