The purpose of this study was to address long term trends of organic contamination in the Newport Bay watershed in Southern California. Seven stations were sampled, two in Upper Newport Bay, two in Lower Newport Bay and three in the freshwater tributaries. Chemical analyses of sediment, bivalve, and fish tissue samples collected from 2006 to 2011 were examined for trends in concentration and compared to EPA Screening Values, Fish Contaminant Goals, and Advisory Tissue Levels for health risk assessment. These results provide evidence that banned chemicals such as PCBs and the pesticides chlordane, DDT, and dieldrin, and PBDE flame retardants are declining within the watershed. More data are needed before any conclusions can be made about the herbicide oxadiazon or the pyrethroid insecticides. Calculated biota-sediment accumulation factors were highest in total PCBs across all species and highest values for species were found primarily in California Halibut. Despite the declining trends in legacy contaminants, total DDT and total PCBs continued to exceed health risk parameters.
|Advisor:||Underwood, Dessie L. A.|
|Commitee:||Gosset, Rich, Johnson, Darren|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/03M(E), Masters Abstracts International|
|Subjects:||Biology, Toxicology, Surgery, Environmental science|
|Keywords:||Bioaccumulation, Contaminants of emerging concern, Contamination, Estuary, Legacy pesticides, Organic chemicals|
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