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ESM222ps5_2008

ESM222ps5_2008 - Spring 2008 ESM 222 Fate and Transport of...

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Spring 2008 1 ESM 222 Fate and Transport of Pollutants Problem Set #5 Due: Monday 06/02/08 Fate of Pesticide in a River Zinc bis(dimethyldithiocarbamate) [(CH 3 ) 2 NSS] 2 2- Zn 2+ , known commonly as Ziram, is a pesticide used widely as a fungicide for fruits (e.g. apples, pears, almonds, apricots), to prevent rot from fungi. More than 2 million pounds of Ziram are used every year in the US in various formulations. It is quite toxic even at low concentrations. Consider the case of Ziram having traveled through surface runoff to a river. More information on Ziram is available at: http://www.epa.gov/oppsrrd1/reregistration/ziram/ You should browse through the first few pages of the Reregistration Eligibility Decision (RED) for Ziram PDF to get an idea of Ziram’s use and effects, and then scroll down to page 42 of the PDF (26 in their pagination) to get the fate and transport data. To understand how to interpret some of this data, read on a bit further down the PDF.
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