New Nitrate Measurement Method

Summary By employing novel filtration methods, this semi-continuous ambient particulate nitrate monitor measures the concentration of particulate ammonium nitrate (NH4NO3) contained in PM2.5.

The device consists mainly of an inlet, filter, heater and detector. In 10-minute cycles, nitrates are collected with a PTFE membrane filter, subsequently volatilized via thermal desorption in a two zone heater, and finally, measured using chemiluminescent detection. The Limit of Detection is better than 0.5µg/m3, 8-minute sample.

Applications Compact (roughly 20 inches x 24 inches x 24 inches), and requiring only weekly filter changes and biweekly nitrogen cylinder changes, the device is well suited for use as an ambient particulate nitrate monitor. For Further Information Please Contact the Director of Business Development Alan Gordon Email: alan_gordon@harvard.edu Telephone: (617) 384-5000

Inventor(s): Allen, George A.

Type of Offer: Licensing



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