NWFSC Monster Seminar Jam: Dr. David Alvarez
This seminar is part of the Northwest Fisheries Science Center's Monster Seminar Jam series.
Dr. David Alvarez (USGS) is presenting a talk, "Comparison of passive sampling techniques to biotic sampling of organic contaminants along the California coast."
Passive sampling devices are frequently used as an abiotic sampler to mimic the potential bioaccumulation of contaminants into aquatic organisms. Sampler design, physicochemical properties of a chemical, and organism type all determine the potential accumulation of a chemical into a sample medium which impacts the applicability of a passive sampler as a surrogate for biota. A discussion of these factors along with items to be considered during study design will be presented. A case study comparing three passive sampling devices (polar organic chemical integrative samplers (POCIS), polyethylene devices (PEDs), and solid-phase microextraction (SPME)) to mussel (Mytilus spp.) tissues which were used to sample a diverse set of chemicals in the coastal waters of San Francisco Bay and the Southern California Bight in 2009-10 will be presented. Seventy-one chemicals (including fragrances, phosphate flame retardants, pharmaceuticals, PAHs, PCBs, PBDEs, and pesticides) were measured in at least 50% of the sites. Between 1 to 26 chemicals were detected in common between a passive sampler and mussel tissue. Details of this work have been previously published (https://doi.org/10.1016/j.marpolbul.2013.04.022).
Dr. Alvarez is the Chief of the Environmental Chemistry Branch at the USGS Columbia Environmental Research Center in Columbia, MO. His focus is on the development of innovative methodologies for passive sampler design and complex mixture analysis of various environmental matrices. His research focuses on the sampling and analysis of emerging and historic contaminants to determine the extent of contamination of water bodies using a combination of complex trace analytical chemistry and bioindicator assays to not only determine the presence of organic contaminants but the potential impact to aquatic organisms. As the inventor of the polar organic chemical integrative sampler (POCIS) and researcher on other types of passive sampling techniques, he is widely recognized as an expert in the field and serves on many international scientific committees regarding the use of these samplers.
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