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B/Bu'S3naiS3y 3NOd3>l 



Figure 1. Computerized treatment of residue data from fathead minnows 

 exposed to 3.7 ng/1 of Kepone. Fish were continuously exposed for 

 56 days and placed in uncontaminated water for 28 days. 

 Parameter estimates: 



Time to reach 90% of steady state 43 days 

 Bioconcentration factor 15,053 



Time for 50% elimination 13 days 



53 



