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Vegetated agricultural drainage ditches for the mitigation of pyrethroid-associated runoff (2005).
| Content Provider | CiteSeerX |
|---|---|
| Author | Bennett, Erin R. Moore, Matthew T. Cooper, Charles M. Smith, Sammie Shields, F. Douglas Drouillard, Ken G. Schulz, Ralf |
| Abstract | Abstract—Drainage ditches are indispensable components of the agricultural production landscape. A benefit of these ditches is contaminant mitigation of agricultural storm runoff. This study determined bifenthrin and lambda-cyhalothrin (two pyrethroid insecticides) partitioning and retention in ditch water, sediment, and plant material as well as estimated necessary ditch length required for effective mitigation. A controlled-release runoff simulation was conducted on a 650-m vegetated drainage ditch in the Mississippi Delta, USA. Bifenthrin and lambda-cyhalothrin were released into the ditch in a water–sediment slurry. Samples of water, sediment, and plants were collected and analyzed for pyrethroid concentrations. Three hours following runoff initiation, inlet bifenthrin and lambda-cyhalothrin water concentrations ranged from 666 and 374 mg/L, respectively, to 7.24 and 5.23 mg/L at 200 m downstream. No chemical residues were detected at the 400-m sampling site. A similar trend was observed throughout the first 7 d of the study where water concentrations were elevated at the front end of the ditch (0–25 m) and greatly reduced by the 400-m sampling site. Regression formulas predicted that bifenthrin and lambda-cyhalothrin concentrations in ditch water were reduced to 0.1 % of the initial value within 280 m. Mass balance calculations determined that ditch plants were the major sink and/or sorption site responsible for the rapid aqueous pyrethroid dissipation. By incorporating vegetated drainage ditches into a watershed man- |
| File Format | |
| Publisher Date | 2005-01-01 |
| Access Restriction | Open |
| Subject Keyword | Vegetated Agricultural Drainage Ditch Pyrethroid-associated Runoff Ditch Water 400-m Sampling Site Ditch Plant Inlet Bifenthrin Pyrethroid Concentration Runoff Initiation Vegetated Drainage Ditch Necessary Ditch Length Abstract Drainage Ditch Mississippi Delta Agricultural Storm Runoff Similar Trend Effective Mitigation Contaminant Mitigation Regression Formula Indispensable Component Lambda-cyhalothrin Concentration Water Concentration Rapid Aqueous Pyrethroid Dissipation 650-m Vegetated Drainage Ditch Lambda-cyhalothrin Water Concentration Controlled-release Runoff Simulation Major Sink Sorption Site Watershed Man Front End Agricultural Production Landscape Initial Value Mass Balance Calculation Water Sediment Slurry Plant Material Chemical Residue |
| Content Type | Text |
