Live-blogged notes from a UW Water Seminar talk by Rick Keil’s student Brittany Kimball
Spicing Up the Sound: Cooking Spices and Aberrant Chemicals in Puget Sound and How They Get There
Sound Citizen collects water samples from around the region to understand the transport of common household chemicals from human sources into the marine environment. An added benefit is that the educational message is positive (e.g. associated with holiday cooking), in contrast to typical discouraging environmental news. With funding primarily from Washington Sea Grant, the undergraduate-driven project provides citizen scientists with kits for collecting water samples (about 40-75 kits returned per month since December 2008).
Analysis measures concentrations of: spices (27), solvents, perfumes, endocrine disruptors, and (soon) soaps and more.
Oregano — spikes in early May due to spring growth
Linalool — a scent from flowers (also common in household products) peaks naturally in June/July
Cinammon — can differentiate between cooked and metabolized (trans-cinnamic acid); based on 2007 data from treated sewage effluent peaks ~4 days after Thanksgiving (thyme also peaks 4 days after)
Vanillin — both natural and synthetic (ethyl vanillin, 4x more flavorful, so common in candy); peaks on memorial day, Christmas, Thanksgiving, Valentines day, 4th of July, Labor day; natural vanillin peaks during winter holidays (when real vanilla extract is used) while synthtic peaks during summer (possibly due to mass consumption of ice cream).
Chemicals in personal care products (e.g. musks, other fragrances…) and industrial products (e.g. insecticides, fertilizers) are detected about as commonly as spices in the samples. Lawn care chemicals peak in summer, while ibuprofen and estrogens peak in winter (a function of runoff and overflow from sewage treatment plants?).
With the new mass spectrometer, we can measure oleic acids (olive oil soaps), steric acids, and more…
Don’t miss our high school action projects on Feb 3-4. Student posters will be presented then at Mary Gates Hall.