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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 on theme: "Concentration and Aquatic Toxicity of RIFA Insecticides and Other Organophosphates in Surface Water March 1999-June 2000 Dave Kim, Johanna Walters, Kean."— Presentation transcript:

1 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

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

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

4 Aquatic Toxicity (LC50 ppb) ChemicalR. Trout D. magna C. dubia Bifenthrin0.150.16na Chlorpyrifos31.70.13 Diazinon26000.960.51 Fenoxycarb 1600400na Hydramethylnon1601140na Malathion1701.81.14 Pyriproxyfen>325400na

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

7 Irrigation Runoff

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20 Storm Runoff

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25 Mitigation

26 Application Runoff

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32 Conclusions

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

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

35 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

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

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

38 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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