In the Semi-Volatiles Analysis lab, scientists analyze samples for semi-volatile compounds such as pesticides and herbicides, and compounds found in plastics, shampoos and oils. The lab monitors about 200 compounds that are suspected to be harmful to health or the environment. The analysis helps determine how much pollution is going into regional waterways and identifies potential sources of these contaminants so they can be controlled.

In this lab:

• Semi-volatile compounds regulated by the Environmental Protection Agency and the Washington State Department of Ecology are identified, measured and reported.
• The gas chromatograph/mass spectrometer (GC/MS) is used to identify and measure the concentration of the materials being analyzed.
• Samples from different outfalls (discharge points) around the City are analyzed to determine pollution content and concentration, allowing for identification of pollution sources and development of source control solutions.

Did you know?

In 1983, the Environmental Protection Agency identified the Thea Foss and Wheeler-Osgood Waterways as problem areas in the Commencement Bay Superfund site. Phthalates, which are semi-volatile compounds, were identified among the contamination concerns. Phthalates are commonly used in building materials (vinyl flooring, shower curtains, etc.) and are believed to off-gas from these materials and then stick to fine particles in the air. As they settle out of the air, they are deposited on soils and impervious surfaces in the watershed. When it rains, the particles enter the storm drain system, which lead to streams and rivers eventually ending up in Puget Sound.