Case Study Summary: Model Bifenthrin Concentration Prediction

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Model Bifenthrin Concentration Prediction
The prevalence of bifenthrin in urban Sacramento waters is most likely explained by their wide availability in for the control of ants. Although application amounts reported by professional applicators are not 100 percent correct and that of homeowners are not reported, data from the DPR PUR database indicates that bifenthrin is heavily applied by applicators in urban Sacramento. Additionally, these pyrethroids have a longer half-life than some of the other insecticides, so they may remain in sediments for longer periods of time. Generally, bifenthrin has an aerobic soil half-life of 96 days. In comparison, other pyrethroids have half-lives that range from 12 days for cyfluthrin to 40 days for permethrin. Bifenthrin is particularly stable in anaerobic environments, with a half-life of over 400 days (Laskowski, 2002). In a rare study that evaluated half-life of pyrethroids, bifenthrin had aerobic half-life ranging from 428 to 1950 days and an anaerobic half-life of 251–498 days (Gan et al., 2005). This study was triggered by lack of observed bifenthrin data in study area at FOL002 within the lower American River.
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Though the PUR database summarizes pesticide use market trends and is available to pesticide regulators and water-quality managers, use of the summarized PUR data can lead to incorrect generalizations given that it contains potentially erroneous entries that can cause substantial errors in watershed modeling. Collecting additional information on indoor versus outdoor application and aboveground versus belowground application also would be valuable. Such additions would significantly improve the utility of the PUR

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