115b Development of a Consumer-Friendly Indoor Air Monitoring Device

Karen C. Dannemiller, Division of Engineering, Brown University, 75 Waterman St., Box 5443, Providence, RI 02912

With Americans spending 90% of their time indoors and indoor air pollutants at levels up to 100 times greater than outdoor air levels, it is important to sample indoor air. These contaminants result in thousands of cancer deaths and hundreds of billions of dollars in economics costs each year. Several design aspects of an indoor air sampling device to detect volatile organic compounds (VOCs) are examined. Challenges to design include breakthrough volume considerations, pressure drop constraints, calibration, and determination of detection limits. To avoid exceeding the breakthrough volume, the sampling tube should contain 0.210 g of Tenax TA sorbent. It is recommended that the sampling device use a pump to achieve the desired flow rate as opposed to a fan due to the pressure drop of the packed bed. In determining the calibration curve and the detection limits, the detection of formaldehyde proved to be difficult and deserves further research.