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Scholars Day: April 7, 2010

Investigating the Diffusion of Trihalomethanes Though Polydimethylsiloxane Using Membrane Introduction Flame Ionization Detection

Chlorination, the most widely used method for disinfecting drinking water, is known to form undesirable halogenated byproducts. Some of the most common are trihalomethanes (THMs). Typical methods used for analysis of drinking water for THMs are expensive and time consuming, and often require organic solvents. Previous research resulted in the development of a membrane-based method for on-line monitoring of THMs in drinking water. While this approach was successful, it suffered from a low sampling rate. This research aims to improve on the previous work by optimizing the sampling device and experimental method. The membrane device was coupled directly to a flame ionization detector to investigate the effects of experimental parameters on diffusion. Membrane temperature, sample flow rate, carrier gas flow rate, sample ionic strength, and sample organic carbon content were investigated. Sorption studies were also performed. The experimental data was then correlated to a computational model to approximate diffusion rates.

Presenter: Ian Anderson (Undergraduate Student)
Topic: Chemistry
Location: 28 Hartwell
Time: 2:50 pm (Session IV)