On Sun, Apr 22, 2012 at 10:07 PM, randy oliver <[log in to unmask]>
 wrote:

> Anyone have good data?
>


http://www.cdpr.ca.gov/docs/emon/pubs/fatememo/Imidclprdfate2.pdf
Environmental Fate of Imidacloprid
Revised by Matthew Fossen, Ph.D.
Environmental Monitoring
Department of Pesticide Regulation
1001 I Street
Sacramento, CA 95812–4015
April 2006
Summary

Despite these findings, there have been numerous detections of imidacloprid
in ground water. A ground water monitoring project conducted by Bayer
Corporation (1998) on Long Island, NY, detected imidacloprid in a single
agricultural well at concentrations ranging from less than 0.1 ppb to 1.0
ppb over a five month sampling period; the well was located in a sandy loam
soil with a water table at 18 feet. Ground water monitoring data submitted
to U.S. EPA by the New York State Department of Environmental Conservation,
Division of Solid and Hazardous Materials (U.S. Environmental Protection
Agency, 2003) contained several imidacloprid detections in agricultural,
homeowner, and golf course wells located in highly vulnerable soils.

Table 6. Summary of imidacloprid detections in ground water in New York.
Obtained from U.S. Environmental Protection Agency (2003).
Number of detections
≈20
Total number of sites
≈2000
Maximum concentration
6.69 ppb
Minimum concentration
0.1 ppb
Ground water EECs are presented in Table 7. It should be noted that
although the maximum detected concentration of imidacloprid in ground water
exceeds both the acute and chronic EECs, it is far below the relevant DWLOC
and therefore presents little risk of dietary exposure.
Table 7. Estimated environmental concentrations of imidacloprid in ground
water. Obtained from U.S. Environmental Protection Agency (2004).
Acute ground water exposure
2.09 ppb
Chronic ground water exposure
2.09 ppb



Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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