Concentration and Aquatic Toxicity of RIFA Insecticides and Other Organophosphates in Surface Water March 1999-June 2000 Dave Kim, Johanna Walters, Kean.

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Presentation transcript:

Concentration and Aquatic Toxicity of RIFA Insecticides and Other Organophosphates in Surface Water March 1999-June 2000 Dave Kim, Johanna Walters, Kean S. Goh August 29, 2000 Irvine, CA

Outline Introduction Monitoring Concentration vs toxicity Urban vs. Nurseries Irrigation Runoff vs. Storm Runoff Runoff mitigations Conclusions

The Insecticides Bifenthrin (Talstar®) Chlorpyrifos (Dursban®) Fenoxycarb (Award®) Hydramethylnon (Amdro®) Pyriproxyfen (Distance®) Diazinon

Aquatic Toxicity (LC50 ppb) ChemicalR. Trout D. magna C. dubia Bifenthrin na Chlorpyrifos Diazinon Fenoxycarb na Hydramethylnon na Malathion Pyriproxyfen>325400na

Newport Bay Watershed Bee Canyon (el Portola Pkwy Hines Channel (Hines) Marshburn Irvine Blvd San Diego Campus Dr. Bonita San Diego Ck Westcliff Park Channel

Irrigation Runoff

Storm Runoff

Mitigation

Application Runoff

Conclusions

Detections: Irrigation Runoff Single detect: hydramethylnon, pyriproxyfen Nursery: Bifenthrin, Diazinon, Chlorpyrifos, Malathion, Dimethoate <8 ppb Urban: Diazinon, Malathion, Chlorpyrifos <1.5 ppb

Detections: Storm Runoff Nursery –bifenthrin, diazinon, malathion, chlorpyrifos, fenoxycarb <6 ppb Urban –diazinon, malathion, chlorpyrifos <1.5 ppb

Toxicity: Irrigation Runoff Nursery sites: –18: Bifenthrin, Diazinon, Chlorpyrifos, Malathion –1 unknown –2 non toxic Urban and integrated sites: –27:Diazinon, Malathion, Chlorpyrifos –27 unknown –21 non toxic

Toxicity: Storm Runoff Nursery –All 18 samples 100% mortality Bifenthrin, Diazinon, Malathion, Chlorpyrifos Urban –All 18 samples 100% mortality Diazinon, Malathion, Chlorpyrifos Unknown

Prevention & Mitigation Insecticide Formulation & Application Irrigation Management Tailwater Recovery Buffer Strip

Acknowledgments California Dept of Food and Agriculture Center for Analytical Chemistry Department of Fish and Game UC Cooperative Extension County Dept of Agriculture Nurseries

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